David's Astronomy Pages Images - Session 669 (2019-02-26)

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C/2018 Y1 (Iwamoto) - Comet     HAT-P-12 - Exoplanet Host Star HAT-P-12 b - Exoplanet Transit     NGC 2185 - Reflection Nebula (H IV-20) NGC 2215 - Open Cluster (H VII-20) NGC 2232 - Open Cluster (H VIII-25) NGC 2286 - Open Cluster (H VIII-31) NGC 2311 - Open Cluster (H VIII-60) NGC 2343 - Open Cluster (H VIII-33) NGC 2353 - Open Cluster (H VIII-34) NGC 2438 - Planetary Nebula (H IV-39) NGC 2440 - Planetary Nebula (H IV-64) NGC 2479 - Open Cluster (H VII-58) NGC 2509 - Open Cluster (H VIII-1) NGC 2539 - Open Cluster (H VII-11) NGC 3432 - Spiral Galaxy with LBV 2000ch     Photometric Monitoring - Variables   - SY Cnc, CI Cyg, SS Her, CY Lyr, CN Ori, FO Ori, SU Tau (R CrB, S Cyg, SS Cyg, AM Her, U Her, U Mon, V Sge attempted (failed due to cloud, guide errors or dew)     Astrometric Monitoring - Nearby Stars  - DX Cnc, 61 Cyg, CN Leo - Barnards Star attempt (failed due to cloud)

- Full Night Session,  Duration 11.0hr Session operated in  fully automated mode, attended for parts of the first half / unattended for second half. Sky conditions good for first 9 hours , but deteriorating rapidly during final 2 hours of the session - Main aim of the session was general observing with mix of variable stars , nearby stars , comets and deep sky targets, plus an attempted observation of transit of exoplanet HAT-P-12 b     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:  9°C (max) dropping to 1° C (min) - CCD Temperature:  -20°C & -25C / 68 & 78% av. power) - Notes from 2019-02-26 >>

Observing Result (2019-02-26, S669)

C/2018 Y1 (Iwamoto) - Comet

C/2018 Y1 (Iwamoto)  (passing through Auriga) Sun Distance 1.32 AU Earth Distance 0.62 AU (92.8 million km)		C/2018 Y1 (Iwamoto) - Detail Aligned on Comet (Stars appears trailed due to movement of comet)
CCD Image (50% size) 14 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 21:47 UT (#669165-79) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2		CCD Image (100% size, cropped) Image details as left
More Images of C/2018 Y1 (Iwamoto)

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HAT-P-12 - Exoplanet Host Star

HAT-P-12 (Canes Venatici) with faint galaxies in same star field  PGC 2223954 (catalog mag +17.8) PGC 2222734 (catalog mag +18.4)

Annotated CCD Image (70% size) 25 x 30s exposure (average combine), 3x3 binning, BB / Xo Filter 2019-02-26 23:48 UT (#669271-95) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

HAT-P-12 - Earlier Image (2019-02-13) Alias GSC 3033:706

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

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HAT-P-12 b - Exoplanet / Exoplanet Transit

HAT-P-12 b exoplanet (Canes Venatici)

HAT-P-12 b, discovered by Hartman et al, 2009   http://adsabs.harvard.edu/abs/2009ApJ...706..785H is an exoplanet that orbits the star HAT-P-12 approximately every 3.21 days The image below was taken whilst HAT-P-12 was undergoing a transit by the exoplanet and is part of a series of images that taken together show a small but diagnostic reduction in the brightness of the host star during the transit. Mass 0.211 MJupiter,  radius of 0.959 RJupiter , mean density of 0.295 g cm-3. Period = 3.2130598 ± 0.0000021 d, transit epoch Tc = 2454419.19556 ± 0.00020 (BJD) HAT-P-12 lies at a distance 464 light years (142.5 parsecs), is K4 Dwarf with mass 0.73 Msun

Annotated CCD Image (70% size) 10 x 30s exposure (average combine), 3x3 binning, Xo Filter 2019-02-27 01:03 UT (#669402-11) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Summary Light Curve showing transit of HAT-P-12b 2019-02-27 00:03 to 02:23 UT Data collected (420 x 30s frames) demonstrate a clear dip in the brightness of host star HAT-P-12 that corresponds with the forecast time and depth of the transit by exoplanet HAT-P-12 b. (timings from Transit Finder Tool on  https://astro.swarthmore.edu  )

Detailed Light Curve showing transit of HAT-P-12b 2019-02-27 00:03 to 02:23 UT with various environmental & supporting information

420 x 30s frames collected between 2019-02-26 23:40 & 2019-02-27 03:53 UT (JD  2458541.49 - 2458541.66) Images taken through an Astrodon Exoplanet Blue Blocking (BB) Filter, and reduced using the appropriate Master Dark  and Master Flat Frames [ Master.-20c_3x3_030s.S660.AvMedian17.ST10.DARK.FIT & MasterFlat.3x3.Xo.S629.SkyFlats.AvMedian15.FIT] Photometry using 3 calibration stars (C1 to C3) based on AAVSO's Photometry Sequence for HAT-P-12 (see details below) Differential Magnitudes for HAT-P-20 are zero based using average calculated magnitude from the interval (02:30-03:53) that followed the transit Differential Magnitudes for Check Star are  zero based using average calculated magnitude  from the entire run and are shifted by +0.10mag for display 5 min moving average of Differential Mags are displayed for both HAT-P-12 and theCheck Star. No (V+R) magnitude data was available for the BB (Blue -Blocking) filters used and therefore V Magnitude where used instead for the calibration. (This is likely to make the calculated magnitude slightly off the HAT-P-12's true V mag,  but differential magnitudes should still be good) SNR, Ambient Temperature and Altitide data is shown in the graph for information. (note that altitude varied from 51 to 76 over the course of the observing run) Raw Magnitudes & SNR measured using AstroMain/VMA and CCDSoft.  Calibrated Magnitudes and Differential Magnitudes calculated usin MS Excel (also used for graphing the results)

Image of HAT-P-12 Showing Calibration Stars (C1-C3) and Check Star (K) used for photometric analysis of HAT-P-12  HAT-P-12 (GSC 3033:706) :  V Mag +12.84,  AUID 00-BKN-997 C1 (GSC 3033:996): V Mag +13.130 (0.025) , AUID 000-BLT-550 C2 (GSC 3033:872): V Mag +13.314 (0.031), AUID 000-BLT-551 C3 (GSC 3033:978): V Mag +12.924 (0.039), AUID 000-BLT-549 K (GSC 3033:754): V Mag +13.939 (0.035),  AUID 000-BLT-542 (C1-C3 and their magnitudes are chosen from the AAVSO's Field Photometry for HAT-P-12 (Sequence Magnitudes Source  is APASS

Annotated CCD Image (70% size) Taken through Astrodon Exoplanet Blue Blocking (BB) Filter 25 x 30s exposure (average combine), 3x3 binning, BB / Xo Filter 2019-02-26 23:48 UT (#669271-95) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2185 - Reflection Nebula (H IV-20)

NGC 2185 / H IV-20 (Monoceros)

CCD Image (50% size) 4 x 90s exposure (average combine), 3x3 binning, C Filter 2019-02-26 19:50 UT (#669050-53) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 2185 - Detail

CCD Image (100% size, linear scale, cropped) Image details as above

Negative CCD Image (100% size, linear scale, cropped) Image details as above

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NGC 2215 - Open Cluster (H VII-20)

NGC 2215 / H VII-20 (Monoceros)

CCD Image (70% size) 4 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 19:03 UT (#669003-08) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2232 - Open Cluster (H VIII-25)

NGC 2232 \ H VIII-25 (Monoceros) Bright star at top of image is 10 Monocerotis (HIP 30772), Mag +5.05

CCD Image (70% size) 5 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 19:11 UT (#669012-18) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2286 - Open Cluster (H VIII-31)

NGC 2286 /  H VIII-31 (Monoceros)

CCD Image (70% size) 3 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 20:49 UT (#669108-10) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2311 - Open Cluster (H VIII-60)

NGC 2311 / H VIII-60 (Monoceros)

CCD Image (70% size) 5 x 45s exposure (average combine), 3x3 binning, C Filter 2019-02-26 19:22 UT (#669021-26) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2343 - Open Cluster (H VIII-33)

NGC 2343 / H VIII-33 (Monoceros)

CCD Image (70% size) 4 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 20:00 UT (#669056-61) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2353 - Open Cluster (H VIII-34)

NGC 2353 / H VIII-34 (Monoceros) Hidden Treasures H40 [ Herschel 400 Objects ] [ Open Star Clusters ] [ Hidden Treasures ] Bright star is HIP 34999 (mag +6.0)

CCD Image (70% size) 13 x 15s exposure (average combine), 3x3 binning, C Filter 2019-02-26 22:22 UT (#669201-15) 12" LX200R (at f/10.4) + ST-10XME

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NGC 2438 - Planetary Nebula (H IV-39)

NGC 2438 / H IV-39 (Puppis)

CCD Image (50% size) 5 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 20:22 UT (#669076-82) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 2438 - Detail

CCD Image (100% size, cropped) Image details as above

NGC 2438 - Spectra (taken with Star Analyser 100)

CCD Image (100% size, rotated, cropped) 4 x 45s exposure (average combine), 3x3 binning, S Filter 2019-02-26 20:26 UT (#669083-87) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 2438 - Earlier Image (2007)

CCD Image (200% size, Linear Scale, cropped) 2 x 60s exposure (average combine), 2x2 binning, C Filter 2007-12-06 21:29 hUT (#239203-05) 8" LX200 Classic + ST-7E

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NGC 2440 - Planetary Nebula (H IV-64)

NGC 2440 / H IV-64 (Puppis) Hidden Treasures 41   [ Herschel 400 Objects ] [ Hidden Treasures ]

CCD Image (50% size, Linear Scale) 5 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 20:22 UT (#669076-82) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

CCD Image (50% size, logscale) Image details as above

NGC 2440 - Detail ( Ast. Now Deep Sky Challenge Object, Feb 2013 )

CCD Image (100% size, logscale, cropped) Image details as above

NGC 2440 - Spectra (taken with Star Analyser 100)

CCD Image (100% size, rotated, cropped) 6 x 30s exposure (average combine), 3x3 binning, S Filter 2019-02-26 20:41 UT (#669098-104) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2422 - Open Cluster (M47, H VIII-38)

NGC 2422 / H VIII-38, M47 (Puppis) Central Portion

CCD Image (70% size) 9 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 21:10 UT (#669127-37) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 2422 / H VIII-38, M47 - Earlier Image (2007)

CCD Image Mosaic (60% size) 30s exposure, 2x2 binning, C Filter, Linear Scale 2007-12-06 02:32 hUT (#239218-29) 8" LX200 classic + ST-7e [ Full Size ]

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NGC 2479 - Open Cluster (H VII-58)

NGC 2479 / H VII-58 (Puppis)

CCD Image (70% size) 5 x 45s exposure (average combine), 3x3 binning, C Filter 2019-02-26 22:30 UT (#669218-24) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2509 - Open Cluster (H VIII-1)

NGC 2509 / H VIII-1 (Puppis)

CCD Image (70% size) 6 x 45s exposure (average combine), 3x3 binning, C Filter 2019-02-26 22:39 UT (#669227-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 2539 - Open Cluster (H VII-11)

NGC 2539  H VII-11 (Puppis) Hidden Treasures 45   [ Herschel 400 Objects ] [ Hidden Treasures ]

CCD Image (70% size) 3 x 30s exposure (average combine), 3x3 binning, C Filter 2019-02-26 20:12 UT (#669066-72) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

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NGC 3432 - Spiral Galaxy with LBV 2000ch

NGC 3432 (Leo Minor)

CCD Image (50% size) 2 x 180s exposure (average combine), 3x3 binning, C Filter 2019-02-26 21:24 UT (#669142-43) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

NGC 3432 - Detail

CCD Image (100% size, cropped) Image details as above

LBV 2000ch in NGC 3432 LBV 2000ch is a Luminous Blue Variable (LBV) in the galaxy NGC 3432, about 30 million light-years from Earth. 2000ch was discovered 2000-05-03.20 (May 2000), when it was found by the LOSS survey at magnitude +17.4.  ( Rochester Supernova site |  2000ch subpage | Original LOSS Discovery Image (2000) |  K. Itagaki image (2019) ) Initially thought to be a nova in our own galaxy, it was reclassified as a subluminous type IIn supernova when its true distance was determined. Unexpectedly, it reappeared in 2013, showing that 2000ch is not a supernova but most probably an Eta Carinae type star that is undergoing a series of outbursts.  Further outbursts occured in April 2014, January 2017 and February 2018. It was found again in outburst on 2019-02-24.50 by K. Itagaki  at magnitude +17.9. LBV 2000ch is show in images below (2019-02-26.89 ) by the black cross-hairs Image taken 2.4 days after outburst discovery

Negative CCD Image(100% size, cropped) Image details as above

Images of LBV 2000ch (NGC 3432) on LBV Transients Page >>

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