David's Astronomy Pages CCD Images - Session 940 (2021-12-10)

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AT2021abed - Type ulens? Transient 10P/Tempel - Comet      Variable Stars (photometric monitoring) - None      Nearby Stars (astrometric monitoring) - None

- Evening session 5.6 hours - First Session using new Observatory Computer (due to failure of previous computer in last session, 2021-12-05) -   Only 2 targets were successfully imaged during session.   This was due to a show-stopping 'SideOfPier' issue when trying to guide on targets lying west of Meridian due to Guide Calibration being flipped. - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: -3°C (min) - CCD Temperature:  -25°C - Notes from 2021-12-10 >>    [ Local Files >> ]

AT2021abed - Type ulens? Transient

AT2021abed (Camelopardalis) AT2021abed (Type: ulens?) discovered 2021-10-06.764 UT by Gaia Alias: Gaia21epq Tranisent alert triggered by Gaia at mag +14.2 compared to a historic mag value of + 14.49  [ Gaia21epq ]

Annotated CCD Image  (50% size, square root scale) 4 x 180s exposure (average combine), 3x3 binning, C Filter 2021-12-10 20:42 UT (#940004-07) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT2021abed - Detail Image below (2021-12-10.857) was taken 65.1 days after discovery of 2021abed

Annotated CCD Image (125% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, C Filter 2021-12-10 20:42 UT (#940004-07) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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10P/Tempel - Comet

10P/Tempel  (passing through Taurus) Sun Distance 2.73 AU  (receeding) Earth Distance 1.80 AU (269.4 million km) Position of comet shown by white cross-hairs		10P/Tempel - 2021-12-05, Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -33.53 arcsec/hr, Dec 7.17 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 180s exposure (average combine), 3x3 binning, C Filter 2021-12-10 20:59 UT (#940012-14) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		CCD Image (100% size, square root scale, cropped)  Image details as left
Images of 10P/Tempel on Comets 2021 Page >>

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