David's Astronomy Pages CCD Images - Session 664 (2019-02-17)

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Images (S665)

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Session Notes

TZ Cas - Variable Star (Type EA variable, eclipsing binary) RR Leo - Variable Star (Type RR Lyr) CoRoT-1 - Exoplanet Host Star WASP-12 - Exoplanet Host Star             Photometric Monitoring - Variables   - RX And, Z And, SS Cygfg, RR Leo, U Mon, CN Ori, FU Ori, NV Ori, GK Per, RR Tau, SU Tau, ER UMa     Astrometric Monitoring - Nearby Stars  - HH And, Teegardens Star CN Leo attempt failed (cloud)

- Evening Session,  Duration 4.0hr Session operated in fully automated mode, but monitored in part over a remote connection.  Sky conditions  moderate (bright sky due to moon)  Session aborted due to effect of increasing wind strength on imaging/focusing - Main aim of the session was to continue taking reconnaisance images of a number of exoplanet host stars and general variable/nearby star monitoring     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:  6.6°C (minimum)  - CCD Temperature:  -20° / 78% av. power) - Notes from 2019-02-17 >>

TZ Cas - Variable Star (Type EA variable, eclipsing binary)

GCVS TV Cas (Cassiopeia) Alias HIP 1550 Period 1.8125913d, mag 7.22 to 8.22 (Image uses the corrected N offset that now allow the planned reference star  ( HIP 1428, mag + 7.71, at bottom right)  to lie inside the field of view)

Annotated CCD Image (50% size) 4 x 3s exposure (average combine), 3x3 binning, C Filter 2019-02-17 19:17 UT (#664036-39) 12" LX200R (at f/10.4) + ST-10XME

GCVS TV Cas through V Filter TV Cas: mag 7.22 to 8.22, V Mag +7.27,  B-V 0.06 C1 (HIP 1428),  V Mag +7.72, B- V -0.05 K1 (GSC 3665:26), Mag +9.05 K2  (GSC 3665:628), Mag 11.19

Annotated CCD Image (70% size) 5 x 4s exposure (average combine), 3x3 binning, V Filter 2019-02-17 19:18 UT (#664040-44) 12" LX200R (at f/10.4) + ST-10XME

- 4s exposure in V band (3x3 binning), C1 max pixel  55200,  TV Cas max pixel 54900, 25 link stars (UCAC2/USNO ) -  3s exposure in R band (3x3 binning), C1 max pixel  51900,  TV Cas max pixel 57500, 24 link stars (UCAC2/USNO)

GCVS TV Cas - Earlier Image (2019-02-13) (Image used an  incorrect N offset that prevented the planned reference star  ( HIP 1428, mag + 7.71)  from lying inside the field of view)

Annotated CCD Image (50% size) 5 x 3s exposure (average combine), 3x3 binning, C Filter 2019-02-13 19:28 UT (#663012-16) 12" LX200R (at f/10.4) + ST-10XME

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RR Leo - Variable Star (Type RR Lyr)

GCVS RR Leo (Leo) Period 0.4523933d, mag 9.94 to 11.27 Alias  HIP 49628, GSC 1968:756

Annotated CCD Image (50% size) 4 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-17 21:13 UT (#664176-80) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

GCVS RR Leo through V Filter RR Leo: mag 9.94 to 11.27, V Mag +10.76,  B-V 0.48 C (GSC 1968:860),  V Mag +10.03, B- V 0.80 K (GSC 1968:912), Mag +11.0 (Image offset should be increased by 2' W, 1' E to reliably secure the comparison star

Annotated CCD Image (50% size) 5 x 20s exposure (average combine), 3x3 binning, V Filter 2019-02-17 21:16 UT (#664181-85) 12" LX200R (at f/10.4) + ST-10XME

20s, V filter 3x3,  max pixel 26100 (C Star) 30s, B Filter, 3x3, max pixel 14000 (C star) It is proposed to increase exposure times to 30s V, 45s B

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CoRoT-1 - Exoplanet Host Star

CoRoT-1  (Monoceros) CoRoT-1: V mag 13.6,  alias GSC 4804:2268 CoRoT-1b:  Depth 21mmag, period ~1.51d

CoRoT-1 through Astrodon Exoplanet Blue Blocking (BB) Filter Image taken with revised centering offsets to more reliably secure all 7 reference stars) Exposure had been changed to 60s following earlier attempt at 30s, however 60s image produces max pixel value of 62700  for C1 & 61000 for C5 Whilst dropping to 45s is an option, the 60s image produces a max pixel of only 13700 for CoRoT-1, therefore dropping C1 and C5 , and adding C8 (GSC 4804:2216, mag 11.6) might be an alternative option

Annotated CCD Image (70% size) 60s exposure (single frame), 3x3 binning, Xo Filter 2019-02-17 22:10 UT (#664246) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

CoRoT-1 through Astrodon Exoplanet Blue Blocking (BB) Filter - Earlier Image (2019-02-13) Photometric options for measuring a future transit of CoRoT-1 b are : a) use a single reference star C1 (GSC 4804:1326 (C1, V mag +10.55, B-V 0.87) with one check star GSC 4804:1592 (mag +13.4)  or b) use an essemble of reference stars C1 to C7 C1 (as above), C2 (GSC 4804:1354, mag +11.8), C3 (GSC 4804:2194, mag +11.4), C4 (HIP 32600,mag +10.92), C5 (GSC 4804:1766, mag +11.8), C6 (GSC 4804:1756,  mag+12.8), C7 (GSC 4804:1170, mag 12.6) CoRoT-1: (catalog V mag 13.6, B-V 0.16) (Image offset should be increased by 1.4' W, 0.5' S to reliably secure all 7 reference stars)

Annotated CCD Image (70% size) 2 x 30s exposure (average combine), 3x3 binning, Xo Filter 2019-02-13 21:31 UT (#663162-63) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

30s exposure in Xo (BB) filter, 3x3 binning, max pixel 22950 (C1 Star),  3300 (CoRoT-1)

CoRoT-1 - Earlier Image (2019-02-13)

Annotated CCD Image (50% size) 2 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-13 21:29 UT (#663159-60) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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WASP-12 - Exoplanet Host Star

WASP-12  (Auriga) WASP 12 (GSC 1891:1178):  V mag 11.7, B-V 0.42, WASP-12 b: Depth 15 mmag, period 1.09d Astrodon Exoplanet Blue Blocking (BB) Filter Conditions too windy for any good images but it demonstrates use of revised centering offset and reveals a potential 6th Reference Star in the FOV hat could also be used for relative photometry (C6,  GSC 1891:188, mag +10.3)

Annotated CCD Image (50% size) 5 x 30s exposure (average combine), 3x3 binning, Xo Filter 2019-02-17 22:41 UT (#664275-79) 12" LX200R (at f/10.4) + ST-10XME

WASP-12 through Astrodon Exoplanet Blue Blocking (BB) Filter - Earlier Image (2019-02-13) Photometric options for measuring a future transit of WASP-12 b are : a) use a single reference star C1 (HD 258379, V mag +9.51, B-V 0.51) with one check star K (GSC 1891:731, mag +12.1)  or b) use an essemble of reference stars C1 to C5 C1 (as above), C2 (GSC 1891:326, mag +10.3), C3 (GSC 1891:741, mag +10.3), C4 (GSC 1891:324, mag +11.3), C5 (GSC 1891:38, mag +12.1) WASP-12:  (catalog V mag 11.7, B-V 0.42, (Image offset should be increased by 1.3' E, 1.6' S to reliably secure all 5 reference stars)

Annotated CCD Image (70% size) 2 x 30s exposure (average combine), 3x3 binning, Xo Filter 2019-02-13 21:54 UT (#663190-91) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Frames have been examined  to check whether the exposure time used (30s) is ok or not. 30s exposure in Xo (BB) filter, 3x3 binning, max pixel 59000 (C1 Star),  42668 (C2 Star),  16280 (WASP-12) Proposal is to change keep exposure time at 30s (3x3 binning) , but drop the C1 star as being too bright

WASP-12  - Earlier Image (2019-02-13)

Annotated CCD Image (50% size) 2 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-13 21:51 UT (#663184-86) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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