Observation by Tim Haymes: Optical transient - not so transient?

Uploaded by

Tim Haymes

Observer

Tim Haymes

Observed

2023 Aug 08 - 23:46

Uploaded

2023 Aug 09 - 13:59

Objects

ε-UMi
Variable star

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Constellation

Ursa Minor

Field centre

RA: 16^h43^m
Dec: +81°56'
Position angle: +2°01'

Field size

0°24' × 0°15'

Equipment

C11 at F5.8
QHY174mGPS
EQ8

Exposure

30s x 12 subs

Location

N Oxfordshire

Target name

AN 2023omg

Title

Optical transient - not so transient?

About this image

The object has faded by about 0.4 mag (unfiltered) since 2023-08-06. Now 13.7 R. Dark and flat corrected, measured in Astrometrica (UCAC4). Still not sure what this ZTF discovery is. Anyone know?

Previous image of mine here: https://britastro.org/observations/observation.php?id=20230806_111803_5bcc742c37969fde

Files associated with this observation

AT 2023omg_20230808_2345_thaymes.jpg (277.7 kB)

Like this image

Robin Leadbeater, Jeremy Shears

Comments

Robin Leadbeater, 2023 Aug 09 - 14:26 UTC

Hi Tim,

It is a dwarf nova. (WZ Sge)

http://ooruri.kusastro.kyoto-u.ac.jp/mailman3/hyperkitty/list/vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp/thread/26IEDCYY5BKWH57W4JQLJK5SCK7UYJPG/

Here is my spectrum taken last night showing narrow H alpha emission and other Balmer lines in broad absorption, typical of a dwarf nova outburst

https://britastro.org/specdb/data_graph.php?obs_id=14306

Actually the although the ZTF detection date is earlier they did not make this public on TNS for several days so I would say the discoverers would officially be according the report on TOCP

http://www.cbat.eps.harvard.edu/unconf/followups/J16420534+8156125.html

(Stanislav Korotkiy (Astroverty, Ka-Dar), Kirill Sokolovsky (UIUC, SAI MSU), Olga Smolyankina (Observatory of Omsk CPCT), Anna Prokudina, Sergei Ostapenko)

Cheers

Robin

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