David's Astronomy Pages CCD Images - Session 915 (2021-09-21)

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Session Notes

67P/Churyumov-Gerasimenko - Comet 10P/Tempel - Comet  (Attempt) NGC 6184 - Spiral Galaxy with Type Ia Supernova 2021wkv AT2021wkx - Unconfirmed Transient in Galaxy WISEA J165817.77+644220.4 (PGC 2670810) Nova Cas 2021 - Nova (V1405 Cas) Nova Per 2020 - Nova (V1112 Per, AT2020abap)           Variable Stars (photometric monitoring) - TT Ari, S Cyg, SS Cyg, KIC 8462852, BL Lac,CY Lyr, RR Lyr, DY Per, GK Per      Nearby Stars (astrometric monitoring) - Barnards Star, DX Cnc, 61 Cyg, EV Lac, Teegardens Star

- Full night Session (8.8 hours). - Clear skies all night but poor seeing and moonlit - Main aims of the session were to acquire a selection of targets including  Comet 67P/Churyumov-Gerasimenko - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 12°C (min) - CCD Temperature:  -10°C - Notes from 2021-09-21 >>    [ Local Files >> ]   -

67P/Churyumov-Gerasimenko - Comet

67P/Churyumov-Gerasimenko (passing through Taurus) Sun Distance 1.31 AU Earth Distance 0.55 AU (82.0 million km)		67P/Churyumov-Gerasimenko - 2021-09-22, Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 154.55 arcsec/hr, Dec 41.33 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 3 x 45s exposure (average combine), 3x3 binning, C Filter 2021-09-22 02:02 UT (#915247-49) 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)  15 x 45s exposure (average combine), 3x3 binning, C Filter 2021-09-22 02:07 UT (#915247-61) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
Images of 67P/Churyumov-Gerasimenko on Comets 2021 Page >>

67P/Churyumov-Gerasimenko - False Colour Image(s)  Inverse Spectrum

67P/Churyumov-Gerasimenko - 2021-09-22

False Colour CCD Image (70% size, square root scale)  15 x 45s exposure (average combine), 3x3 binning, C Filter 2021-09-22 02:07 UT (#915247-61) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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10P/Tempel - Comet (Attempt)

10P/Tempel  (passing through Orion) Sun Distance 2.24 AU Earth Distance 1.76 AU (262.7 million km) Expected position of comet shown by white circle No indication of comet (too faint ?)		10P/Tempel - 2021-09-22, Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra 12.75 arcsec/hr, Dec -7.96 arcsec/hr) No indication of comet at its expected position.
Annotated CCD Image (50% size, square root scale) 7 x 45s exposure (average combine), 3x3 binning, C Filter 2021-09-22 04:09 UT (#915356-62) 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)  Image details as left
Images of 67P/Churyumov-Gerasimenko on Comets 2021 Page >>

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NGC 6184 - Spiral Galaxy with Type Ia Supernova 2021wkv

NGC 6184 with SN 2021wkv (Hercules) SN 2021wkv (Type: Ia, zhost=0.027329) discovered 2021/08/20.277 UT by ATLAS Alias: ATLAS21bgqy.  Magnitude +18.2 at discovery  (Rochester Supernova site )

NGC 6184 with SN 2021wkv - 2021-09-21 (T+32.6d) Image below (2021-09-21.831) was taken 32.6 days after discovery of 2021wkv SN position is shown by white cross-hairs. Measured mag ? (unable to resolve SN in CCDSoft/SExtractor)

Annotated CCD Image  (125% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-09-21 20:05 UT (#915009-13) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2021wkv (NGC 6184) on Supernovae 2021 Page >>

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AT2021wkx - Unconfirmed Transient in Galaxy WISEA J165817.77+644220.4 (PGC 2670810)

WISEA J165817.77+644220.4 with ? AT2021wkx (Hercules) AT2021wkx (Type: unk) discovered 2021-08-20.027 UT by MASTER Alias: MASTER OT J165819.02+644213.9  (Rochester Supernova site )

WISEA J165817.77+644220.4 & adjacent galaxies WISEA J165817.77+644220.4 (alias PGC 2670810)  (catalog mag + 16.5) PGC 2671502 (catalog mag +16.8), PGC 2671172 (catalog mag +17.8)

Annotated CCD Image  (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2021-09-21 20:46 UT (#915045-49) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

WISEA J165817.77+644220.4 with ? AT2021wkx - 2021-09-21 (T+32.8d) Image below (2021-09-21.858) was taken 32.8 days after reported discovery of AT 2021wkx Image compared with DSS2 Image in Aladin No indication of any transient  (transient is either too faint  or has faded) Transient is unconfirmed

Negative CCD Image  (125% size, square root scale, cropped) Image details as above

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Nova Per 2020 - Nova (V1112 Per, AT2020abap)

Nova Per 2020 (Perseus) Nova in Perseus discovered 2020/11/25.807 [ Novae ] Nova Per 2020 discovered independently by Seiji Ueda and Stanislav Korotkiy et al AT2020abap (Type: CV) reported 2020/11/27.230 UT by PGIR Alias: N Per 2020 , PGIR20fbf, TCP J04291888+4354233, TCP J04291884+4354232, V1112 Per

Nova Per 2020 - 2021-09-22 (T+300.2d) Image below (2021-09-22.025) was taken 300.2 days after discovery of nova Nova is shown by white cross hairs.  Measured magnitude +15.4 (falling slowly)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 90s exposure (average combine), 3x3 binning, C Filter 2021-09-22 00:41 UT (#915205-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of Nova Per 2020 on Novae Page >>

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Nova Cas 2021 - Nova (V1405 Cas)

Nova Cas 2021 (Cassiopeia) Nova in Cassiopeia discovered 2021-03-18.4236,  by Yuji Nakamura (Japan) Magnitude at discovery +9.6 (unfiltered CCD) AT2021hkn (Type: Nova) reported by 2021/03/30.055 UT by Gaia Alias: Gaia21bpe, AT2021hkn, V1405 Cas

Nova Cas 2021 / AT2021hkn - 2021-09-22 (T+187.7d) Image below (2021-09-22.135) was taken 187.7 days after discovery of Nova Nova is shown by white cross hairs.  Measured magnitude +7.74 Note: star object is saturated and shows some blooming, mag is probably underestimated (linked with Detection Threshold = 50)

Annotated CCD Image (100% size, linear scale, cropped) 5 x 30s exposure (average combine), 3x3 binning, C Filter 2021-09-22 03:15 UT (#915291-95) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Nova Cas 2021 (V1405 Cas) Spectra - 2021-09-22 (T+187.7d)

Spectra produced in AstroMain using Image taken with Star Analyser 200 5 x 30s exposure (average combine), 2x2 binning, S Filter 2021-09-22 03:18 UT (#915296-300) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of Nova Cas 2021 on Novae Page >>

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