David's Astronomy Pages Images - Session 1212 (2024-04-26)

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Images (S1213)

Objects	Session Notes
C/2021 S3 (PANSTARRS) - Comet     AT 2024dsj - CV Type Transient     NGC 6433 - Spiral Galaxy with Type Ia Supernova 2024efn     UGC 11067 - Spiral Galaxy with Type II Supernova 2024grw     Variable Stars (photometric monitoring) - BL Lac      Nearby Stars (astrometric monitoring) - Groombridge 34	- Attempted All-Night Session (4.3 hrs), skies overcast or cloudy in first half of session and didn't clear until 02:10.     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 1°C (min) - CCD Temperature:   -20°/-25°C - Notes from 2024-04-26 >>     -

Observing Result

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C/2021 S3 (PANSTARRS) - Comet

C/2021 S3 (PANSTARRS) - 2024-04-27 (passing through Cygnus) Sun Distance 1.69 AU (receeding) Earth Distance 1.51 AU (225.8 million km)		C/2021 S3 (PANSTARRS) - 2024-04-27 Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 50.34 arcsec/hr, Dec 90.58 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 2 x 60s exposure (average combine), 3x3 binning, Clear Filter 2024-04-27 01:55 UT (#1212033-34) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		Annotated CCD Image (100% size, square root scale, cropped) 7 x 60s exposure (average combine), 3x3 binning, Clear Filter 2024-04-27 01:58 UT (#1212033-39) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of C/2021 S3 (PANSTARRS) on Comets 2024 Page >>

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AT 2024dsj - CV Type Transient

AT 2024dsj (Cassiopeia) AT 2024dsj (Type: CV) discovered 2024-02-28.787 UT by Gaia Alias: Gaia24ath Discovery Magnitude 15.25 (G-Gaia Filter) vs Historic Magnitude 15.03 +/- 0.02 SD  Gaia source fades by 0.2 mag TNS discovery report on TNS says Prior Non-Detection Limiting Mag 21.5 (2024-01-25 17:32) but Gaia data for the same date gives mag 15.26)  ( TNS 2024dsj | Gaia24ath )

AT 2024dsj - 2024-04-27 (T+58.3d) Image below (2024-04-27.059) was taken 58.3 days after discovery of 2024dsj Position of reported transient (faint, brightened slighly ?) is shown by white cross-hairs Measured Magnitude +14.37 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 60s exposure (average combine), 3x3 binning, Clear Filter 2024-04-27 01:28 UT (#1212012-16) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of AT 2024dsj on Transients 2024 Page >>

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NGC 6433 - Spiral Galaxy with Type Ia Supernova 2024efn

NGC 6433 with SN 2024efn (Hercules) SN 2024efn (Type: Ia) discovered 2024-03-12.496 UT by CRTS Alias: SNhunt463 Discovery Magnitude 19.0 (V-crts-CRTS Filter) vs Prior Non-Detection Limiting Magnitude 21.0  ( TNS 2024efn )

NGC 6433 with SN 2024efn - 2024-04-27 (T+45.6d) Image below (2024-04-27.090) was taken 45.6 days after discovery of 2024efn Position of reported supernova (fading slowly) is shown by white cross-hairs Measured Magnitude +16.12 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-04-27 02:17 UT (#1212042-46) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2024efn (in NGC 6433) on Supernova 2024 Page >>

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UGC 11067 - Spiral Galaxy with Type II Supernova 2024grw

UGC 11067 with SN 2024grw (Ophiuchus) SN 2024grw (Type: II) discovered 2024-04-16.821 UT by ATLAS Alias: ATLAS24fvu, Gaia24bit Discovery Magnitude 18.36 (orange-ATLAS Filter) vs Prior Non-Detection Limiting Magnitude 20.09 (ATLAS) vs Historic Magnitude 20.45 +/- 0.05 (Gaia) Gaia comment : Confirmed SN II Gaia, 2024-02-01 06:55, mag 20.44 Gaia, 2024-04-16 19:43, mag 18.60 Gaia, 2024-05-03 06:03, mag 17.49 It is likely that the SN's progenitor is not the same as Gaia's  historical object recorded at mag 20.45 +/- 0.05, which is likely a foreground star since  the brightening in magnitude (only 3 mag or so ) is not consistent with the 10 mag brightening that would be expected for a SN.  The real progenitor would be expected to lay at mag 27 or so.  ( TNS 2024grw | Gaia24bit )

UGC 11067 - Spiral Galaxy

Annotated CCD Image (50% size, square root scale) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-04-27 02:38 UT (#1212049-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 11067 with SN 2024grw - 2024-04-27 (T+10.0d) Image below (2024-04-27.104) was taken 10.0 days after discovery of 2024grw Position of reported transient (faint) is shown by white cross-hairs Measured Magnitude +16.94 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-04-27 02:38 UT (#1212049-52) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 11067 with SN 2024grw - Reference Image Position of reported supernova progenitor (not visible) is shown by mauve cross-hairs

Reference Image, DSS2 Colour image captured via Aladin

UGC 11067 with SN 2024grw - Reference Image, Detail Position of reported supernova progenitor is shown by mauve cross-hairs The faint object near to the position of the later supernova is likely to be a mag 20.4 foreground star, as the actual progenitor star (~ mag 27) wouldn't be expected to be visible in this image

Reference Image, PanSTARRS image captured via Aladin

Images of SN 2024grw (in UGC 11067) on Supernova 2024 Page >>

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