Discoveries 151 - 200
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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151 - 152 - 153 - 154 - 155 - 156 - 157 - 158 - 159 - 160 - 161 - 162 - 163 - 164 - 165 - 166 - 167 - 168 - 169 - 170 - 171 - 172 - 173 - 174 - 175 - 176 - 177 - 178 - 179 - 180 - 181 - 182 - 183 - 184 - 185 - 186 - 187 - 188 - 189 - 190 - 191 - 192 - 193 - 194 - 195 - 196 - 197 - 198 - 199 - 200
1-50 - 51-100 - 101-150 - 201-250 - 251-300 - 301-350 - 351 and further
151
R.A. / Dec. - Constellation
21:12:40 +74°42'13" - Cepheus
Suspected nature of object
Nebula
Description
Nebula surrounding the mag. 11.0 star TYC4473-00307-1.
Date, plate or visually
25 April 2023, plate
152
R.A. / Dec. - Constellation
12:55:37.5 +08°13'12" - Virgo
Suspected nature of object
Nebula? Galaxy? Planetary nebula?
Description
V-shaped nebulosity, almost one arcminute in size, to the southeast of the mag. 8.8 G5 star SAO119672. To the north-northwest of the star is the galaxy NGC4803.
Date, plate or visually
31 July 2023, plate
153
R.A. / Dec. - Constellation
06:15:19 +70°16'28" - Camelopardalis
Suspected nature of object
Galaxy
Description
A small, oval shaped, east-west elongated blow. Approximately 0.3'×0.2' in size.
Date, plate or visually
31 July 2023, plate
154
R.A. / Dec. - Constellation
18:42:11 +88°18'15" - Ursa Minor
Suspected nature of object
Nebula
Description
A very small nebula directly north-northwest of the mag. 9.6 star SAO3184 (component A of double star HJ2971 - WDS18422+8818).
Date, plate or visually
31 July 2023, plate
155
R.A. / Dec. - Constellation
23:45:47 +32°08'15" - Pegasus
Suspected nature of object
Reflection nebula
Description
Irregular nebulosity west-southwest of the mag. 9.8 star SAO73490 (component A of the double star Aitken 1243 - WDS23459+3209).
Date, plate or visually
31 July 2023, plate
156
R.A. / Dec. - Constellation
19:58:25.7 +32°40'25.0" - Cygnus
Suspected nature of object
Reflection nebula
Description
A small, west-southwest to east-northeast elongated (reflection) nebula directly north of the mag. 9.6 star TYC2674-03189-1.
Date, plate or visually
16 August 2023, plate
157
R.A. / Dec. - Constellation
20:35:47.2 +49°18'58.8" - Cygnus
Suspected nature of object
Reflection nebula
Description
A northeast-southwest elongated, irregular (reflection) nebula southwest of the mag. 8.0 K0 star SAO49842.
Date, plate or visually
17 August 2023, plate
158
R.A. / Dec. - Constellation
20:38:58.9 +51°39'30.6" - Cygnus
Suspected nature of object
Reflection nebula?
Description
A very small, slightly east-west elongated, rectangular nebula directly east-southeast of the mag. 11.6 star TYC3586-00666-1.
Date, plate or visually
17 August 2023, plate
159
R.A. / Dec. - Constellation
21:06:00.3 +62°55'20.1" - Cepheus
Suspected nature of object
Reflection nebula
Description
Nebulostiy surrounding the K5 mag. 7.1 star SAO19193, most prominent directly northeast of the star.
Date, plate or visually
17 August 2023, plate
160
R.A. / Dec. - Constellation
11:22:50.6 +38°32'40.9" - Ursa Major
Suspected nature of object
Galaxy
Description
A small, slightly elongated galaxy directly north-northwest of the mag. 9.5 M5 star SAO62523. On SDSS imagery, the galaxy is hidden in the glare of the star.
Date, plate or visually
18 August 2023, plate
161
R.A. / Dec. - Constellation
11:28:24.7 +04°19'47.0" - Leo
Suspected nature of object
Galaxy
Description
An extremely small but moderately bright galaxy 8" north of the mag. 12.9 star 4UCAC472-045515.
Date, plate or visually
18 August 2023, plate
162
R.A. / Dec. - Constellation
19:29:55.5 +18°21'53.7" - Sagitta
Suspected nature of object
Reflection nebula
Description
A very small reflection nebula surrounding the mag. 13.1 star 4UCAC542-094359. On the northwestern edge of the dark nebula Lynds 727 that involves the emission nebula Cederblad 168.
Date, plate or visually
21 August 2023, plate
163
R.A. / Dec. - Constellation
19:47:13.5 +18°55'00.2" - Sagitta
Suspected nature of object
Reflection nebula
Description
A small (annular?) reflection nebula surrounding the mag. 16.2 star 4UCAC545-104513, involved in or superimposed over the molecular cloud PGCC G056.07-03.16.
Date, plate or visually
21 August 2023, plate
164
R.A. / Dec. - Constellation
15:19:26.4 -25°11'33.3" - Libra
Suspected nature of object
?
Description
An irregular blob, larger outer halo suspected. Not visible in IR.
Date, plate or visually
21 August 2023, plate
165
R.A. / Dec. - Constellation
00:31:23.9 +62°37'44.5" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small reflection nebula surrounding the mag. 12.9 star 4UCAC764-007057, 3' northeast is nr. 72.
On the northeastern edge of the large, irregular and extremely faint emission nebula Sharpless 1-124.
Date, plate or visually
23 August 2023, plate
166
R.A. / Dec. - Constellation
23:58:19.4 +65°21'59.9" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small reflection nebula surrounding the mag. 13.2 star 4UCAC777-052919.
Date, plate or visually
23 August 2023, plate
167
R.A. / Dec. - Constellation
23:39:35.5 +64°38'47.2" - Cepheus
Suspected nature of object
Reflection nebula
Description
A very faint east-northeast - west-southwest elongated nebula southeast of mag. 11.3 star TYC4288-00202-1. 3.5' East-southeast of nr. 168.
Date, plate or visually
23 August 2023, plate
168
R.A. / Dec. - Constellation
23:39:04.1 +64°39'32.2" - Cepheus
Suspected nature of object
Reflection nebula
Description
A very small and faint nebula to the of the mag. 9.9 star TYC4288-00090-1. 3.5' West-northwest of nr. 167.
Date, plate or visually
23 August 2023, plate
169
R.A. / Dec. - Constellation
22:57:20.9 +66°03'01.4" - Cepheus
Suspected nature of object
Reflection nebula
Description
Very faint, surrounding the mag. 8.8 G0 star SAO20340.
Date, plate or visually
23 August 2023, plate
170
R.A. / Dec. - Constellation
20:50:45 +56°40'45" - Cepheus
Suspected nature of object
Reflection nebula
Description
Irregular, surrounding the mag. 10.2 star TYC3959-01045-1. South-southeast of the the nebula Cederblad 184.
Date, plate or visually
25 August 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
171
R.A. / Dec. - Constellation
22:09:52.0 +63°31'30.3" - Cepheus
Suspected nature of object
Reflection nebula
Description
A small and faint nebulous spike extending southwest of the mag. 10.4 star TYC4267-00225-1.
Date, plate or visually
25 August 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
172
R.A. / Dec. - Constellation
22:52:23.4 +70°50'48.7" - Cepheus
Suspected nature of object
Reflection nebula
Description
A small and faint nebulous spike extending west-southwest of the mag. 9.3 star SAO10525.
Date, plate or visually
25 August 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
173
R.A. / Dec. - Constellation
21:25:53.1 +74°44'29.0" - Cepheus
Suspected nature of object
Reflection nebula
Description
A very faint, north-northwest - south-southeast elongated band of nebulosity, NE of the stars TYC4473-01073-1 & TYC4473-00129-1. SDDS image hints of nebulosity surrounding these 2 stars, too, forming a "nr. 6" shape.
Date, plate or visually
27 August 2023, plate
10' DSS POSS2 Blue
10' SDSS
174
R.A. / Dec. - Constellation
21:57:08 +67°22'30" - Cepheus
Suspected nature of object
Emission nebula
Description
A very faint, irregular nebula, several faint stars on the northern edge. Nr. 175 is 11' south-southeast, nr. 176 is 11' west-northwest, nr. 177 is 11' north-northwest.
Date, plate or visually
27 August 2023, plate
10' DSS POSS2 Red
10' DSS POSS1 Red
175
R.A. / Dec. - Constellation
21:58:00 +67°12'30" - Cepheus
Suspected nature of object
Emission nebula
Description
North south elongated blotted nebulosity, approximately 10' north to south, fainter nebulosity to east and west. Brightest parts northwest of the double star HJ1711 (WDS21576+6708). Nr. 174 is 11' north-northwest.
Date, plate or visually
27 August 2023, plate
20' DSS POSS2 Red
20' DSS POSS1 Red
176
R.A. / Dec. - Constellation
21:55:15.8 +67°25'00.0" - Cepheus
Suspected nature of object
Emission nebula
Description
A northeast-southwest elongated, irregular nebula. 11' East-southeast is nr. 174, 11' northeast is nr. 177.
Date, plate or visually
27 August 2023, plate
10' DSS POSS2 Red
10' DSS POSS1 Red
177
R.A. / Dec. - Constellation
21:56:38 +67°33'15" - Cepheus
Suspected nature of object
Emission nebula
Description
A north-south elongated, filamentary nebula. 11' South-southeast is nr. 174, 11' southwest is nr. 176.
Date, plate or visually
27 August 2023, plate
10' DSS POSS2 Red
10' DSS POSS1 Red
178
R.A. / Dec. - Constellation
21:50:52.8 +68°48'16.3" - Cepheus
Suspected nature of object
Galaxy
Description
A small (spiral) galaxy, approximately 0.3'×0.2' in size.
Date, plate or visually
27 August 2023, plate
5' DSS POSS2 Blue
5' DSS POSS2 Red
179
R.A. / Dec. - Constellation
21:49:06.0 +68°58'31.5" - Cepheus
Suspected nature of object
?
Description
An irregular, undetermined nebulous blob to the east of a faint star. The brightest part of on the eastern side, elongated east to west. A fainter part appears to extend northeastwards from the star.
Date, plate or visually
27 August 2023, plate
5' DSS POSS2 Blue
5' PanSTARRS
5' DSS POSS2 Red
180
R.A. / Dec. - Constellation
22:12:34.5 +70°10'45.0" - Cepheus
Suspected nature of object
Nebula
Description
A detached, northwest-southeast elongated streak, approximately 5' in length, 6' southwest of the reflection nebula Cederblad 201.
Date, plate or visually
29 August 2023, plate
15' DSS POSS2 Blue
15' DSS POSS2 Red
181
R.A. / Dec. - Constellation
22:39:33.6 +71°49'15.0" - Cepheus
Suspected nature of object
Reflection nebula
Description
A small, west-southwest - east-northeast elongated streak north-northwest of the mag. 9.9 star TYC4484-00910-1.
Date, plate or visually
31 August 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
182
R.A. / Dec. - Constellation
22:55:31.3 +71°34'51.0" - Cepheus
Suspected nature of object
?
Description
A north-northeast - south-southwest elongated, irregular blob.
Date, plate or visually
31 August 2023, plate
10' DSS POSS2 Blue
10' PanSTARRS
10' DSS POSS2 Red
183
R.A. / Dec. - Constellation
22:49:03.6 +73°36'25.0" - Cepheus
Suspected nature of object
Reflection nebula
Description
A small, east to west elongated nebula west of the mag. 9.4 F0 star SAO10509.
Date, plate or visually
31 August 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
184
R.A. / Dec. - Constellation
16:01:58.7 +84°54'15.0" - Ursa Minor
Suspected nature of object
Galaxy
Description
A Magellanic spiral galaxy
Date, plate or visually
31 August 2023, plate
5' DSS POSS2 Blue
5' PanSTARRS
5' DSS POSS2 Red
185
R.A. / Dec. - Constellation
22:19:02.5 +61°36'22.0" - Cepheus
Suspected nature of object
Nebula
Description
A cometary nebula? Elongated east-southeast to west-northwest, brightest in eastern part.
Date, plate or visually
1 September 2023, plate
5' DSS POSS2 Blue
5' PanSTARRS
5' DSS POSS2 Red
186
R.A. / Dec. - Constellation
22:17:28.5 +61°43'02.0" - Cepheus
Suspected nature of object
Nebula
Description
Circular shape, brightest on western side. On eastern edge of the dark nebula DOBASHI 3296. 3' Southwest is nr. 187.
Date, plate or visually
1 September 2023, plate
10' DSS POSS2 Blue
10' PanSTARRS
10' DSS POSS2 Red
187
R.A. / Dec. - Constellation
22:17:09.6 +61°41'11.6" - Cepheus
Suspected nature of object
Reflection nebula
Description
Surrounding the mag. 14.0 star 4UCAC759-067886. 3' Northwest is nr. 186.
Date, plate or visually
1 September 2023, plate
10' DSS POSS2 Blue
10' PanSTARRS
10' DSS POSS2 Red
188
R.A. / Dec. - Constellation
22:28:51.7 +62°48'55.0" - Cepheus
Suspected nature of object
Nebula
Description
Nebula? Planetary nebula? An extremely faint, irregularly round glow, slightly elongated north to south, approximately 50" in size north to south.
Date, plate or visually
1 September 2023, plate
10' DSS POSS2 Blue
10' PanSTARRS
10' DSS POSS2 Red
189
R.A. / Dec. - Constellation
06:58:26.4 +74°34'05.0" - Camelopardalis
Suspected nature of object
Galaxy
Description
A small, irregular blob, brightest on eastern side in north-northwest to south-southeast elongated part.
Date, plate or visually
2 September 2023, plate
5' DSS POSS2 Blue
5' DSS POSS1 Blue
5' PanSTARRS
190
R.A. / Dec. - Constellation
22:32:32.5 +58°24'56.5" - Cepheus
Suspected nature of object
Emission nebula
Description
A very faint, irregular emission nebula, fanning out towards the northeast, approximately 90"×60" in size. Possibly a brighter part of a larger complex. 4' South-southwest of the emission nebula Sharpless 1-93.
Date, plate or visually
4 September 2023, plate
10' DSS POSS2 Red
10' DSS POSS1 Red
191
R.A. / Dec. - Constellation
22:32:14 +57°54'40" - Cepheus
Suspected nature of object
Emission nebula
Description
A relatively large and bright (emission) nebula, slightly elongated north to south, approximately 90"×60" in size, brightest in southern part.
Date, plate or visually
4 September 2023, plate
10' DSS POSS2 Red
10' DSS POSS2 Blue
192
R.A. / Dec. - Constellation
22:42:22 +60°28'00" - Cepheus
Suspected nature of object
Reflection nebula
Description
A west-southwest to east-northeast elongated streak, east-southeast of the mag. 10.6 star TYC4265-00541-1.
Date, plate or visually
4 September 2023, plate
10' DSS POSS2 Blue
10' PanSTARRS
10' DSS POSS1 Blue
193
R.A. / Dec. - Constellation
22:30:46.5 +61°43'58.0" - Cepheus
Suspected nature of object
Nebula
Description
A small west-southwest - east-northeast elongated streak, south-southeast of the mag. 8.8 K2 star SAO20120.
Date, plate or visually
4 September 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
194
R.A. / Dec. - Constellation
23:58:51 +60°44'46" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
A small and faint nebula north-northeast of the mag. 9.1 F5 star SAO20972.
Date, plate or visually
7 September 2023, plate
10' DSS POSS2 Blue
10' DSS POSS1 Blue
195
R.A. / Dec. - Constellation
23:42:13 +64°33'37" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
Small and very faint with a curved shape, northwest of the mag. 11.5 star 4UCAC773-061463.
Date, plate or visually
8 September 2023, plate
5' DSS POSS2 Blue
5' DSS POSS1 Blue
196
R.A. / Dec. - Constellation
23:25:51.8 +62°54'22.4" - Cassiopeia
Suspected nature of object
Nebula
Description
A relatively large nebula surrounding the mag. 10.6 star TYC4284-00447-1, most prominent to the east of the star.
Date, plate or visually
8 September 2023, plate
15' DSS POSS2 Red
15' DSS POSS1 Red
197
R.A. / Dec. - Constellation
00:05:00 +58°35'20" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
An extremely faint, east-west elongated band of nebulosity 3.5' north of the mag. 6.5 B3 star SAO21062 (component A of the double star STF3057 - WDS00049-5832).
Date, plate or visually
9 September 2023, plate
15' DSS POSS2 Blue
15' DSS POSS1 Blue
198
R.A. / Dec. - Constellation
08:52:52.6 +72°25'42.0" - Ursa Major
Suspected nature of object
Galaxy
Description
A spiral galaxy, 20" south-southeast of the mag. 10.3 star TYC4378-00170-1.
Date, plate or visually
9 September 2023, plate
10' DSS POSS2 Blue
10' DSS POSS2 Red
199
R.A. / Dec. - Constellation
03:24:03 +75°15'24" - Cassiopeia
Suspected nature of object
Nebula
Description
A relatively large, irregular, rectangularly shape nebula, approximately 3.5' in size.
Date, plate or visually
9 September 2023, plate
15' DSS POSS2 Blue
15' PanSTARRS
15' DSS POSS2 Red
200
R.A. / Dec. - Constellation
23:17:58.4 +61°48'47.4" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
Surrounding the mag. 11.8 star TYC4279-00185-1, on the northeastern edge of the large emission nebula Simeis 100.
Date, plate or visually
12 September 2023, plate
15' DSS POSS2 Blue
15' DSS POSS1 Blue
