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SN 2018gep.  September 12, 2018. | by watchingthesky16
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SN 2018gep. September 12, 2018.

SN 2018gep

Position: RA = 16h43m48.22, Decl. = +41d02m43.4s

Galaxy: SDSS J164348.22+410243.3

Discovered by: Zwicky Transient Facility (ZTF)

Discovery date: September 9, 2018

Type: Ib? overluminous

Constellation: Hercules

TNS entry:


Image data

Telescope: T21 in Mayhill, NM

Exposure: 3 x 120 seconds

Filter: Luminance

Magnitude: 16.10 +/- 0.02 with V as reference

Date: 2018 September 12.116

Comparison stars from APASS



1.ATel 12030 states this resembles SN 2018cow (which was initially thought to be a Type Ic-BL then Type Ib)

2.For my measurement of 16.1 that corresponds to an absolute magnitude of about –19.9 for the reported redshift of z = 0.033 per ATel 12030 and 0.03 magnitude of extinction.


Update September 13, 2018. I observed the supernova on the night of September 12 with the 17.5-inch. Estimated it at 15.9 and made a sketch of the field at 380x. Also, obtained robotic images last night, but have not yet posted them. Supernova was unchanged in brightness at 16.11 +/- 0.02 on the luminance stack (2018 September 13.131). Also, got images in Johnson V where it measured 16.14 +/- 0.04 (2018 September 13.138).


Update 9-14: Whoops forgot to change the name of the supernova when copying and pasted. This has been corrected.

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Uploaded on September 12, 2018