Asteroid, or supernova?

Sdss:

https://www.legacysurvey.org//viewer-dev/?ra=202.7585&dec=54.9325&layer=sdss&zoom=13&const
Legacy Surveys Dr9:
image
Edit: I do realize that this an elliptical galaxy and thus has a low amount of stars that could go supernova due to the lack of dust in the galaxy. But that doesn’t mean it’s impossible for this to be a supernova.

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The object is not reported in the TNS. Since JPL query is very uneasy with slowness and many entries to the query including the comversion of degrees to HMSDMS.

Any ideas @ine?

https://www.wis-tns.org/search?&discovered_period_value=1&discovered_period_units=months&unclassified_at=0&classified_sne=0&include_frb=0&name=&name_like=0&isTNS_AT=all&public=all&ra=%20202.7577&decl=%2054.9319&radius=&coords_unit=arcsec&reporting_groupid[]=null&groupid[]=null&classifier_groupid[]=null&objtype[]=null&at_type[]=null&date_start[date]=&date_end[date]=&discovery_mag_min=&discovery_mag_max=&internal_name=&discoverer=&classifier=&spectra_count=&redshift_min=&redshift_max=&hostname=&ext_catid=&ra_range_min=&ra_range_max=&decl_range_min=&decl_range_max=&discovery_instrument[]=null&classification_instrument[]=null&associated_groups[]=null&official_discovery=0&official_classification=0&at_rep_remarks=&class_rep_remarks=&frb_repeat=all&frb_repeater_of_objid=&frb_measured_redshift=0&frb_dm_range_min=&frb_dm_range_max=&frb_rm_range_min=&frb_rm_range_max=&frb_snr_range_min=&frb_snr_range_max=&frb_flux_range_min=&frb_flux_range_max=&num_page=50&display[redshift]=1&display[hostname]=1&display[host_redshift]=1&display[source_group_name]=1&display[classifying_source_group_name]=1&display[discovering_instrument_name]=0&display[classifing_instrument_name]=0&display[programs_name]=0&display[internal_name]=1&display[isTNS_AT]=0&display[public]=1&display[end_pop_period]=0&display[spectra_count]=1&display[discoverymag]=1&display[discmagfilter]=1&display[discoverydate]=1&display[discoverer]=1&display[remarks]=0&display[sources]=0&display[bibcode]=0&display[ext_catalogs]=0

For what it’s worth, SDSS has three separate exposures for this, and this object is visible in two of them –
MJD 52379 = 2002-04-15 (visible)
MJD 52402 = 2002-05-08 (fainter)
MJD 52708 = 2003-03-10 (gone)

https://dr12.sdss.org/fields/runCamcolField?run=3130&camcol=6&field=86
https://dr12.sdss.org/fields/runCamcolField?run=3180&camcol=6&field=18
https://dr12.sdss.org/fields/runCamcolField?run=3712&camcol=1&field=156

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Hi, :slightly_smiling_face:

Yes, I think this is a transient (supernova candidate)
What is important is that asteroids are excluded. You can do this via a manual search via the small body identification tool.

https://ssd.jpl.nasa.gov/tools/sb_ident.html#/

If you specify the observer location you have to select: Apache Point-Sloan Digital Sky Survey (observatory) [645]
Also check whether this transient has not already been reported in the RBS pages (Rochester Bright Supernovae)

To report responsibly you need at least two different dates on which the transient can be seen. One date of visibility is not good enough to report. Check if there is more than one date.

In this case the transient is visible in two SDSS CCDs.

https://dr12.sdss.org/fields/runCamcolField?run=3130&camcol=6&field=86

https://dr12.sdss.org/fields/runCamcolField?run=3180&camcol=6&field=18

There are fits files available in u,g,r,i,z band. You can open the fits files with, for example, APT (Aperture Photometry Program). In the fits headers of the fits files you will find the times and dates.

Ine :stars::dizzy:t

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