Discoveries 301 - 350
Suspected deep sky objects that are, to the best of my knowledge, unknown and undesignated. Most of these were stumbled upon on DSS images while compiling CSOG observing guides. A few asterisms, possibly open clusters and a single galaxy were seen during observing runs.
Before posting, I check multiple images (DSS, SDSS, DECaLS) to rule out artefacts. Once an object is determined to be real I check SIMBAD, NED, HyperLeda (for suspected galaxies), possible planetary nebulae, historical catalogs (for nebulae) and every available catalog in AstroPlanner.
The majority of these objects were reported on the Deep Sky Hunters group.
Whenever it is brought to my attention that an object that I suspected to be unknown / uncataloged / undesignated was indeed recognized before, I will remove it from my list and update the numbering accordingly.
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1-50 - 51-100 - 101-150 - 151-200 - 201-250 - 251-300 - 351 and further
301
R.A. / Dec. - Constellation
20:29:20.4 +36°27'17.0" - Cygnus
Suspected nature of object
Reflection nebula
Description
Nebulosity surrounding the mag. 5.9 A0 star 42 Cygni; most prominent in an east to west elongated, filamentary part to the south of the star that on the western side loops back towards the east (via the south) and that is approximately 8' in length.
Date, plate or visually
17 March 2024, plate
20' DSS POSS2 Blue
20' DSS POSS1 Blue
20' PanSTARRS
302
R.A. / Dec. - Constellation
08:46:18 -42°01'30" - Vela
Suspected nature of object
Nebula? Supernova remnant?
Description
Irregular shards of nebulosity surrounding the mag. 9.6 B9 star SAO220246, covering approximately 8'. A prominent, irregular, twisted part of nebulosity is 2' to the southeast of the star.
8' South of the open cluster NGC2671.
Date, plate or visually
23 March 2024, plate
15' DECaPS DR2
15' DSS POSS2 Red
15' DSS POSS2 Blue
303
R.A. / Dec. - Constellation
13:25:23.0 +55°00'04.6" - Ursa Major
Suspected nature of object
Galaxy
Description
A small, east-west elongated galaxy 95" east-northeast of the mag. 4.0 star "Alcor" (80 Ursae Majoris).
Date, plate or visually
27 April 2024, plate
5' POSS2 Blue
5' SDSS
304
R.A. / Dec. - Constellation
18:49:23.7 -03°02'36.6" - Aquila
Suspected nature of object
Nebula
Description
Irregular nebulosity surrounding the mag. 9.1 K0 star SAO142658
Date, plate or visually
10 May 2024, plate
10' POSS2 Blue
10' POSS2 Red
10' PanSTARSS
305
R.A. / Dec. - Constellation
18:33:25.1 -05°04'23.3" - Scutum
Suspected nature of object
Reflection nebula
Description
Faint nebula directly south of the mag. 13.5 star 4UCAC425-081292
Date, plate or visually
10 May 2024, plate
10' POSS2 Blue
10' PanSTARSS
306
R.A. / Dec. - Constellation
18:40:45.2 +01°02'16.0" - Serpens (Cauda)
Suspected nature of object
Reflection nebula
Description
Faint nebula directly south of the mag. 13.5 star 4UCAC425-081292
Date, plate or visually
10 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
307
R.A. / Dec. - Constellation
19:20:21.4 +09°46'00.0" - Aquila
Suspected nature of object
Reflection nebula
Description
An arc, perhaps multiple arcs of nebulosity west and northwest of the mag. 8.4 K0 star SAO124524
Date, plate or visually
10 May 2024, plate
15' POSS2 Blue
15' POSS2 Red
15' PanSTARRS
308
R.A. / Dec. - Constellation
19:21:17.2 +12°13'08.8" - Aquila
Suspected nature of object
Reflection nebula
Description
A north-south elongated nebula east of the mag. 11.8 star TYC1050-00511-1
Date, plate or visually
10 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
309
R.A. / Dec. - Constellation
19:17:43.4 +11°01'50.7" - Aquila
Suspected nature of object
Reflection nebula
Description
A north-south elongated nebula east of the mag. 9.0 A2 star SAO104687
Date, plate or visually
10 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
310
R.A. / Dec. - Constellation
19:18:29.6 +07°43'08.6" - Aquila
Suspected nature of object
Reflection nebula
Description
An east-west elongated nebula surrounding the mag. 11.5 star TYC1042-02660-1
Date, plate or visually
10 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
311
R.A. / Dec. - Constellation
19:08:14.8 +05°58'39.4" - Aquila
Suspected nature of object
Reflection nebula
Description
Faint nebulosity surrounding the mag. 11.3 star TYC0475-00310-1
Date, plate or visually
10 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
312
R.A. / Dec. - Constellation
18:17:30.8 -17°13'05.0" - Sagittarius
Suspected nature of object
Emission nebula
Description
A relatively large and bright, irregular nebula. On the northwestern edge is the mag. 11.8 star 4UCAC364-124985.
Date, plate or visually
10 May 2024, plate
10' POSS2 Red
10' POSS1 Red
10' PanSTARRS
313
R.A. / Dec. - Constellation
18:33:00.5 +03°58'00.0" - Serpens (Cauda)
Suspected nature of object
Reflection nebula
Description
North-south elongated, curving lanes of nebulosity west-northwest of the mag. 7.4 K2 star SAO123625
Date, plate or visually
10 May 2024, plate
10' POSS2 Blue
10' PanSTARRS
314
R.A. / Dec. - Constellation
19:07:43.5 +01°47'05.9" - Aquila
Suspected nature of object
Reflection nebula or planetary nebula
Description
A faint, round nebula, approximately 2.5' in size, with the mag. 8.4 A2 star SAO124300 on the eastern edge.
Date, plate or visually
13 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
315
R.A. / Dec. - Constellation
19:02:53.7 +05°20'33.5" - Aquila
Suspected nature of object
Reflection nebula
Description
Irregular nebulosity surrounding the mag. 8.3 A2 star SAO124193.
Date, plate or visually
14 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
316
R.A. / Dec. - Constellation
19:16:33.8 +06°34'11.0" - Aquila
Suspected nature of object
Reflection nebula
Description
A small and thin, east-west elongated nebula southwest of the mag. 6.5 A2 star SAO124457. 28" West of the planetary nebula NGC6781, the "Snowglobe Nebula".
Date, plate or visually
14 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
317
R.A. / Dec. - Constellation
17:25:59.4 -06°34'53.4" - Ophiuchius
Suspected nature of object
Reflection nebula
Description
A southwest-northeast elongated nebula surrounding the mag. 6.9 B9 star SAO141660.
Date, plate or visually
19 May 2024, plate
15' POSS2 Blue
15' POSS1 Blue
318
R.A. / Dec. - Constellation
17:56:15.0 -04°34'35.3" - Ophiuchius
Suspected nature of object
Reflection nebula
Description
A small and faint, elongated nebula southwest of the mag. 7.3 B9 star SAO141968.
Date, plate or visually
19 May 2024, plate
10' POSS2 Blue
10' POSS1 Blue
319
R.A. / Dec. - Constellation
20:11:55.4 +36°53'57.7" - Cygnus
Suspected nature of object
Nebula
Description
An irregular nebula surrounding the mag. 11.8 star TYC2683-03341-1, approximately 2.5'×1.5' in size.
Date, plate or visually
20 May 2024, plate
10' POSS2 Blue
10' POSS2 Red
10' PanSTARRS
320
R.A. / Dec. - Constellation
20:15:20.3 +55°45'07.3" - Cygnus
Suspected nature of object
Reflection nebula
Description
A northwest-southeast elongated nebula to the northeast of the mag. 9.7 star TYC3941-01537-1, approximately 3' in length.
Date, plate or visually
1 June 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
321
R.A. / Dec. - Constellation
20:48:48.2 +39°34'51.8" - Cygnus
Suspected nature of object
Reflection nebula
Description
Nebula surrounding the mag. 11.8 star TYC3170-00204-1, approximately 2'×1' in size.
Date, plate or visually
2 June 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
322
R.A. / Dec. - Constellation
20:34:45 +40°52'40" - Cygnus
Suspected nature of object
Nebula(e)
Description
3 Small nebulous loops, aligned southwest to northeast. The southwestern and the east-northeastern ones may have been cataloged as "Interstellar Medium Objects"; the central one apparently has not been cataloged. More objects suspected to be of similar nature are in the emission nebula Simeis 80 to the east-southeast.
Date, plate or visually
10 June 2024, plate
10' POSS2 Red
10' SDSS
10' PanSTARRS
323
R.A. / Dec. - Constellation
06:47:47.9 +74°28'16.5" - Camelopardalis
Suspected nature of object
Galaxy
Description
A small galaxy, 40" south-southeast of the galaxy NGC2258. Incorrectly cataloged as a star (4UCAC823-013359, mag. 15.6).
Observed in the early morning of 4 November 2018, not recognized as a galaxy until 17 June 2024.
Date, plate or visually
4 November 2018, visually
5' POSS2 Blue
5' POSS2 Red
5' PanSTARRS
324
R.A. / Dec. - Constellation
21:43:55.1 +47°48'15.0" - Cygnus
Suspected nature of object
Reflection nebula
Description
A small and faint nebula northwest of the mag. 11.8 star TYC3595-01670-1.
Date, plate or visually
26 June 2024, plate
10' POSS2 Blue
10' POSS1 Blue
325
R.A. / Dec. - Constellation
21:28:02 +49°44'50" - Cygnus
Suspected nature of object
Reflection nebula
Description
A small, irregular, T-shaped nebula directly north of the mag. 10.7 star TYC3598-01640-1.
Date, plate or visually
26 June 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
10' SDSS
326
R.A. / Dec. - Constellation
21:07:56 +49°37'45" - Cygnus
Suspected nature of object
Reflection nebula
Description
A small, fan-shaped nebula extending northwestwards from the mag. 9.2 star SAO50484. Not LBN410.
Date, plate or visually
30 June 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
327
R.A. / Dec. - Constellation
21:48:07 +49°10'30" - Cygnus
Suspected nature of object
Reflection nebula
Description
A small, east-west elongated nebula north-northwest of the mag. 10.3 star TYC3612-01672-1.
Date, plate or visually
30 June 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
328
R.A. / Dec. - Constellation
21:54:11 +59°44'55" - Cygnus
Suspected nature of object
Reflection nebula
Description
Very faint, irregular, east-west elongated nebulosity involving three stars, mag. 10.9 and greater.
Date, plate or visually
30 June 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
329
R.A. / Dec. - Constellation
01:50:15.5 +53°41'34.9" - Perseus
Suspected nature of object
Reflection nebula
Description
A small nebula surrounding the mag. 15.2 star 4UCAC719-015428. East-southeast of the middle of the large emission nebula Lynds 640. 3.5' Southwest of the variable star TT Persei (mag. 9.2-10.6).
Date, plate or visually
14 July 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
330
R.A. / Dec. - Constellation
18:19:20.0 -13°54'21.6" - Serpens (Cauda)
Suspected nature of object
Reflection nebula
Description
A small, irregular nebula surrounding the mag. 10.8 star TYC5689-00641-1, southeast of the middle of the large emission nebula Messier 16 (NGC6611) - the "Eagle Nebula".
Date, plate or visually
17 July 2024, plate
10' POSS2 Blue
10' PanSTARRS
331
R.A. / Dec. - Constellation
18:24:01.7 -15°31'39.0" - Scutum
Suspected nature of object
Reflection nebula
Description
A faint nebula surrounding the mag. 12.4 star 4UCAC373-126715.
Date, plate or visually
19 July 2024, plate
10' POSS1 Blue
10' PanSTARRS
332
R.A. / Dec. - Constellation
18:35:22.2 -00°26'34.8" - Serpens (Cauda)
Suspected nature of object
Reflection nebula
Description
A faint nebula surrounding the mag. 12.4 star 4UCAC448-082070. 13' South of the planetary nebula Abell 47.
Date, plate or visually
20 July 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
333
R.A. / Dec. - Constellation
18:34:30.7 -00°29'25.5" - Serpens (Cauda)
Suspected nature of object
Reflection nebula
Description
A faint nebula surrounding the mag. 13.6 star 4UCAC448-082036.
Date, plate or visually
20 July 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
334
R.A. / Dec. - Constellation
18:36:57.5 +00°20'35.7" - Serpens (Cauda)
Suspected nature of object
Reflection nebula
Description
A faint nebula surrounding the mag. 10.8 star TYC0446-00384-1.
Date, plate or visually
20 July 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
335
R.A. / Dec. - Constellation
17:23:11 -53°57'55.0" - Ara
Suspected nature of object
(Planetary) nebula
Description
An extremely faint, southwest-northeast elongated, oval-shaped blob, 3'×2' in size. An annular shape as well as protrusion on the southwestern and northeastern sides are discernible on the DECaPS image.
Date, plate or visually
23 July 2024, plate
15' POSS2 Red
15' DECaPS DR2
336
R.A. / Dec. - Constellation
18:08:35.3 -18°03'30.0" - Sagittarius
Suspected nature of object
Dark nebula
Description
A small, dark (cometary) globule, approximately 1' in size.
13' North-northwest of the emission nebula Sharpless 1-26.
Date, plate or visually
3 September 2024, plate
10' POSS2 Red
10' POSS1 Red
10' PanSTARRS
337
R.A. / Dec. - Constellation
18:00:27.8 -24°18'10.0" - Sagittarius
Suspected nature of object
Reflection nebula
Description
A small reflection nebula surrounding the mag. 11.9 star 4UCAC329-120117.
Date, plate or visually
3 September 2024, plate
10' POSS2 Red
10' PanSTARRS
338
R.A. / Dec. - Constellation
17:57:07.5 -23°56'20.0" - Sagittarius
Suspected nature of object
Nebula
Description
North-northwest - south-southeast elongated, irregular nebulosity to the east, northeast and north of the mag. 6.9 K5 star SAO185981.
Date, plate or visually
3 September 2024, plate
10' POSS2 Red
10' POSS1 Red
10' PanSTARRS
339
R.A. / Dec. - Constellation
18:00:43.5 -22°28'19.8" - Sagittarius
Suspected nature of object
Reflection nebula
Description
Nebulosity surrounding the mag. 11.6 star 4UCAC338-120968. Fainter nebulosity fans out towards the northwest.
Date, plate or visually
3 September 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
340
R.A. / Dec. - Constellation
18:03:48.9 -23°18'01.8" - Sagittarius
Suspected nature of object
Reflection nebula
Description
A small nebula to the northwest of the mag. 9.0 B5 star SAO186202.
Date, plate or visually
3 September 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
341
R.A. / Dec. - Constellation
18:12:05.6 -23°13'05.3" - Sagittarius
Suspected nature of object
Reflection nebula
Description
A small and faint nebula surrounding the mag. 1.8 star TYC6843-01412-1.
Date, plate or visually
3 September 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
342
R.A. / Dec. - Constellation
18:06:54 -21°44'50" - Sagittarius
Suspected nature of object
Reflection nebula
Description
Reflection nebula surrounding the double star Aravamudan 1509 (WDS18069-2144).
Involved in the large emission nebula Courtès 17.
Date, plate or visually
3 September 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
343
R.A. / Dec. - Constellation
18:07:08.4 -21°51'27.1" - Sagittarius
Suspected nature of object
Reflection nebula
Description
Reflection nebula surrouding the mag. 12.0 star TYC6263-01399-1.
Involved in the large emission nebula Courtès 17.
Date, plate or visually
3 September 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
344
R.A. / Dec. - Constellation
18:07:15.7 -21°14'37.9" - Sagittarius
Suspected nature of object
Reflection nebula
Description
A small and faint nebula north of the mag. 11.3 star TYC6263-01904-1.
Date, plate or visually
3 September 2024, plate
10' POSS2 Blue
10' PanSTARRS
345
R.A. / Dec. - Constellation
18:18:02.9 -16°52'24.9" - Sagittarius
Suspected nature of object
Reflection nebula
Description
Surrounding the mag. 12.6 star 4UCAC366-123534. A smaller (emission) nebula is to the east-northeast.
On the POSS1 Blue image a prominent image artefact is south of the nebula.
Date, plate or visually
4 September 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
346
R.A. / Dec. - Constellation
18:18:16.2 -16°50'38.7" - Sagittarius
Suspected nature of object
Nebula
Description
West of the mag. 14.0 star 4UCAC366-123575.
Date, plate or visually
4 September 2024, plate
10' POSS2 Red
10' POSS1 Red
10' POSS1 Blue
10' PanSTARRS
347
R.A. / Dec. - Constellation
18:18:25.8 -16°50'40.0" - Sagittarius
Suspected nature of object
Emission nebula
Description
A small, irregular nebula.
Date, plate or visually
4 September 2024, plate
10' POSS2 Red
10' PanSTARRS
348
R.A. / Dec. - Constellation
18:18:06 -16°49'21" - Sagittarius
Suspected nature of object
Reflection nebula
Description
An extremely faint nebula. Best viewed on PanSTARRS imagery.
Date, plate or visually
4 September 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
349
R.A. / Dec. - Constellation
18:16:18.6 -16°53'53.6" - Sagittarius
Suspected nature of object
Reflection nebula
Description
Surrounding the mag. 12 star 4UCAC366-122817.
Date, plate or visually
4 September 2024, plate
10' POSS2 Blue
10' POSS1 Blue
10' PanSTARRS
350
R.A. / Dec. - Constellation
18:02:00.7 -25°35'05.9" - Sagittarius
Suspected nature of object
Reflection nebula
Description
A small and very faint, irregular nebula surrounding the mag. 12.7 star 4UCAC323-128838. Most prominent southeast of the star.
Date, plate or visually
4 September 2024, plate
10' POSS2 Blue
10' PanSTARRS
