AAVSO: American Association of Variable Star Observers

Proposal #50

Proposer (4873) Stan Howerton (showerton1@outlook.com) obscode: HSW
Assigned To(3865) Elizabeth Waagen
Date SubmittedMarch 18, 2015

The object I wish to image is the recently found supernova SNhunt281 in NGC 5839. I discovered this object through CRTS SNhunt on Catalina Sky Survey images. As the Catalina Sky Survey does not image the same areas each night it would not be possible to constrain the date of maximum. This is a sub-luminous Type Ia supernova in a relatively nearby galaxy (z = 0.0041). Per ATel 7251 it is believed to be about 5 days before maximum at the time of their confirmation. If it is similar to SN 1991bg as per their confirmation, the object would peak around magnitude 14.1. I wish to get BVR images each night from March 19 to April 3. Two exposures of 180 seconds in each filter should be sufficient. If time constraints prevent availability in all filters and the object could only be imaged in one filter please use V. The object was magnitude 19.2 unfiltered at discovery on March 16, but I'm estimating it should be around 17th magnitude by now. If possible I would prefer SRO to be used, but as the object is near the equator and if another observatory is better available or suited for the task that would be fine.
Stan Howerton
Arkansas City, Kansas

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
SNhunt281 15.091667 1.63389 17.0–14.1 SRO No


(4873) Stan Howerton — March 20, 2015, 11:20 p.m.

The supernova was 16.2 on March 19. Would like to extend the series into mid-April to catch part of the decline, if possible.

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