Discoveries 126 - 150
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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126 - 127 - 128 - 129 - 130 - 131 - 132 - 133 - 134 - 135 - 136 - 137 - 138 - 139 - 140 - 141 - 142 - 143 - 144 - 145 - 146 - 147 - 148 - 149 - 150
1-25 - 26-50 - 51-75 - 76-100 - 101-125 - 151-175 - 176-200 - 201-225 - 226-250 - 251-275 - 276-300 - 301 and further
126
R.A. / Dec. - Constellation
03:59:40 +38°49'13" - Perseus
Suspected nature of object
Reflection nebula
Description
Streaks of nebulosity, SE to NW, surrounding the double star STT69 (WDS03597+3849).
Date, plate or visually
2 February 2023, plate
127
R.A. / Dec. - Constellation
20:33:17.6 -80°57'53.6" - Octans
Suspected nature of object
Reflection nebula
Description
A relatively large nebula surrounding the double star HJ5182 (WDS20333-8058), component A shining bright at mag. 5.9, spectrum G6 or K0. The DECaLS DR10 image reveals that this may be the brighter part of a much larger elongated nebula.
Date, plate or visually
10 February 2023, plate
128
R.A. / Dec. - Constellation
19:36:54 -81°57'50" - Octans
Suspected nature of object
Nebula
Description
An irregular blob, approximately 4' in size, possibly brighter part of larger complex.
Date, plate or visually
10 February 2023, plate
15' DECaLS DR10
129
R.A. / Dec. - Constellation
12:02:20 -85°37'54" - Octans
Suspected nature of object
Reflection nebula
Description
A suspected reflection nebula surrounding the mag. 5.9 K2 star SAO258632 (double star HJ4490 - WDS12023-8538).
Note that the orientation in the POSS images below does not match.
Date, plate or visually
10 February 2023, plate
15' DSS POSS2 Blue - 1977
130
R.A. / Dec. - Constellation
06:09:11 +07°03'45" - Orion
Suspected nature of object
Asterism or open cluster
Description
A detached group of 15-20 stars, mostly mag. 11 and fainter, approximately 5' in size. Brightest star is the double star STF856 (WDS06091+0703), southwest of the middle.
Date, plate or visually
14 February 2023, visually
131
R.A. / Dec. - Constellation
06:16:42.8 -08°59'16.3" - Monoceros
Suspected nature of object
Reflection nebula
Description
Surrounding the star mag. 16.2 star 4UCAC406-012793. 2.5' North-northwest of the reflection nebula GN 06.14.4.
Date, plate or visually
18 February 2023, plate
15' PanSTARRS
132
R.A. / Dec. - Constellation
06:16:28.0 -08°56'40.2" - Monoceros
Suspected nature of object
Reflection nebula
Description
Surrounding the mag. 11.2 star TYC5363-00678-1. 7' Northwest of the reflection nebula GN 06.14.4.
Date, plate or visually
18 February 2023, plate
15' PanSTARRS
133
R.A. / Dec. - Constellation
06:56:07.0 -08°32'46.9" - Monoceros
Suspected nature of object
Nebula
Description
A nebulous spike extending south-southeast from the mag. 8.7 K0 star SAO133913. Some fainter extended nebulosity directly northwest of the star. On the southwestern edge of the dark nebula Lynds 1656.
Date, plate or visually
19 February 2023, plate
134
R.A. / Dec. - Constellation
22:06:25.5 +88°03'07.7" - Ursa Minor
Suspected nature of object
Galaxy
Description
A small and faint, east-west elongated galaxy, approximately 0.6'×0.2' in size. 2' Southeast of the mag. 7.4 star SAO3714.
The images below are rotated from true north and do not match in orientation.
Date, plate or visually
20 February 2023, plate
135
R.A. / Dec. - Constellation
23:53:38.2 +71°29'26.0" - Cepheus
Suspected nature of object
Reflection nebula
Description
A faint (reflection) nebula surrounding the mag. 9.0 A0 star SAO10886. East of the star is a small, brighter blob of nebulosity.
Date, plate or visually
20 February 2023, plate
136
R.A. / Dec. - Constellation
06:55:01 -07°53'00" - Monoceros
Suspected nature of object
Asterism or open cluster
Description
A detached group of stars, slightly elongated north to south, approximately 7'×5' in size. Brightest star on the northern edge is mag. 8.8 SAO133891.
9' Minutes of arc to the southeast is the faint emission nebula Strohmeier 20.
Date, plate or visually
26 February 2023, plate
137
R.A. / Dec. - Constellation
08:11:02 -07°45'00" - Monoceros
Suspected nature of object
Emission nebula
Description
A relatively large and bright (emission?) nebula on the border of the constellations of Monoceros and Hydra, 7 minutes of arc west of the mag. 5.4 star SAO135611 in Hydra. Irregular and elongated NNW-SSE. On the NNW edge is the mag. 10.8 star TYC5426-00183-1. Could be a brighter part of a much larger (complex of) nebula(e) extending eastwards.
Date, plate or visually
7 March 2023, plate
15' SDSS
138
R.A. / Dec. - Constellation
15:06:40.75 -19°24'22" - Libra
Suspected nature of object
Galaxy group
Description
A small group of 12 or more galaxies(?), approximately 23 seconds of arc north to south, shaped like the letter "E" or a reversed number "3".
Date, plate or visually
9 March 2023, plate
5' PanSTARRS
5' DECaLS
DECaLS cropped
139
R.A. / Dec. - Constellation
22:53:42.4 +79°04'19.9" - Cepheus
Suspected nature of object
Reflection nebula
Description
North-south elongated drapes of nebulosity west of the mag. 8.3 star SAO10537. 46' South-southeast of nr. 140.
Date, plate or visually
16 March 2023, plate
140
R.A. / Dec. - Constellation
22:46:23.4 +79°47'03.0" - Cepheus
Suspected nature of object
Reflection nebula
Description
Faint, north-south elongated nebulosity west of the mag. 9.4 star SAO10498. 46' North-northwest of nr. 139.
"The Toothbrush Nebula", as I noted this little nebula on Blue POSS imagery while brushing my teeth.
Date, plate or visually
17 March 2023, plate
141
R.A. / Dec. - Constellation
23:02:32.7 +69°21'05.1" - Cepheus
Suspected nature of object
Reflection nebula
Description
Extremely faint, north-northwest to south-southeast elongated nebulosity southwest of the mag. 9.8 star TYC4477-00098-1.
Date, plate or visually
17 March 2023, plate
142
R.A. / Dec. - Constellation
01:18:29.9 +73°23'02.3" - Cassiopeia
Suspected nature of object
Reflection nebula
Description
Faint nebulosity surrounding the mag. 8.3 star SAO4370, most prominent north of the star in a brighter east-west elongated part.
Date, plate or visually
17 March 2023, plate
143
R.A. / Dec. - Constellation
05:12:27.0 +72°44'37.1" - Camelopardalis
Suspected nature of object
Reflection nebula
Description
Very faint nebulosity surrounding the mag. 8.0 star SAO5457, brightest south of the star in an east-northeast to west-southwest elongated part.
Date, plate or visually
17 March 2023, plate
144
R.A. / Dec. - Constellation
09:15:04.0 +72°43'00" - Ursa Major
Suspected nature of object
Nebula
Description
Large, faint, east-northeast to west-southwest orientated layers of nebulosity, approximately half a degree in size. South of the mag. 5.9 star SAO6792. Fainter nebulosity is farther to the south and southwest.
Date, plate or visually
17 March 2023, plate
145
R.A. / Dec. - Constellation
16:20:03.4 +04°00'20.2" - Hercules
Suspected nature of object
?
Description
A jet that, visually, appears to be emanating southwards from the known galaxy SDSS J162003.67+040040.3. Elongated north to south with a curved shape, the brightest part approximately 35" in length.
May be extending further towards the east and thereby forming part of a bubble-shape.
Date, plate or visually
31 March 2023, plate
146
R.A. / Dec. - Constellation
19:45:40 +54°19'00" - Cygnus
Suspected nature of object
Nebula
Description
A very faint, irregular, west-southwest to east-northeast elongated nebula, southwest of the mag. star 6.8 star SAO31979. Approximately 15'×7' in size.
Date, plate or visually
1 April 2023, plate
147
R.A. / Dec. - Constellation
21:21:58 +72°03'33" - Cepheus
Suspected nature of object
Reflection nebula
Description
Nebula surrounding the mag. 7.0 star SAO10032, 18' south-southeast of nr. 148.
Date, plate or visually
24 April 2023, plate
148
R.A. / Dec. - Constellation
21:20:22 +72°20'36" - Cepheus
Suspected nature of object
Reflection nebula
Description
A north-south elongated nebula surrounding the mag. 8.7 star SAO10023, 18' north-northwest of nr. 147.
Date, plate or visually
24 April 2023, plate
149
R.A. / Dec. - Constellation
21:03:36 +76°57'12" - Cepheus
Suspected nature of object
Reflection nebula
Description
Nebula surrounding the mag. 10.8 star TYC4590-00843-1, 10' southeast of the reflection nebula Bernes 47.
Date, plate or visually
24 April 2023, plate
150
R.A. / Dec. - Constellation
21:04:25 +73°31'00" - Cepheus
Suspected nature of object
Reflection nebula
Description
A small, east-west elongated nebula surrounding the mag. 11.0 star TYC4472-00272-1.
Date, plate or visually
25 April 2023, plate
