The lost Deep Sky discoveries
with the Great Melbourne Telescope
When the 48-inch f/41 Great Melbourne Telescope (GMT) began service in 1869 it was by far the largest telescope in the Southern Hemisphere. With an innovative Cassegrain optical design, open lattice tube and equatorial mounting by father and son Irish telescope engineers Thomas and Howard Grubb, expectations were sky high for spectacular new discoveries.
Thirty-five years earlier John Herschel surveyed the southern skies with his 18.5-inch f/13 speculum reflector from the Cape of Good Hope in South Africa. Herschel produced a monumental catalogue with over 1700 southern nebulae and cluster, nearly 1300 of which were new, and a list of over 2000 double stars. Herschel also compiled an extensive catalogue of the stars, clusters and nebulae in the Magellanic Clouds and documented spectacular outbursts of Eta Carinae.
One of the primary missions of the GMT was to follow up on Herschel's sketches of nebulae and see whether changes could be documented in the structure of these mysterious objects. Unfortunately, there were issues with both the telescope and the observing program that significantly hindered the observatory's output and results.
The mirror started off with a "mealy" appearance as the wrong solvent was used to remove a shellac coating that was applied to protect the surface during transport and the eye-stops (baffles) for the supplied eyepieces were incorrectly removed. Even when these issues were rectified, the number of clear, transparent nights was limited and the massive speculum mirror tarnished quickly in the moist Melbourne weather. The observatory had difficulties in hiring a first-class astronomer to follow through on the observing program. But most importantly, the program itself, to detect changes in nebulae, was ill fated. Factors including variability in observing conditions and the subjective nature of recording and sketching details near the limit of visibility could not be controlled. And more importantly, the astronomers were unaware that the targeted objects (both emission nebulae and galaxies) were much too distant to display any physical changes over a human lifespan, so the project goals were doomed to inconclusive results.
Robert Ellery, the director of the observatory, published one major paper on the results: "Observations of the Southern Nebulae made with the Great Melbourne Telescope from 1869 to 1885. Part I. Melbourne". It included sketches and descriptions of many nebulae, but only two new (both insignificant) objects were mentioned. Despite the expectation to publish additional observations, the lack of both financial resources and an effective method to produce lithographs of the sketches squashed that goal. The last observations with the telescope were made around 1890. George Ritchey, the architect of the 60-inch and 100-inch Mt. Wilson reflectors, considered the GMT an abject failure and wrote it was "one of the greatest calamities in the history of instrumental astronomy; for by destroying confidence in the usefulness of great reflecting telescopes, it has hindered the development of this type of instrument for nearly a third of a century."
Nevertheless, the 48-inch telescope was in active service in Melbourne for 20 years. I've been curious for quite awhile if other unpublished discoveries were made with the telescope. Despite the limited program of reexamining objects discovered by John Herschel and looking for evidence of change, many new nebulae should have been picked up in the same field as well as many faint galaxies beyond Herschel's light grasp situated within rich southern galaxy clusters.
The October 2018 issue of Sky & Tel had a very interesting article by Trudy Bell on the restoration of the GMT by volunteers of the Astronomical Society of Victoria using surviving original parts. This got me thinking again about the paucity of new objects found with the GMT.
Bell's article mentioned that the Museums Victoria owned the GMT parts and I found a number of images of the observatory and lithographs of sketches that were prepared for publications including the first to reveal NGC 1365 as a barred spiral. This let me to scan the Annual reports of the Board of Visitors to the Observatory: together with the Annual Report of the Government Astronomer. The 20th report from 1885 stated, of the 172 nebulae observed, 140 are Herschels, 3 are new one discovered by the late Mr. Turner, and 29 new or not identified, found by Mr. Baracchi" and the 21st Report (1886) reported, 30 nebulae were found, but not identified in the catalogues, and may therefore be regarded as new. So, now I knew there were over 60 nebulae discovered with the GMT (59 by Mr. Baracchi) only two of which were credited in the NGC!
Starting in 1883, Pietro Baracchi was hired as the principal observer on the telescope. He spent the next year testing and improving the mechanical operation of the telescope to eliminate instrumental errors in determining positions. In 1884 he started the process of reexamining Herschel's nebulae and continued this work for the next 4 years, until April 1888.
After searching online I was able to locate scans of his original notebooks on the National Archives of Australia website and spend several days mesmerized by reading through Baracchi's logs, which documented dozens of his previously unknown discoveries! In some cases, he simply made careful diagrams, including the position of the nebulae with respect to nearby field stars. In other cases, he computed accurate positions (to within a few arc seconds) by timing offsets from known stars. As I originally suspected half of his discoveries are located in galaxy clusters; 17 in the Centaurus cluster, 6 in the Hydra I cluster and 6 in the Antlia cluster. It's unfortunate these discoveries were never published as they would have demonstrated the capabilities of this great telescope!
10 Dec 1884: S-L 92
11 Dec 1884: S-L 676 and S-L 684
18 Dec 1884: NGC 2043, NGC 2072 and OGLE-CL
LMC 632 (NGC 2059A)
NGC 2043 was sketched and logged four nights later as "a small elongated group of minute stars in a very thin nebula". His sketch clearly identifies NGC 2043 as a N-S string of stars (asterism) at 05 35 33.7 -70 07 27 (J2000), a couple of arc minutes south of his computed position.
NGC 2072 was labeled "g" on his sketch and called "vvF, S, indistinct, flat." With respect to NGC 2065, he measured an offset of 47 seconds following and 40" N. This falls only 0.6' NE of center of this small cluster.
Baracchis sketch also shows OGLE-CL LMC 632 (identified as NGC 2059A in SIMBAD) as a nebulous object close northwest of NGC 2059 and directly south of a star labeled as 15th magnitude. He called it vvF, E, indistinct, flat, elongated. Ellery mentioned this object in Observations but didnt include it with the two other New Nebulae.
10 Feb 1885: S-L 692
19-21 Mar 1885: NGC 4622A, 4650A, 4603A, 4603C,
ESO 322-075, ESO 322-047, ESO 323-023
On 19 March, NGC 4622A (labeled as number 2) was described as "pF; S; R; glbM; diam. 35 arcseconds." His sketch of 6 nearby stars is a perfect match, though he apparently missed the fainter member of this double system. NGC 4650A (labeled 4), a spectacular polar ring galaxy, was logged as "vF; S; R; glbM." His sketch included four nearby stars that were accurately placed to the east. He called ESO 322-075 (labeled 5) "pB; S; R; gbM" and his sketch, as well as computed position, is an excellent match.
The next night he confirmed three additional galaxies with offsets measured from HD 110090 (a wide pair). NGC 4603A was called "F; S; R; diam 30"; vlbM, ESO 322-047 as "cF, vS, R, vlbM" and NGC 4603C as "pB; S; E; pmbM; 165°, 50" long and 15" broad". The first two galaxies were also sketched with respect to HD 110090.
He re-examined the field on the 21st of March to confirm the previous observations and picked up ESO 323-023. It was labeled "7" and timed at 3 min 2 sec following 6.9-magnitude HD 111403 and 4' north. His final constructed sketch shows 10 galaxies (the 7 described here and 3 previous discoveries by Herschel), along with one suspected nebula, which is a faint double star. His table includes very precise positions for all his discoveries.
9 Apr 1885: ESO 499-023
12 May 1885: ESO 322-102, 323-005, 323-008,
323-009, 323-019 and MCG -07-26-057,
ESO 323-005 was called "pB; vS; R; pspmbM; 25" diameter." His sketch (labeled B) also includes ESO 323-008 (labeled C) and ESO 323-009 (labeled C'). ESO 323-008 was noted as "pF; S; R; vlbM; about 30" diameter. It is a little fainter than B." and ESO 323-009 as "eF; eS; [like a] small deformed star."
MCG -07-26-057, a close companion of NGC 4709, was labeled D' and described as "vvF; eS; R". He measured an offset of 3 seconds following NGC 4709 (labeled D) and 35" south. ESO 323-019 (labeled F) was noted as "pB; S; roundish; vlbM." He made field diagrams of all 6 new objects (as well as NGC 4677, 4706, 4709, 4743) that confirm the discoveries.
4 Jul 1885: ESO 322-099, ESO 322-100, NGC
Finally, he found NGC 4696A and NGC 4677 preceding NGC 4683. He placed NGC 4696A 45 seconds of RA west and 1' 50" north of NGC 4683. His field sketch confirms the identifications although he misidentified NGC 4677 (labeled O) as a new object. These last discoveries brought Baracchi's total to 17 galaxies discovered in the Centaurus cluster!
3 Sep 1885: IC 4982 and IC 4985
3 Oct 1885: NGC 6438A
5 Oct 1885: 2MASX J20095889-4821262
ESO 233-035: After describing NGC 6870 he wrote, "A very faint, very small flat nebulous patch precedes [NGC 6870] by 46 seconds and is 20" north of it. Called A in diagram." His small sketch shows 4 stars surrounding this object, including a mag 12 star 3' SSE, and perfectly matches the field of ESO 233-035.
NGC 6861D: Baracchi next logged NGC 6861D as "another pF, very small, pmbM, roundish. Precedes [NGC 6870] by 111 seconds and is 4' 45" north of it. Called B." His diagram includes a nearby mag 10.5 star and two 15th mag stars, clinching the identification.
IC 4943 and 2MASX J20062917-4819434: Baracchi wrote these "two objects called D and C are both in the same declination and precede [NGC 6861] by 52 seconds and D is 40" south of [NGC 6861] and C is 3' 40" north of [NGC 6861]. C [= 2MASX ] is extremely faint, very very small, like a nebulous indistinct little patch. D [= IC 4943] is a little brighter than C but still pretty faint. It is very small, and gradually pmbM. Looks like a diffused faint nebulous star." His sketch, which includes a nearby mag 10.3 star along with several additional fainter stars, perfectly matches the field of these two galaxies.
2 Nov 1885: MCG -07-47-031
8 Nov 1885: LEDA 2802343
He described NGC 6812 as "Rather faint, small, pmbM. The center sparkling at times as if a star was in it." The last comment possibly refers to LEDA 2802344, which is attached on the southwest part of the halo, but there is no confirmation of this on his diagram.
5 Dec 1885: MCG -05-04-018, MCG -05-04-013
and LEDA 132859
7 Dec 1885: IC 285
11 Dec 1885: ESO 297-012, LEDA 131053, LEDA
Later the same night, he examined the field of NGC 1600 and picked up four objects, which he assumed were NGC 1600, 1601, 1603 and 1606. The nebula labeled "D" was described as "the fourth of group, faintest of all. Undefined irregular patch, small, very very little brighter middle. This follows A [NGC 1600] by 31 seconds and is 3' S of it." He assumed this object was NGC 1606, but his offsets point directly to LEDA 177545.
3-4 Jan 1886: S-L 556 = Hodge 4
28 Jan 1886: ESO 375-041 and LEDA 83082
3 Feb 1886: ESO 501-049, PGC 31444, PGC 31450,
PGC 31476 and LEDA 141475
He described the five new objects as follows: ESO 501-049 ("vvF, vS, R, gbM"), PGC 31444 ("eeF, S, R, uncertain"), PGC 31450 ("vvF, vS, flat, roundish"), PGC 31476 ("vvF, vS, R, *12 p"), LEDA 141475 ("eeF, a minute nebulous star"). He reexamined the cluster on 8 February and confirmed the new objects.
8 Feb 1886: IC 2584, NGC 3258B and LEDA 83097
He then moved about 40' further south and recorded NGC 3257, 3258, 3260 and 3273. In addition he discovered NGC 3258B and LEDA 83097. He described NGC 3258B (object "Q") as "vvF, small, flat, indistinct contour" and placed it 2' 20" north of NGC 3258 and 92 seconds of RA following. LEDA 83097 (a surprisingly faint galaxy labeled with a question mark) was described as "eeF, small, uncertain." His offset was 20" south of NGC 3258 and 52 seconds of RA following.
28 Feb 1886: NGC 3258D
10 Mar 1886: PGC 31418
7/8 Dec 1887: ESO 194-013
While observing the NGC 87/88/89/92 quartet he noticed a nebula described as "pF; pL; R; flat; about 35" diameter; ill defined. It follows GC 46 [NGC 92] by 68s and is 2' 40" north of it. This nebula is not in the General Catalog. Probably new." The sighting was confirmed the following night and he estimated a diameter of 40".
16/17 Dec 1887: Bruck 67, Kron 25 and Henize
In addition he picked up three new objects. Bruck 67 (00h 52m 48.4s -73° 24' 41") was labeled as object "M" and described as "eeF; pL; R; vlbM". His offset was 18 seconds of RA preceding and 2' S of NGC 294.
Kron 25 (00h 48m 02s -73° 29' 12") was labeled as object "K" and called "eeF; S; irr; roundish - ill defined." His offset with respect to the position of NGC 269 was 21 seconds of time and +2' 40" in declination.
Finally, Henize SMC-N45 was found "90 seconds preceding object "N" [NGC 294] and 9' north of it." His description reads " a small group of minute stars involved in very faint nebulosity. This is probably [GC 166 = NGC 294]." The last statement is incorrect as object "N" in his list clearly refers to NGC 294. He was perhaps confused as its RA is 1 minute too small in the GC.
14 Feb 1888: ESO 358-059
In April 1888 all observations ceased with the GMT and re-polishing experiments commenced. Baracchi finally succeeded in getting a good figure and polish on Mirror A and it was replaced in the telescope in 1890. But only a limited number of scattered observations were made subsequently; Eta Car was observed a few times, along with a few nebulae and comets, but there were no new discoveries.
In additional to these 59 objects (57 uncredited), Baracchi also recorded the following objects:
4 Dec 1885: Two HII knots in NGC 1313
5 Dec 1885: MCG -05-04-01
24 Jun 1884: Hodge 301 in NGC 2070
Data and visual observations
ESO 194-013 = PGC 1452
30" (11/4/10 - OzSky, 429x): picked up while viewing the compact Phoenix Quartet located ~12' WSW and part of the same group. At 429x, appeared moderately bright, moderately large, elongated 4:3 SW-NE, 0.9'x0.7', broad concentration with a slightly brighter core but no distinct zones. A distinctive string of three mag 13 stars [length 1.4'] is centered 2' E.
Kron 25 = Lindsay 35 = OGLE-CL SMC 4
SMC-N45 = OGLE-CL SMC 72
25" (10/17/17 - OzSky): at 397x; bright, moderately large, irregular or triangular in shape, 35"-40" diameter. Several very faint stars are superimposed or at the edges of the glow including a couple of mag 15 stars at the south edge and a couple of mag 15.5 stars at the east edge. Two mag 13/14 stars are 0.8' SE. Located 4.5' SE of NGC 290 in the central part of the SMC.
18" (7/10/05 - Magellan Observatory): picked up while viewing NGC 290 at 228x. This SMC HII region (and cluster) appeared as a faint, elongated patch with a few faint stars resolved around the edges (part of Hodge Association 26). I didn't try blinking with a UHC filter.
Bruck 67 = DEM S 73
25" (10/17/17 - OzSky): at 244x and 397x; faint, fairly small, irregular low surface brightness patch, 35" diameter. Located just 2.2' SSW of much brighter NGC 294.
30" (11/6/10 - OzSky, 264x): picked up 2.2' SSW of NGC 294. This cluster appeared as slightly smaller, irregular glow with a low even surface brightness.
MCG -05-04-012 = PGC 4413
24" (9/15/12): extremely faint, very small, round, 18" diameter. In a small trio of faint galaxies 5' SW of NGC 439 within ACO S141. MCG -05-04-013 is 1.1' NE and MCG -05-04-011 is 1.4' N.
MCG -05-04-013 = PGC 4412
24" (9/15/12): very faint, very small, round, 18" diameter. In a small trio of faint galaxies 5' SW of NGC 439 within ACO S141. Partially due to the low elevation and only fair seeing, it was very difficult only one or two galaxies could be glimpsed at a time, though this one was slightly easier.
LEDA 132859 = 2MASX J01134317-3150350
24" (9/15/12): fourth brightest member in the cluster ACO S141 = SCG 1 = Klemola 1. Appeared faint, small, oval 4:3 ~E-W, ~0.4'x0.3', even surface brightness. Located 3.7' SW of NGC 441.
MCG -05-04-018 = PGC 4452
24" (9/15/12): third brightest member in the cluster ACO S141 = Klemola 1. Appeared fairly faint, fairly small, oval 3:2 E-W, 24"x16". Located 7' SE of NGC 439, the brightest in the group.
LEDA 131053 = 2MASX J01343865-3721133
ESO 297-012 = MCG -06-04-057 = PGC 5959
IC 285 = MCG -02-08-044 = PGC 11557
24" (12/6/18): at 375x; nearly fairly faint, fairly small, elongated at least 2:1 NW-SE, low even surface brightness, ~40"x18". Located 3.2' SE of NGC 1200 in a distinctive quartet. The major axis of the galaxy points to the center of NGC 1200.
ESO 358-059 = MCG -06-09-026 = PGC 13753
S-L 92 = KMHK 240
Hodge 4 = S-L 556 = ESO 086-009
N-S string of stars (asterism)
OGLE-CL LMC 632
24" (4/10/08 - Magellan Observatory): I confirmed there was a cluster in the position I plotted just off the edge of the Mati Morel Atlas. At 260x it appeared faint, small, 20"-25" diameter and seems mottled like a group of stars (on the DSS this is a small incomplete ring of stars). There is a single star just off the (SE) edge. This chain of stars is misidentified as NGC 2059 on the Hodge-Wright Atlas.
24" (4/9/08 - Magellan Observatory): at 260x, this unidentified cluster appeared fairly faint, fairly small, round, 25" diameter. A very faint star is at the edge. Located 1.5' NW of NGC 2059 and 3.5' N of NGC 2058). It forms the northern vertex of a near equilateral triangle with two mag 12 stars ~1.5' SSE and SW.
Hodge 301 = H88 301
18" (7/8/02 - Magellan Observatory): this compact cluster is situated just 3' NW of the central cluster (R136) of the Tarantula Nebula. It appeared as a 30" knot with a half-dozen mag 13-14 stars resolved over haze.
NGC 2072 = ESO 057-004 = S-L 630
LMC OC; V = 13.2; Size 1.0'
24" (4/10/08 - Magellan Observatory): at 260x this LMC cluster appeared moderately bright, fairly small, round, 35"-40" diameter, weak concentration. Located 4' E of NGC 2065 at the east end of a group of 8 NGC clusters (and a couple of fainter ones).
30" (10/13/15 - OzSky): at 394x; moderately bright and large, round, 35" diameter, smooth glow with no resolution. S-L 684 is 2.4' ENE. Picked up 4.1' NNW of NGC 2107.
30" (10/13/15 - OzSky): at 394x; fairly faint to moderately bright, smooth glow, 25" diameter, roundish, no resolution. Brighter S-L 676 lies 2.4' WSW. Picked up 5' NNE of NGC 2107.
30" (10/13/15 - OzSky): at 394x; fairly faint, fairly small, slightly elongated glow, 35" diameter, no resolution. S-L 692 is the southern of close pair of LMC clusters with S-L 691 just 48" N. Located 5.4' ESE of NGC 2107.
ESO 499-023 = MCG -04-24-007 = PGC 28690
ESO 375-041 = MCG -06-23-035 = PGC 30905
IC 2584 = ESO 375-043 = MCG -06-23-037 = PGC
NGC 3258B = LEDA 83128
NGC 3258D = ESO 375-058 = MCG -06-23-051 =
17.5" (3/28/87): fairly faint, fairly large, diffuse. A star is at the west edge. Located 18' ESE of NGC 3271 in the Antlia Cluster.
PGC 31418 = PGC 31419
48" (4/21/17): at 488x; fairly faint, fairly small, elongated 4:3 NW-SE, ~18"x14", small bright nucleus. Located 2.5' NW of NGC 3309 in AGC 1060. First in a quartet of relatively faint and small galaxies just north of NGC 3309/3311 in the Hydra I cluster (Abell 1060) with PGC 31464 1.3' ENE.
48" (4/21/17): at 488x; fairly faint, fairly small, elongated 5:2 or 3:1 NW-SE, ~25"x9". Located 2' S of NGC 3311 in AGC 1060 and fairly close east [32"] of a mag 11 star. A mag 15.8 is squeezed between this galaxy and the mag 11 star [15" W of center].
ESO 501-049 = AM 1035-271A = PGC 31542
48" (4/21/17): at 488x; moderately bright, fairly small, elongated 5:2 ~N-S, ~50"x20", contains a small bright core and stellar nucleus. Situated 3.9' due east of NGC 3312. AM 1035-271A NED02, a disrupted pair or ring galaxy, is 1' NE. Due to an extremely low surface brightness, it required averted to glimpse.
24" (3/28/17): faint to fairly faint, very small, slightly elongated N-S, 15"x10", faint stellar nucleus. Located 3.9' E of NGC 3312 in the core of AGC 1060. A mag 10.8 star is 1.5' SW and several fainter stars are nearby. I'm surprised I noticed this galaxy through my 18" in 2005.
18" (4/9/05): this extremely faint member of AGC 1060 was just glimpsed a few times and sketched while observing other brighter members of the cluster. Checking the DSS, showed this galaxy exactly where I had placed it with respect to a trio of stars to the SW. Located 4' E of NGC 3312 in the core of AGC 1060.
NGC 4603A = ESO 322-044 = MCG -07-26-020 =
17.5" (4/7/89): very faint, elongated E-W. Located 4.7' W of a bright unequal double star mag 9/13 at 23". Member of the Centaurus cluster (Abell 3526).
ESO 322-047 = MCG -07-26-023 = PGC 42441
NGC 4603C = ESO 322-049 = MCG -07-26-025 =
NGC 4622A = ESO 322-64 = MCG -07-26-035/036
= VV 580 = PGC 42845
17.5" (4/7/89): very faint, very small, round. Two mag 13 stars at 50" separation oriented E-W follow (the closest is 1.2' SE of center). Forms a pair with NGC 4650 5.8' ESE. This is a double galaxy (with NGC 4622B) and a member of the Centaurus cluster (AGC 3526).
NGC 4650A = ESO 322-069 = AM 1242-402 = PGC
48" (4/21/17): at 488x; nearly moderately bright, fairly small, oval 4:3 or 3:2 WSW-ESE, small brighter core. The polar ring extensions were extremely faint and difficult, though viewed in windy conditions.
48" (5/15/12): moderately bright, fairly small, oval 3:2 WSW-ESE, 24"x16". The polar ring was occasionally visible as faint, thin extensions oriented NNW-SSE. Need to reobserve as viewed through thin clouds.
24" (4/12/08 - Magellan Observatory): this is a classic polar-ring galaxy in Centaurus cluster AGC 3526 (one of about a 100 known), located 5.6' ENE of NGC 4650. The polar-ring is the result of the collision and merger of two galaxies at least 1 billion years ago. At 200x, it appeared fairly faint, fairly small, elongated 3:2 WSW-ENW, 30"x20". The surrounding "polar-ring" was not recorded.
ESO 322-075 = MCG -07-26-042 = PGC 43087
NGC 4696A = ESO 322-077 = MCG -07-26-043 =
18" (7/7/05 - Magellan Observatory): faint, fairly small, elongated 5:2 N-S. Appears like a low surface brightness version of NGC 4677, which was viewed immediately before. Located 5.1' N of NGC 4677 and 9' WNW of NGC 4683 in the core of the Centaurus Cluster (AGC 3526).
ESO 322-099 = PGC 43354
18" (7/7/05 - Magellan Observatory): fairly faint, very small, round, only 20" diameter but has a fairly high surface brightness. Paired with ESO 322-100 just 1.5' N. A mag 10.3 star lies 3.2' SW. Located 13' SE of NGC 4696 in the core of the Centaurus Cluster (AGC 3526).
ESO 322-100 = PGC 43355
18" (7/7/05 - Magellan Observatory): faint, very small, round, 20" diameter and weak concentration. A mag 14.5-15 star is close following. With averted vision the core has faint extensions E-W roughly in the direction of faint star increasing the overall size to 30"x20". Forms a close pair with ESO 322-99 just 1.5' S. Located 11' SE of NGC 4696 and 8.5' SW of NGC 4709 in the core of the Centaurus Cluster (AGC 3526).
ESO 322-102 = MCG -07-26-054 = PGC 43374
18" (7/7/05 - Magellan Observatory): faint, fairly small, very elongated 3:1 SW-NE, 0.6'x0.2', very weak concentration. Located 5' W of NGC 4709 and 10' SE of NGC 4696 in the core of the Centaurus Cluster (AGC 3526).
MCG -07-26-057 = PGC 43427
ESO 323-005 = MCG -07-26-058 = PGC 43435
18" (7/7/05 - Magellan Observatory): fairly faint, very small, oval 3:2 N-S, 0.4'x0.25', fairly high surface brightness. A mag 13 star lies 0.9' SW of center. Located 8' S of NGC 4709 and 20' SE of NGC 4696 in the core of the Centaurus Cluster (AGC 3526). Two galaxies, ESO 323-008 and 323-009 lie 5' and 7.5' NE, respectively.
ESO 323-008 = PGC 43466
18" (7/7/05 - Magellan Observatory): faint, small, elongated 2:1 NW-SE, 0.5'x0.25', weak or no concentration. A mag 10.8 star lies 2.3' NE. Second of three in a chain with ESO 323-005 5' SW and ESO 323-009 2.8' NNE. Located 8' SE of NGC 4709 and 22' SE of NGC 4696 in the core of the Centaurus Cluster (AGC 3526).
ESO 323-009 = PGC 43479
18" (7/7/05 - Magellan Observatory): very faint, very small, slightly elongated E-W, 0.4'x0.3'. Located 1' N of a mag 10.8 star that forms a wide, unequal pair with a mag 14 star at 18" separation. ESO 323-008 lies 2.8' SW. Located 8' SE of NGC 4709 and 22' SE of NGC 4696 (on a line with both galaxies) in the core of the Centaurus Cluster.
ESO 323-019 = MCG -07-27-004 = PGC 43623
ESO 323-023 = MCG -07-27-007 = PGC 43677
NGC 6438A = ESO 010-001 = VV 682 = PGC 61793
24" (4/11/08 - Magellan Observatory): this is the eastern component of an disrupted, interacting system with NGC 6438. At 260x it appeared as a faint, diffuse, elongated SW-NE glow attached on the east side of NGC 6438, ~0.8'x0.5'. The DSS reveals two disturbed arms (possibly separate galaxies), though I didn't distinguish these separately. A mag 9.5 star lies 4' SW.
25" (4/5/16 - OzSky, 318x): LEDA 2802343 is the second brightest of two faint companions to NGC 6812 and was seen without difficulty just 1.8' WNW. It appeared very faint and small, round, ~12" diameter.
IC 4943 = ESO 233-028 = PGC 64102
18" (7/10/02 - Magellan Observatory): At 128x, this member of the Telescopium Group = ACO S851 appeared faint, small, round, 25" diameter. A mag 12.8 star lies 0.9' N of center. Located 8.5' W of NGC 6861 (second brightest of four in field). Forms the southern vertex of a triangle with an extremely faint anonymous galaxy (2MASX J20062917-4819434) 2.8' N and a mag 10 star 3.8' NE.
2MASX J20062917-4819434 = LEDA 3917583
18" (7/10/02 - Magellan Observatory): At 128x, while viewing the field of NGC 6861 in the Telescopium Group = ACO S851, I picked up a very small anonymous galaxy just 2.8' N of IC 4943. It appeared extremely faint, round, perhaps 20" diameter and formed the northern vertex of a triangle with IC 4943 2.8' S and a mag 10.3 star 3.4' ESE.
NGC 6861D = ESO 233-034 = PGC 64153
30" (10/18/17 - OzSky): at 264x and 429x; fairly bright, fairly large, very elongated 3:1 NNW-SSE, ~1.6'x0.5', strong concentration with a very bright elongated core and a stellar nucleus. A mag 10.4 star is 1.2' W. NGC 6861 lies 13.5' SW and NGC 6868 is 18.5' SE.
ESO 233-035 = PGC 64179
18" (7/10/02 - Magellan Observatory): this member of the Telescopium Group was fairly faint, small, elongated NW-SE, 0.5'x0.3' with a small bright core. Forms the NW vertex of a near equilateral triangle with NGC 6868 7' SE and NGC 6870 7.5' E within the central core of the Telescopium Group. A mag 10.6 star lies 6' W.
2MASX J20095889-4821262 = LEDA 3918606
30" (10/18/17 - OzSky): at 429x; fairly faint to moderately bright, round, 20" diameter, weak concentration, with a fairly high surface brightness. This galaxy is just off the northeast edge of NGC 6868 [1.6' from center], the dominant galaxy at the core of the Telescopium Group.
IC 4982 = ESO 073-039 = PGC 64498
30" (10/18/17 - OzSky): at 429x; faint to fairly faint, slightly elongated SW-NE, 20"x15". A close (interacting) companion (LEDA 270900) off the south edge was not noticed. Slightly fainter of a pair with IC 4985 2.3' NE.
IC 4985 = ESO 073-040 = PGC 64505
30" (10/18/17 - OzSky): at 429x; fairly faint, fairly small, round, broad concentration. Slightly brighter of a pair with IC 4982 2.3' SW. Member of the Pavo-I Group.
MCG -07-47-031 = PGC 71043