David's Astronomy Pages CCD Images - Session 815 (2020-09-29)

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Session Notes

NGC 5157 - Spiral Galaxy with Type 1a SN 2020ees UGC 6930 - Spiral Galaxy with Type Ia Supernova 2020rcq 11P/Tempel-Swift-LINEAR - Comet C/2020 Q1 (Borisov) - Comet (Attempted Sighting)     Variable Stars (photometric monitoring) - RX And, S Cyg - U Her attempt failed (cloud)     Nearby Stars (astrometric monitoring) - Barnards Star, 61 Cyg

- Whole night session (3.6 hours total, excluding time loss to CCD Image saving issue) - Main aims of the session were the acquisition of a selection of deep sky targets, together with some variable star, nearby star and comet targets (if conditions allowed) - Session affected by problems with stalling of dome data (twice) and an issue due to CCDSoft not saving images from 23:57 onwards - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: 10°C (min), but warming later - CCD Temperature:  -15°C (-10°C later) - Notes from 2020-09-29 >>      -

NGC 5157 - Spiral Galaxy with Type 1a Supernovae 2020ees

NGC 5157 with SN 2020ees (Canes Venatici) SN 2020ees (Type 1a), discovered 2020/03/05.472 by ATLAS  ( Rochester Supernova site | Odd Trondal image ) Image below (2020-09-29.817) was taken 208.3 days after discovery of SN 2020ees Image doesn't show any indication of an object at the location of the earlier SN, but image quality is poor due to adverse sky conditions

Annotated CCD Image (150% size, square root scale, cropped) 5 x 180s exposure (average combine), 3x3 binning, C Filter 2020-09-29 19:37 UT (#815005-09) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 5157 with SN 2020ees - Earlier Image (2020-05-14)  Image below (2020-05-14.024) was taken 69.6 days after discovery of SN 2020ees SN is shown by white cross hairs.   Measured SN magnitude +17.9

Annotated CCD Image (150% size, square root scale, cropped) 3 x 180s exposure (average combine), 3x3 binning, C Filter 2020-05-14 00:34 UT (#782026-30) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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UGC 6930 - Spiral Galaxy with Type Ia Supernova 2020rcq

UGC 6930 with SN 2020rcq (Ursa Major) SN 2020rcq (Type 1a, z=0.002597) discovered 2020/08/09.168 by Zwicky Transient Facility (ZTF)  (Rochester Supernova site | Giancarlo Cortini image | )

UGC 6930 with SN 2020rcq - Detail, 2020-09-29 pm (T+51.7d) Image below (2020-09-29.835) was taken 51.7 days after discovery of SN 2020rcq SN is shown by white cross hairs.  Measured SN magnitude +13.0

Annotated CCD Image (100% size, square root scale, cropped) 5 x 120s exposure (average combine), 3x3 binning, C Filter 2020-09-29 20:03 UT (#815029-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Images of SN 2020rcq (UGC 6930) on Supernovae 2020 Page >>

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11P/Tempel-Swift-LINEAR - Comet

Star field (Pegasus) through which 11P/Tempel-Swift-LINEAR passed in session S812 (2020-09-19 21:57)		Star field - 2020-09-29, Detail (10 days later) No indication that earlier image of 2020-09-19 showed a cometary object that had then moved out of the starfield  in the intervening 10 day interval
50% size image not shown here
		CCD Image (100% size, square root scale, cropped) 4 x 180s exposure (average combine), 3x3 binning, C Filter 2020-09-29 20:31 UT (#815037-40) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2
11P/Tempel-Swift-LINEAR (passing through Pegasus) Sun Distance 1.57 AU Earth Distance 0.63 AU (94.5 million km) (forecast mag in TheSky6 +10.0) No indication of a comet at expected position (circled) Star Field to be reshot in following session. Comet to be be reshoot at 10 x 180s in a fresh attempt to view it.		11P/Tempel-Swift-LINEAR - 2020-09-19, Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -6.59 arcsec/hr, Dec -0.97 arcsec/hr) Object close to comet's expected location might be the comet but at mag +18 or so it is much dimmer than the forecast mag
Annotated CCD Image (50% size, square root scale)  9 x 45s exposure (average combine), 3x3 binning, C Filter 2020-09-19 21:57 UT (#812091-99) 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
Observations at professional observatories confirm that the comet is indeed much fainter than the magnitude forecast in TheSky6, e.g. Pan-STARRS 2 telescope recorded comet at mag +20.3 to +20.6 on 2020-09-01 Observatorio de Cantabria recorded comet at mag +18.9 on 2020-08-31 http://www.minorplanetcenter.net/db_search/show_object?object_id=11P
Images of 11P/Tempel-Swift-LINEAR on Comets 2020 Page >>

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C/2020 Q1 (Borisov) - Comet, Attempted Sighting

C/2020 Q1 (Borisov)  (passing through Cepheus) Sun Distance 1.48 AU Earth Distance 0.75 AU (112.0 million km) (forecast mag in TheSky6 +15.1) No indication of a comet at the expected position (circled)		C/2020 Q1 (Borisov) - 2020-09-29, Detail Autoguided on offset star using PHD2 with Lock Shift set at the comet's rate of motion (Ra -649.20 arcsec/hr, Dec -258.48 arcsec/hr)
Annotated CCD Image (50% size, square root scale) 4 x 45s exposure (average combine), 3x3 binning, C Filter 2020-09-29 21:25 UT (#815072-75) 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 C/2020 Q1 (Borisov) on Comets 2020 Page >>

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