Discoveries 226 - 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 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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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
1-25 - 26-50 - 51-75 - 76-100 - 101-125 - 126-150 - 151-175 - 176-200 - 201-225 - 251-275 - 276-300 - 301 and further
226
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
227
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
228
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
229 - "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
230 - 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
231 - 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
232 - 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
233
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
234
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
235
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
236
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
237
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
238
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
239
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
240
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
241
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
242
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
243
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. 245.
Date, plate or visually
14 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
244
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. 246 and 14' south of nr. 244.
Date, plate or visually
14 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
245
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. 245.
Date, plate or visually
14 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
246
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. 13' South-southeast of the group of 4 nebulae that form Dorschner-Gürtler 6.
Date, plate or visually
14 October 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
247
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
248
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
249
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
250
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
