Discoveries 201 - 250
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 & SDSS (for suspected galaxies), the HASH Planetary Nebulae database and other 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 remove it from my list and update the numbering accordingly.
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201 - 202 - 203 - 204 - 205 - 206 - 207 - 208 - 209 - 210 - 211 - 212 - 213 - 214 - 215 - 216 - 217 - 218 - 219 - 220 - 221 - 222 - 223 - 224 - 225 - 226 - 227 - 228 - 229 - 230 - 231 - 232 - 233 - 234 - 235 - 236 - 237 - 238 - 239 - 240 - 241 - 242 - 243 - 244 - 245 - 246 - 247 - 248 - 249 - 250
1-50 - 51-100 - 101-150 - 151-200 - 251-300 - 301-350 - 351 and further
201
R.A. / Dec. - Constellation
03:18:58.8 +60°22'30.0" - Camelopardalis
Suspected nature of object
Reflection nebulae
Description
A double reflection nebula surrounding the stars 4UCAC752-029182 (south, mag. 15.8) & 4UCAC752-029181 (north, mag. 15.9).
Date, plate or visually
2 October 2023, plate
5' DSS POSS2 Blue
5' DSS POSS1 Blue
202
R.A. / Dec. - Constellation
04:44:04 +62°26'45" - Camelopardalis
Suspected nature of object
Reflection nebula
Description
An extremely faint, NW-SE elongated nebula south of the mag. 10.7 star TYC4082-00369-1.
Date, plate or visually
2 October 2023, plate
10' DSS POSS2 Blue - 1996
10' DSS POSS2 Blue - 1993
203
R.A. / Dec. - Constellation
03:00:52.2 +52°21'06.2" - Perseus
Suspected nature of object
Reflection nebula
Description
Drapes of nebulosity east of the double star STF331 (mag. 5.3 B7 & mag. 6.2 B9).
Date, plate or visually
4 October 2023, plate
15' DSS POSS2 Blue
15' DSS POSS1 Blue
204
R.A. / Dec. - Constellation
18:10:00.3 +68°49'24.0" - Draco
Suspected nature of object
Galaxy?
Description
A suspected galaxy directly northwest of the mag. 8.4 M0 star SAO17799 - a nearby supernova was recorded on 27 June 2023.
Date, plate or visually
4 October 2023, plate
5' DSS POSS2 Blue
5' DSS POSS2 Red
5' DECaLS
205
R.A. / Dec. - Constellation
03:02:12.7 +41°35'55.0" - Perseus
Suspected nature of object
Part of galaxy?
Description
A nebulous loop, almost 180°, east to north of S0 galaxy MCG+07-07-017 (PGC11449).
Date, plate or visually
4 October 2023, plate
5' DSS POSS2 Blue
5' DSS POSS2 Red
5' SDSS
5' PanSTARRS
206
R.A. / Dec. - Constellation
02:52:53 +20°13'00" - Aries
Suspected nature of object
Dark nebula
Description
A north-northwest - south-southeast elongated dark nebula, shaped like a wrench, 20' long.
Date, plate or visually
4 October 2023, plate
30' DSS POSS2 Blue
30' DSS POSS2 Red
30' SDSS
30' PanSTARRS
207
R.A. / Dec. - Constellation
03:21:06 +48°49'40" - Perseus
Suspected nature of object
Reflection nebula
Description
Relatively large, northwest-southeast elongated streaks west of the mag. 8.0 A0 star SAO38745. Approximately 7' in length.
Date, plate or visually
4 October 2023, plate
15' DSS POSS2 Blue
15' DSS POSS1 Blue
208
R.A. / Dec. - Constellation
03:20:10.6 +46°12'00.0" - Perseus
Suspected nature of object
Dark nebula
Description
A small dark nebula, elongated north to south, approximately 3.5' in length.
Date, plate or visually
4 October 2023, plate
15' DSS POSS2 Blue
15' DSS POSS2 Red
15' PanSTARRS
209
R.A. / Dec. - Constellation
03:20:21 +41°53'58" - Perseus
Suspected nature of object
Galaxy?
Description
A small, irregular galaxy ENE of the mag. 8.2 A2 star SAO38738.
Date, plate or visually
4 October 2023, plate
5' DSS POSS2 Blue
5' DSS POSS2 Red
5' SDSS
210
R.A. / Dec. - Constellation
02:32:22.3 +40°16'20.9" - Andromeda
Suspected nature of object
Nebula?
Description
A small nebulous spike protruding northwards from the mag. 6.7 A0 star SAO38099.
Date, plate or visually
4 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
211
R.A. / Dec. - Constellation
00:34:17.4 +58°56'05.6" - Cassiopeia
Suspected nature of object
Nebula
Description
An irregular nebula surrounding the mag. 12.4 star 4UCAC745-004459.
Date, plate or visually
4 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
212
R.A. / Dec. - Constellation
18:05:32.4 -01°57'56.0" - Serpens (Cauda)
Suspected nature of object
Reflection nebula
Description
Southwest-northeast elongated streaks of nebulosity south of the mag. 8.5 K0 star SAO142075.
Date, plate or visually
5 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
10' PanSTARRS
213
R.A. / Dec. - Constellation
00:12:43.5 +65°32'42.8" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small nebula surrounding the mag. 10.8 star HIP1021. 83" East-southeast of Parsamian-Petrosyan 4, yet this little nebula seems to have remained uncataloged. 6' Northeast is the reflection nebula Cederblad 1.
Date, plate or visually
5 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
214
R.A. / Dec. - Constellation
20:24:35 +65°39'00" - Draco
Suspected nature of object
Dark nebula
Description
A southwest-northeast elongated, two lobed dark nebula, approximately 4.5 arcminutes in length. Fainter extensions towards the southwest.
Date, plate or visually
6 October 2023, plate
15' DSS POSS2 Blue
15' DSS POSS2 Red
15' PanSTARRS
215
R.A. / Dec. - Constellation
04:55:03.1 +55°15'32.9" - Camelopardalis
Suspected nature of object
Reflection nebula
Description
East-west elongated streaks south and southeast of the mag. 5.5 B9.5 (double) star 5 Camelopardalis. Approximately 12' in length.
Date, plate or visually
6 October 2023, plate
30' DSS POSS2 Blue
30' DSS POSS1 Blue
216
R.A. / Dec. - Constellation
23:20:06 +23°53'30" - Pegasus
Suspected nature of object
Nebula
Description
An L-shaped nebulous feature, approximately 6'×3' in size.
Date, plate or visually
6 October 2023, plate
15' DSS POSS2 Blue
15' DSS POSS2 Red
217
R.A. / Dec. - Constellation
01:04:26.9 +66°14'23.7" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small nebula surrounding the mag. 12.9 star 4UCAC002561, on the northern edge of the dark nebula DOBASHI 3757.
Date, plate or visually
10 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
218
R.A. / Dec. - Constellation
00:42:40.8 +68°09'50.4" - Cassiopeia
Suspected nature of object
Nebula
Description
A small, southeast-northwest elongated nebula north of the mag. 7.9 K0 star SAO11341.
Date, plate or visually
10 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
219
R.A. / Dec. - Constellation
23:31:31.1 +69°25'04.5" - Cepheus
Suspected nature of object
Nebula
Description
A very small, nebulous spike protruding northeastwards from the mag. 9.7 F5 star HIP116104.
Date, plate or visually
10 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
220 - "Ton's Nebula"
R.A. / Dec. - Constellation
00:01:57.7 +63°39'05.1" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
"Ton's Nebula"
A small, east-west elongated nebula surrounding the mag. 13.3 star 4UCAC769-000419.
Discovered 11 years to the day after my beloved father Ton van Wulfen traded earth for eternity. Ton II, III & IV were discovered on this same day.
Date, plate or visually
11 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
10' PanSTARRS
221 - Ton II
R.A. / Dec. - Constellation
23:50:28.5 +63°56'58.0" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
"Ton II"
A small nebula surrounding the mag. 12.9 star 4UCAC770-065904, most prominent to the south of the star.
Discovered 11 years to the day after my beloved father Ton van Wulfen traded earth for eternity. Ton I - "Ton's Nebula", Ton III & IV were discovered on this same day.
Date, plate or visually
11 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
10' PanSTARRS
222 - Ton III
R.A. / Dec. - Constellation
00:05:45.2 +55°41'48.8" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
"Ton III"
A nebulous spike, orientated north-northwest to south-southeast, with a fainter curved section southwest thereof. Shaped like the Greek letter Lambda. Southeast of the mag. 7.1 K0 star SAO21076.
Discovered 11 years to the day after my beloved father Ton van Wulfen traded earth for eternity. Ton I - "Ton's Nebula", Ton II & IV were discovered on this same day.
Date, plate or visually
11 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
10' PanSTARRS
223 - Ton IV
R.A. / Dec. - Constellation
00:11:46.3 +56°38'55.3" - Cassiopeia
Suspected nature of object
Nebula
Description
"Ton IV"
A small nebula surrounding the mag. 10.6 star TYC3660-00726-1.
Discovered 11 years to the day after my beloved father Ton van Wulfen traded earth for eternity. Ton I - "Ton's Nebula", Ton II & III were discovered on this same day.
Date, plate or visually
11 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
224
R.A. / Dec. - Constellation
00:32:16.6 +65°36'08.2" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small and faint, east-west elongated nebula northeast of the mag. 10.6 star TYC4023-00215-1. On the southern edge of a dark nebula.
Date, plate or visually
12 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
225
R.A. / Dec. - Constellation
00:40:31.6 +66°53'37.2" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small, irregular nebula involving 4 faint stars.
7' East-northeast of nr. 235.
Date, plate or visually
12 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
10' PanSTARRS
226
R.A. / Dec. - Constellation
00:39:21.6 +66°51'46.6" - Cassiopeia
Suspected nature of object
Emission nebula
Description
A faint nebula surrounding the mag. 13.2 star 4UCAC785-001518.
7' West-southwest of nr. 234.
Date, plate or visually
12 October 2023, plate
10' DSS POSS2 Red
10' DSS POSS1 Red
227
R.A. / Dec. - Constellation
00:51:33.4 +65°47'58.7" - Cassiopeia
Suspected nature of object
Nebula
Description
A small, irregular nebula surrounding the mag. 15.8 star 4UCAC779-002131. May involve a faint star cluster. Approximately 7' west of the middle of the large and faint emission nebula Sharpless 2-183.
Date, plate or visually
12 October 2023, plate
5' DSS POSS2 Blue
5' DSS POSS2 Red
5' PanSTARRS
228
R.A. / Dec. - Constellation
00:50:43.6 +64°14'51.2" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
East-west elongated streaks of nebulosity north of the mag. 5.5 G5 star SAO11424.
Date, plate or visually
12 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
229
R.A. / Dec. - Constellation
00:29:52.8 +57°41'22.5" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small, curved nebula northwest of the mag. 10.9 star TYC3662-02233-1.
Date, plate or visually
12 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
230
R.A. / Dec. - Constellation
01:30:07.5 +64°25'20.9" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
West-northwest - east-southeast elongated nebulosity surrounding the mag. 8.4 B2 star SAO11780. Approximately 4' in length.
Date, plate or visually
13 October 2023, plate
15' DSS POSS2 Blue
15' DSS POSS1 Blue
231
R.A. / Dec. - Constellation
01:37:44.4 +65°03'21.2" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small nebula south of the mag. 12.6 star TYC4039-00719-1.
Date, plate or visually
13 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
232
R.A. / Dec. - Constellation
01:04:11.8 +62°06'05.1" - Cassiopeia
Suspected nature of object
Nebula
Description
A small, north-northeast to south-southwest elongated nebula east of the mag. 13.5 star 4UCAC761-009805.
Date, plate or visually
13 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
233
R.A. / Dec. - Constellation
01:26:16.2 +62°04'45.8" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
Faint nebulosity east-northeast of the mag. 10.4 star TYC4035-02292-1.
Date, plate or visually
13 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
234
R.A. / Dec. - Constellation
00:44:04 +56°07'35" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A two-lobed nebula involving three mag. 11.4 and fainter stars, approximately 2.5' in size. Involved in larger, fainter nebulosity. 14' North of nr. 235.
Date, plate or visually
14 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
235
R.A. / Dec. - Constellation
00:44:13.3 +55°52'56.8" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small nebula surrounding the mag. 11.9 star 4UCAC730-007336. 8' Northwest of the reflection nebula Neckel-Staude 2, 6' north-northwest of nr. 236 and 14' south of nr. 244.
Date, plate or visually
14 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
236
R.A. / Dec. - Constellation
00:44:21.4 +55°46'42.6" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small east-west elongated nebula surrounding the stars 4UCAC729-007111 (mag. 14.2) and 4UCAC729-007112 (mag. 13.7). 5' West of the reflection nebula Neckel-Staude 2 and 6' south-southeast of nr. 235.
Date, plate or visually
14 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
237
R.A. / Dec. - Constellation
00:58:50.8 +56°18'34.7" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small nebula surrounding the mag. 12.6 star 4UCAC732-009331.
Possibly part of the group of nebulae identified by Rojkovskij & Kurchakov (Rojkovskij-Kurchakov 5, that includes Dorschner-Gürtler 6).
Date, plate or visually
14 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
238
R.A. / Dec. - Constellation
01:11:21.8 +57°32'15.0" - Cassiopeia
Suspected nature of object
Emission & reflection nebula
Description
A large and relatively bright nebula involving several stars mag. 9.3 and fainter, that form a cluster designated SFR 125.61-5.21. Approximately 10'×7' in size, brightest in the northeastern part. North of the middle is a small reflection nebula surrounding the mag. 12.7 star TYC3677-00890-1 with a notable, semicircular feature directly northeast thereof.
Date, plate or visually
14 October 2023, plate
15' DSS POSS2 Blue
15' DSS POSS2 Red
239
R.A. / Dec. - Constellation
00:49:19.3 +62°29'10.6" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small, irregular nebula surrounding the mag. 12.4 star TYC4020-01468-1.
Date, plate or visually
15 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
240
R.A. / Dec. - Constellation
01:25:11.1 +54°22'42.0" - Cassiopeia
Suspected nature of object
Galaxy
Description
A small, irregular / peculiar galaxy, approximately 0.8'×0.6' in size. Southeast of the mag. 9.0 A0 star SAO22261.
Date, plate or visually
15 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
241
R.A. / Dec. - Constellation
01:17:22.1 +63°58'18.4" - Cassiopeia
Suspected nature of object
Nebula, planetary nebula?
Description
An irregular nebula surrounding the mag. 10.8 star TYC4038-00404-1.
Date, plate or visually
18 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
242
R.A. / Dec. - Constellation
23:03:51.6 +56°45'54.0" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A southwest-northeast elongated nebula northwest of the mag. 7.4 F0 star SAO35109. South-southeast of the emission nebula Courtès 100.
Date, plate or visually
19 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
243
R.A. / Dec. - Constellation
23:33:35.7 +60°28'07.0" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small, southwest-northeast elongated nebula northeast of the mag. K0 star SAO20701 that is component A of the double star STFA60 (WDS23336+6028). 14" East-southeast of nr. 245.
On the POSS2 Blue plate, there is an east-west elongated artefact to the southwest of the star.
Date, plate or visually
20 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
244
R.A. / Dec. - Constellation
23:28:45.0 +60°39'10.0" - Cassiopeia
Suspected nature of object
Nebula
Description
A small nebula involving the stars 4UCAC754-080243 (mag. 14.6) and 4UCAC754-080244 (mag. 13.2). 23' West-northwest of nr. 245.
Date, plate or visually
20 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
10' PanSTARRS
245
R.A. / Dec. - Constellation
23:31:48.4 +60°33'05.0" - Cassiopeia
Suspected nature of object
Planetary nebula?
Description
A small, round nebula, approximately 50" in diameter. Not visible in IR. 14" West-northwest of nr. 243 and 23' east-southeast of nr. 244.
Date, plate or visually
20 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
10' PanSTARRS
246
R.A. / Dec. - Constellation
23:39:18 +60°13'50" - Cassiopeia
Suspected nature of object
Emission nebula
Description
An east-west elongated nebula north of the mag. 10.6 star TYC4280-01400-1.
16' North-northeast of the emission nebula Simeis 273.
Date, plate or visually
20 October 2023, plate
10' DSS POSS2 Red
10' DSS POSS1 Red
10' PanSTARRS
247
R.A. / Dec. - Constellation
23:36:26.5 +49°46'20.0" - Andromeda
Suspected nature of object
Reflection nebulae
Description
Two southwest-northeast elongated nebulous streaks: one to the northwest of the position, one to the southeast. Both are approximately 8' in length.
Date, plate or visually
20 October 2023, plate
20' DSS POSS2 Blue
20' DSS POSS1 Blue
248
R.A. / Dec. - Constellation
00:19:00.5 +60°20'07.0" - Cassiopeia
Suspected nature of object
Reflection nebulae
Description
Irregular nebulosity surrounding the mag. 8.0 F0 star SAO11104.
Date, plate or visually
20 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
249
R.A. / Dec. - Constellation
23:54:02.0 +60°31'03.8" - Cassiopeia
Suspected nature of object
Planetary nebula?
Description
A small, round nebula surrounding the mag. 16.1 star 4UCAC753-086599. A distinct annular shape is visible on the PanSTARRS image.
2.5' South of the reflection nebula GN 23.51.5.01, 7' east-northeast of the emission nebula Minkowski 2-74 and 8' north of Sharpless 1-116.
Date, plate or visually
20 October 2023, plate
5' DSS POSS2 Blue
5' DSS POSS1 Blue
5' PanSTARRS
250
R.A. / Dec. - Constellation
23:57:20 +52°47'35" - Cassiopeia
Suspected nature of object
Asterism or open cluster
Description
A small asterism or open cluster, consisting of about 20 stars mag. 12.2 and greater, approximately 4.5' in diameter
Date, plate or visually
20 October 2023, plate
15' DSS POSS2 Blue
15' DSS POSS2 Red
