David's Astronomy Pages Images - Session 663 (2019-02-13)

Images (S662)

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Images (S664)

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Session Notes

TZ Cas - Variable Star (Type EA variable, eclipsing binary)     CoRoT-1 - Exoplanet Host Star HAT-P-12 - Exoplanet Host Star HAT-P-20 - Exoplanet Host Star HAT-P-36 - Exoplanet Host Star WASP-12 - Exoplanet Host Star XO-2 - Exoplanet Host Star     Photometric Monitoring - Variables   - U And, Z And, AM CVn, SY Snc, U Gem,  RZ LMi, CN Ori, FO Ori, FU Ori, NV Ori, GK Per, RR Taus, SU Tau U Mon attempted failure (cloud)     Astrometric Monitoring - Nearby Stars  - HH And, Teegardens Star CN Leo attempt failed (cloud)

- Evening Session,  Duration 7.1hr Session operated in fully automated mode, but monitored in part over a remote connection.  Sky conditions  poor (poor transparency ).  Session aborted when cloud became too bad. - Main aim of the session was to continue taking reconnaisance images of a number of exoplanet host stars and new variable stars     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:  7°C (minimum)  - CCD Temperature:  -20° / 81% av. power) - Notes from 2019-02-13 >>

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 (An incorrect N offset was unfortunately used causing the planned reference star  ( HIP 1428, mag + 7.71)  to lie outside of 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

TZ Cas in a reasonable bright star and could be danger of saturating the CCD if exposure times are too long Images taken through V and R band filters are not shown here since reference star is not available. However frames have been examined  to check whether the exposure times used are ok or not. - 5s exposure in V band (3x3 binning), max pixel  59260, 11 link stars (UCAC2/USNO ) - 4s exposure in R band (3x3 binning), max pixel 58950, 25 link stars (UCAC2/USNO) Conclusion is to change reduce exposure time to  3s R,  4s V (3x3 binning)

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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

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

CoRoT-1 through Astrodon Exoplanet Blue Blocking (BB) Filter 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

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 22950 (C1 Star),  3300 (CoRoT-1) Proposal is to change exposures time to using 60s (3x3 binning)

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HAT-P-12 - Exoplanet Host Star

HAT-P-12 (Canes Venatici) Alias GSC 3033:706,  V mag 12.8, B-V -0.24, HAT-P-12b :  Depth 21 mmag, Period 3.21d

Annotated CCD Image (50% size) 3 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-13 23:06 UT (#663253-55) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

HAT-P-12 through Astrodon Exoplanet Blue Blocking (BB) Filter  Cloud unfortunately prevented acquisition of planned images through BB (Xo) filter

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HAT-P-20 - Exoplanet Host Star

HAT-P-20  (Gemini) V mag 11.3, B-V --, HAT-P-20b Depth 18 mmag, Period ~2.87d (Alias UCAC3 229-88755, but seems also to correspond with position of GSC 1910:239)

Annotated CCD Image (50% size) 3 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-13 19:36 UT (#663030-32) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

HAT-P-20 through Astrodon Exoplanet Blue Blocking (BB) Filter Note.  I use the abbreviation Xo for the filter instead of BB Whilst surrounding star images look circular the HAT-P-20 star appears elongated indicating that there must be two adjacent stars which are unresoved in this particular image.

Annotated CCD Image (100% size, cropped) 20s exposure (single frame), 3x3 binning, Xo Filter 2019-02-13 19:38 UT (#663035) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

HAT-P-20 - Detail (1) The enlarged image which uses a wider black-white range reveals two stars with a 6 arc sec separation A brighter star (mag +10.9) and a fainter one (mag +12.8) can be seen . It is believed that the HAT-P-20 is the brighter star of the two Photometery will probably measure the combined brightness of both stars, however provided the dimmer star isn't variable this shouldn't preclude been able to make an attempt to detect a future transit of exoplanet HAT-P-20 b (uncertainty levels may however be too high in conditions anything other than perfect seeing )

CCD Image (200% size, cropped) Image details as above

HAT-P-20 - Detail (2) An alternate image produced from 4 stacked frames and with suitably adjusted black white range reveals 3 other dim stars (mag +17 or so) lying at between 14 and 21 arc sec separation from HAT-P-20. These shouldn't interfere with photometric measurement of HAT-P-20

CCD Image (200% size, cropped) 4 x 20s exposure (average combine), 3x3 binning, Xo Filter 2019-02-13 19:38 UT (#663034-37) 12" LX200R (at f/10.4) + ST-10XME

HAT-P-20 - Photometry Options HAT-P-20 is mag +11.3 with unknown B-V value. Options for photometric measurements of a future exoplanet transit are a) use the single reference star C1 (GSC 1914:551, V mag +10.59, B-V 0.93) (note C1 has a dim star very closeby which might effect photometry) or b) use an ensemble of 5 reference stars - C1 to C5 C2 (GSC 1910:361, mag 11.2), C3 (GSC 1914:590, mag +11.4),  C4 (GSC 1910:871, mag 11.4),  C5 (GSC 1914:617, mag +11.6),

CCD Image (70% size) 4 x 20s exposure (average combine), 3x3 binning, Xo Filter 2019-02-13 19:38 UT (#663034-37) 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 (20s) is ok or not. 20s exposure in Xo (BB) filter, 3x3 binning, max pixel 21630 (C1 Star),  12080 (HAT-20-P) Conclusion is to increase exposure time to 30s (3x3 binning)  (IResult from following session 2019-02-17 S664: 30s exposure in Xo (BB) filter, 3x3 binning, max pixel 52850 (C1 Star),  34300 (HAT-20-P)

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HAT-P-36 - Exoplanet Host Star

HAT-P-36 (Canes Venatici) HAT-P-36 : V mag 12.3, B-V 0.82,    Alias GSC 3020:2221 HAT-P-36 b: Depth 15 mmag, period 1.33d

Annotated CCD Image (50% size) 5 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-13 22:54 UT (#663240-44) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

HAT-P-36 through Astrodon Exoplanet Blue Blocking (BB) Filter Photometric options for measuring a future transit of HAT-P-36 b are : a) use a single reference star C1 (GSC 3020:2075, V mag +10.71, B-V 0.86) with one check star K1 (GSC 3020:2195, V mag +11.50, B-V 0.25)  or b) pair of  reference stars C1 & C2 C1 (as above), C2 (GGSC 3020:2195, V mag +11.50, B-V 0.25) with one check star K2 (GSC 3020:2203, mag +12.8)    HAT-P-36:  (catalog V mag  mag 12.3, B-V 0.82)

Annotated CCD Image (70% size) 4 x 30s exposure (average combine), 3x3 binning, Xo Filter 2019-02-13 22:58 UT (#663245-49) 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 23245-31190 (C1 Star),  6440 (HAT-P-36) Proposal is to keep use either 30s or 45s depandent on sky conditions (3x3 binning)

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WASP-12 - Exoplanet Host Star

WASP-12  (Auriga) Alias UCAC2 42216354 /  GSC 1891:1178 WASP 12:  V mag 11.7, B-V 0.42, WASP-12 b: Depth 15 mmag, period 1.09d

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

WASP-12 through Astrodon Exoplanet Blue Blocking (BB) Filter 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

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XO-2 - Exoplanet Host Star

XO-2  (Lynx) V mag 11.2, B-V 0.82, XO-2 b Transit Depth 12 mmag, Period 2.61d Alias GSC 3413:5

Annotated CCD Image (50% size) 3 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-13 19:36 UT (#663030-32) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

XO-2 through Astrodon Exoplanet Blue Blocking (BB) Filter Photometry Options XO-2 is mag +11.2 in V Band, with B-V value. of 0.82 Most obvious photometric option is to use a single reference star HD 233451 (V mag +10.21, B-V 0.39) with one check star GSC 3413:210 (mag +11.1)  (these are the same stars used in earlier study in 2007-2009)

Annotated CCD Image (70% size) 4 x 20s exposure (average combine), 3x3 binning, Xo Filter 2019-02-13 19:38 UT (#663034-37) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

XO-2 - Earlier Image (2007)

Annotated CCD Image  30s, 2x2 binning, R Filter 2007-05-07 23:07 hUT (#196040) 8" LX200 Classic + ST-7E

XO-2, Attempted Transit Observations

XO-2b Transit (2009-11-08)

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