David's Astronomy Pages CCD Images - Session 900 (2021-06-05)

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Images (S901)

Objects	Session Notes
AT 2021bur - CV Type Transient     Variable Stars (photometric monitoring) - R CrB     Nearby Stars (astrometric monitoring) - Barnards Star	- Night session (0.4 hours) - Main aims of the session were to test latest AstroMain version and acquire a selection of variable star, nearby star, comet & deep sky targets. - Summer sky - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 10°C (min) - CCD Temperature:  -10°C - Notes from 2021-06-05 >>    [ Local Files >> ]   -

Observing Result

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AT 2021bur - CV Type Transient

AT 2021bur (Hercules) AT 2021bur (Type: CV) discovered 2021/02/04.117 UT by Gaia Alias: Gaia21apv Discovery Magnitude 15.97 (G-GaiaFilter) vs Historic Magnitude 17.10  +/- 0.42 SD Variable blue source brightens above previous level, GALEX detection, candidate CV ( TNS 2021bur | Gaia21apv )

AT 2021bur - 2021-06-05 (T+121.9d) Image below (2021-06-05.999) was taken 121.9 days after discovery of 2021bur Position of transient (faint) is indication by white cross-hairs Estimated Magnitude +16.2 (Clear Filter)

Annotated CCD Image (125% size, linear scale, cropped) 60s exposure (single frame), 3x3 binning, C Filter 2021-06-05 23:59 UT (#900022) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2021bur on Transients 2021 Page >>

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