David's Astronomy Pages CCD Images - Session 676 (2019-04-22)

Images (S675)

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Images (S677)

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Session Notes

46P/Wirtanen - Comet     Photometric Monitoring - Variables   - AM CVn, SY Cnc, R CrB, SS Her, CY Lyr AM CVn & RR Tau attempts failed     Astrometric Monitoring - Nearby Stars  - CN Leo

- Late evening / night session,  Duration 2.1hr Session operated in  fully automated mode, and monitored over remote connection for first part. After a promising start the observatory computer crashed leaving the observatory open. Upon automated restart of the computer the AstroProtect service intervened to automatically close down the observatory (include closing the shutter and parking both the dome and the telescope) - Main aim of the session was general observing with mix of variable stars, nearby stars, comets and deep sky targets.      - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:  7.0°C (min) - CCD Temperature:  -15°C  & -18°C  (100% av. power) - Notes from 2019-04-22 >>

46P/Wirtanen - Comet

46P/Wirtanen - 2019-04-22 (passing through Leo Minor) Sun Distance 1.91 AU Earth Distance 1.28 AU (191.0 million km) No sign of comet at expected position (indicated by white circle) (exposure is almost certaintly too short to see comet given its catalog mag of +18.7 )		Similarly no sign of comet at expected position in an image (not shown) that stacks 40 x 15s frames (total exposure 10 minutes)
Annotated CCD Image (50% size, linear scale) 3 x 15s exposure (average combine), 3x3 binning, C Filter 2019-04-22 22:53 UT (#676090-92) 12" LX200R (at f/10.4) + ST-10XME
More Images of 46P/Wirtanen
46P/Wirtanen - Earlier Image (2019-03-23) (passing through Leo Minor) Sun Distance 1.65 AU Earth Distance 0.83 AU (123.6 million km)		46P/Wirtanen -- Earlier Detail (2019-03-23)
Annotated CCD Image (50% size, linear scale) 10 x 15s exposure (average combine), 3x3 binning, C Filter 2019-03-23 21:54 UT (#675013-22) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		CCD Image (100% size, linear scale) Image details as left
46P/Wirtanen  - Earlier Image (2018-12-16) (passing through Taurus) Near to point of closest distance from earth Sun Distance 1.06 AU Earth Distance 0.08 AU (11.6 million km)		46P/Wirtanen  - Earlier Detail (2018-12-16)
CCD Image (50% size, linear scale) 15s exposure (single frame), 3x3 binning, C Filter  2018-12-16 21:03 UT (#641184) 12" LX200R  (at f/10.4) + ST-10XME		CCD Image (50% size, log scale) 31 x 15s exposure (average combine), 3x3 binning, C Filter  2018-12-16 21:03 to 21:16 UT (#641184-222) 12" LX200R  (at f/10.4) + ST-10XME (Autoguided on comet using TS 80mm APO + ZWO ASI178MC & PHD2)

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