David's Astronomy Pages CCD Images - Session 721 (2019-11-13)

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Images (S722)

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Session Notes

LAMOST-HVS1 - Hyperveolocity (HV) Star     Variable Stars (photometric monitoring)   - RX And, SS Cyg, U Gem, BL Lac - U And, FO Ori, NV Ori, GK Per, ER UMa attempts failed due to cloud     Nearby Stars (astrometric monitoring)  - DX Cnc, Teegardens Star - HH And, Groombridge 34 attempts failed due to cloud

- Post-Midnight Session (6.0 hours) Session operated under automated control Session preceeded by PHD2 testing/tuning - Main aim of the session was to test a number of new program features and to acquire images of a selection of targets     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature:  Starting at -1°C (min) before rising to +1°C by dawn (Dew heaters on new automated control) - CCD Temperature:  -20/-25°C  (61%/68% av. power) - Notes from 2019-11-13 >>

LAMOST-HVS1 - Hyperveolocity (HV) Star

LAMOST-HVS1 is the first hypervelocity star (HVS) discovered from the LAMOST spectroscopic survey (Zheng et al, 2014, see report ) .  It is a B-type star with a heliocentric radial velocity about 620 km/s, which projects to a Galactocentric radial velocity component of ~477 km/s. With a heliocentric distance of ~13 kpc and an apparent magnitude of ~13 mag, it is the nearest bright HVS currently known. With a mass of ~9Msun, it is one of the three most massive HVSs discovered so far. The star is clustered  (taken from report abstract )

LAMOST-HVS1 (Cancer)

Annotated CCD Image (70% size) 7 x 20s exposure (average combine), 3x3 binning, C Filter 2019-11-14 05:14 UT (#721156-62) 12" LX200R (at f/10.4) + ST-10XME

LAMOST-HVS1 - Earlier Image (2019-10-25)

Annotated CCD Image (70% size) 4 x 20s exposure (average combine), 3x3 binning, C Filter 2019-10-25 05:19 UT (#714403-09) 12" LX200R (at f/10.4) + ST-10XME

LAMOST-HVS1 - Earlier Image (2019-01-03)

Annotated CCD Image (70% size) 6 x 20s exposure (average combine), 3x3 binning, C Filter 2019-01-03 03:42 UT (#647407-13) 12" LX200R (at f/10.4) + ST-10XME

LAMOST-HVS1 - Earlier Image (2018-12-04) Position of HVS1 star confirmed using Simbad & Aladin 10 Desktop  https://aladin.u-strasbg.fr/AladinDesktop/ (Catalogue Magnitude +12.98 (B) )

Annotated CCD Image (50% size) 3 x 20s exposure (average combine), 3x3 binning, C Filter  2018-12-04 00:03 UT (#639025-31) 12" LX200R  (at f/10.4) + ST-10XME

LAMOST-HVS1 - Earlier Detail (2018-12-04)

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

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