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

Objects Session Notes
Bullet 11P/Tempel-Swift-LINEAR - Comet
Bullet C/2020 Q1 (Borisov) - Comet (Attempt)
   
Bullet NGC 5157 - Spiral Galaxy with Type 1a SN 2020ees
   
Bullet UGC 6930 - Spiral Galaxy with Type Ia Supernova 2020rcq
   
Bullet Variable Stars (photometric monitoring)
- RX And, S Cyg

- U Her attempt failed (cloud)
   
Bullet 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 >>
    
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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
  Image
     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
Image   Image
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)
Image   Image
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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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
Image
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
Image
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
Image
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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