Discoveries 276 - 300
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 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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276 - 277 - 278 - 279 - 280 - 281 - 282 - 283 - 284 - 285 - 286 - 287 - 288 - 289 - 290 - 291 - 292 - 293 - 294 - 295 - 296 - 297 - 298 - 299 - 300
1-25 - 26-50 - 51-75 - 76-100 - 101-125 - 126-150 - 151-175 - 176-200 - 201-225 - 226-250 - 251-275 - 301-325 - 326-350 - 351 and further
276
R.A. / Dec. - Constellation
20:09:59.7 +27°26'10.4" - Vulpecula
Suspected nature of object
Reflection nebula
Description
A small nebula surrounding the mag. 14.0 star 4UCAC588-104727, most prominent to the west of the star. Forms a triangle with a known nebula 4' to the north-northeast and 5' to the east-southeast.
9' East-southeast of nr. 277.
Date, plate or visually
24 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
277
R.A. / Dec. - Constellation
20:09:19.5 +27°29'20.0" - Vulpecula
Suspected nature of object
Nebula
Description
An east-west elongated nebula, suspected to be both reflective and emissive. On the northern edge is the mag. 17.1 star 4UCAC588-104666, on the east-southeastern edge is the mag. 15.2 star 4UCAC588-104673.
9' West-northwest of nr. 276.
Date, plate or visually
24 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
278
R.A. / Dec. - Constellation
05:59:29.5 +19°46'46.0" - Orion
Suspected nature of object
Reflection nebula, planetary nebula?
Description
A faint, round nebula surrounding the mag. 8.4 B9 star SAO95087. Only visible on Blue POSS plates.
Date, plate or visually
27 January 2024, plate
15' DSS POSS2 Blue
15' DSS POSS1 Blue
279
R.A. / Dec. - Constellation
05:57:13.2 +17°03'03.0" - Orion
Suspected nature of object
Dark nebula
Description
A dark, cometary globule, approximately 100" in size north to south.
Date, plate or visually
27 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
280
R.A. / Dec. - Constellation
05:57:53.7 +17°03'19.0" - Orion
Suspected nature of object
Dark nebula
Description
A small, north-northeast to south-southwest elongated nebula with a curved shape. Approximately 2' in length.
Date, plate or visually
27 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
281
R.A. / Dec. - Constellation
05:58:24 +17°07'20" - Orion
Suspected nature of object
Dark nebula
Description
A small, north-south elongated dark nebula, tapering towards the south. Approximately 2.5' in length.
Date, plate or visually
27 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
282
R.A. / Dec. - Constellation
05:58:44 +16°42'20" - Orion
Suspected nature of object
Dark nebula
Description
A small, teardrop-shaped dark nebula, approximately 100" in size.
Date, plate or visually
27 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
283
R.A. / Dec. - Constellation
06:20:06.6 +13°45'00.0" - Orion
Suspected nature of object
Dark nebula
Description
A north-northeast to south-southwest elongated, irregular dark nebula, approximately 3.5'×2.0' in size.
Date, plate or visually
31 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
10' PanSTARRS
284
R.A. / Dec. - Constellation
06:20:47.1 +14°56'05.0" - Orion
Suspected nature of object
Reflection nebula
Description
A small, very faint, elongated reflection nebula northwest of the mag. 10.1 star TYC0743-00052-1. Two more faint streaks in the same orientation are to the west-northwest.
Date, plate or visually
31 January 2024, plate
10' DSS POSS2 Blue
10' PanSTARRS
285
R.A. / Dec. - Constellation
06:20:12.3 +14°53'00.0" - Orion
Suspected nature of object
Dark nebula
Description
An irregular dark nebula, approximately 5.0'×2.5' in size.
Date, plate or visually
31 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
286
R.A. / Dec. - Constellation
05:49:15 +33°24'15" - Auriga
Suspected nature of object
Nebula
Description
An irregular nebula, approximately 3.0'×2.5' in size, possibly extending further towards the north. The double star Jonckheere 903 (WDS05493+3323) is on the southern edge. 14' South of the open cluster King 8.
Date, plate or visually
31 January 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
287
R.A. / Dec. - Constellation
01:48:43.9 +53°21'13.0" - Perseus
Suspected nature of object
Galaxy or nebula
Description
A small, irregular, suspected galaxy or nebula.
Date, plate or visually
5 February 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
288
R.A. / Dec. - Constellation
01:46:59 +53°01'30" - Perseus
Suspected nature of object
Nebula
Description
A very faint, north-northeast to south-southwest elongated, two-lobed nebula, approximately 3.0'×0.6' in size.
Date, plate or visually
5 February 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' DSS POSS1 Blue
10' DSS POSS1 Red
289
R.A. / Dec. - Constellation
01:44:16 +54°27'10" - Perseus
Suspected nature of object
Nebula
Description
A faint, east-west elongated, irregular nebula, approximately 5.0'×2.5' in size.
Date, plate or visually
5 February 2024, plate
15' DSS POSS2 Blue
15' DSS POSS2 Red
15' PanSTARRS
290
R.A. / Dec. - Constellation
01:39:53.4 +54°13'00" - Perseus
Suspected nature of object
Nebula
Description
A faint, irregular nebula, approximately 2.5' in size.
Date, plate or visually
5 February 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
291
R.A. / Dec. - Constellation
01:36:17 +54°18'30" - Perseus
Suspected nature of object
Nebula
Description
A faint, northeast-southwest elongated nebula, approximately 2'×1' in size. On the POSS2 Blue image there is a distinct round image artefact directly southeast.
Date, plate or visually
5 February 2024, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
292
R.A. / Dec. - Constellation
06:14:00 +18°47'00" - Orion
Suspected nature of object
Nebula
Description
A nebulous blob, approximately 3' in size. Northeast of the mag. 6.2 star SAO95397.
Date, plate or visually
6 February 2024, plate
15' DSS POSS2 Blue
15' DSS POSS2 Red
293
R.A. / Dec. - Constellation
06:13:42.7 +18°25'17.0" - Orion
Suspected nature of object
Nebula
Description
East-west elongated nebulosity, approximately in 3' in length. North of the mag. 9.1 star SAO95403. Possibly a brighter part of a larger nebula.
Date, plate or visually
6 February 2024, plate
15' DSS POSS2 Blue
15' DSS POSS1 Blue
294
R.A. / Dec. - Constellation
07:24:57.6 -16°08'30.4" - Canis Major
Suspected nature of object
Reflection nebula
Description
A small and faint, north-south elongated reflection nebula surrounding the mag. 14.0 star 4UCAC370-028882, most prominent to the west of the star.
Date, plate or visually
18 February 2024, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
295
R.A. / Dec. - Constellation
07:29:05.4 -21°50'51.0" - Canis Major
Suspected nature of object
Reflection nebula? Planetary nebula?
Description
A round nebula, approximately in 45" diameter, brightest in the southeastern part. On the east-northeastern edge is the mag. 13.0 star 4UCAC341-028641. 11' Northeast of the nebula Brand, Blitz, Wouterloot 29.
Date, plate or visually
18 February 2024, plate
10' DSS POSS2 Blue
10' PanSTARRS
296
R.A. / Dec. - Constellation
05:56:10 +51°50'00" - Auriga
Suspected nature of object
Reflection nebula
Description
A southwest-northeast elongated nebulous streak, approximately 3' in length. Northwest of the mag. 6.5 star SAO25467.
Date, plate or visually
4 March 2024, plate
15' DSS POSS2 Blue
15' DSS POSS1 Blue
297
R.A. / Dec. - Constellation
05:03:59.4 -10°38'04.0" - Eridanus
Suspected nature of object
Reflection nebula
Description
A west-southwest to east-northeast elongated nebula surrounding the mag. 7.7 K0 star SAO150111.
Date, plate or visually
12 March 2024, plate
10' DSS POSS2 Blue
10' DECaLS DR10
298
R.A. / Dec. - Constellation
06:24:56.0 +20°00'04.3" - Gemini
Suspected nature of object
Reflection nebula
Description
A small reflection nebula surrounding the mag. 14.7 star 4UCAC551-026164.
Date, plate or visually
14 March 2024, plate
5' DSS POSS2 Blue
5' PanSTARRS
299
R.A. / Dec. - Constellation
06:24:37.3 +22°04'51.3" - Gemini
Suspected nature of object
Reflection nebula
Description
A small, relatively bright reflection nebula surrounding the mag. 12.7 star 4UCAC561-029121.
Date, plate or visually
14 March 2024, plate
5' DSS POSS2 Blue
5' DSS POSS1 Blue
5' PanSTARRS
300
R.A. / Dec. - Constellation
03:23:32 +30°25'50" - Aries
Suspected nature of object
Reflection nebula
Description
A nebula surrounding the mag. 8.3 A0 star SAO56405, most prominent to the southeast of the star. 11' Southeast is the reflection nebula Gyulbudaghian-Magakian 1-2.
Date, plate or visually
16 March 2024, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
