Discoveries 301 and further
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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302
R.A. / Dec. - Constellation
08:46:18 -42°01'30" - Vela
Suspected nature of object
Nebula? Supernova remnant?
Description
Irregular shards of nebulosity surrounding the mag. 9.6 B9 star SAO220246, covering approximately 8'. A prominent, irregular, twisted part of nebulosity is 2' to the southeast of the star.
8' South of the open cluster NGC2671.
Date, plate or visually
23 March 2024, plate
15' DECaPS DR2
15' DSS POSS2 Red
15' DSS POSS2 Blue
301
R.A. / Dec. - Constellation
20:29:20.4 +36°27'17.0" - Cygnus
Suspected nature of object
Reflection nebula
Description
Nebulosity surrounding the mag. 5.9 A0 star 42 Cygni; most prominent in an east to west elongated, filamentary part to the south of the star that on the western side loops back towards the east (via the south) and that is approximately 8' in length.
Date, plate or visually
17 March 2024, plate
20' DSS POSS2 Blue
20' DSS POSS1 Blue
20' PanSTARRS
