David's Astronomy Pages Images - Session 1213 (2024-04-30)

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Objects	Session Notes
C/2023 A3 (Tsuchinshan-ATLAS) - Comet     GSC 3055:1155 - RR Type Variable (AT 2022evv) AT 2024crd - Type Nova? Transient         Variable Stars (photometric monitoring) - AT 2022evv      Nearby Stars (astrometric monitoring) - None	- Post-Midnight Session (3.0 hrs)     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 8°C (min) - CCD Temperature:   -15°C - Notes from 2024-04-30 >>     - Aurora Images/Video from night, 2024-04-30 >>

Observing Result

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C/2023 A3 (Tsuchinshan-ATLAS) - Comet

C/2023 A3 (Tsuchinshan-ATLAS) - 2024-04-30 (passing through Virgo) Sun Distance 2.77 AU (approaching) Earth Distance 1.81 AU (270.3 million km)		C/2023 A3 (Tsuchinshan-ATLAS) - 2024-04-30 Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -103.36 arcsec/hr, Dec 22.19 arcsec/hr)
Annotated CCD Image (50% size, log scale) 60s exposure (single frame), 3x3 binning, Clear Filter 2024-04-30 23:39 UT (#1213006) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (100% size, log scale, cropped) 11 x 60s exposure (average combine), 3x3 binning, Clear Filter 2024-04-30 23:46 UT (#1213006-16) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
C/2023 A3 (Tsuchinshan-ATLAS) - 2024-04-30		C/2023 A3 (Tsuchinshan-ATLAS) - 2024-04-30
False Color CCD Image (50% size, log scale) 11 x 60s exposure (average combine), 3x3 binning, Clear Filter 2024-04-30 23:46 UT (#1213006-16) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		False Color CCD Image (100% size, log scale, cropped) Image details as left
Images of C/2023 A3 Tsuchinshan-ATLAS on Comets 2024 Page >>

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GSC 3055:1155 - RR Type Variable (AT 2022evv)

AT 2022evv (Bootes) AT 2022evv (Type: CV) discovered 2022-03-16.697 UT by MASTER Alias: MASTER OT J153156.85+405008.7, GSC 3055:1155 Identified in Aladin/Simbad as 2MASS J15315678+4050075, a RR Type variable with a 1 mag variability over 1 hour Discovery magnitude 15.7 (vs non-detection at mag limit of 18.5 in 2018-05-16)  ( TNS 2022evv )

GSC 3055:1155 (AT 2022evv) - Reference Image GSC 3055:1155 (AT 2022evv, Variable Star) GSC 3055:1010 (Calibration Star,  V Mag 10.34) GSC 3055:1197 (Check Star)

Annotated CCD Image (70% size, linear scale) 5 x 60s exposure (average combine), 3x3 binning, V Filter 2024-05-01 00:13 UT (#1213026-30) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

GSC 3055:1155 (AT 2022evv) - Time Series Plot - V Magnitude 2024-05-01 00:11 to 02:08 UT Data confirms variability in brightness of GSC 3055:1155 with a 1.2 mag increase in 1 hour Time series is not long enough to define a period, but it could be consistent with a RR Type Variable Target to be reschedule target for a longer time series at a future date

Points,  60s exposure, 3x3 binning, V Filter

AT 2022evv - 2024-05-01 (T+776.3d) Image below (2024-05-01.007) was taken 776.3 days after discovery of 2022evv Position of transient (visible) is shown by white cross-hairs Measured magnitude +15.29 (V Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, V Filter 2024-05-01 00:13 UT (#1213026-30) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2022evv -  Previous Image 2023-01-05 (T+294.5d) Image below (2023-01-05.247) was taken 294.5 days after discovery of 2022evv Position of transient (visible) is shown by white cross-hairs Measured magnitude +15.07 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2023-01-05 05:58 UT (#1082226-30) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2022evv on Transients 2022 Page

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AT 2024crd - Type Nova? Transient

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