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Name
  MGAB-V249  
AAVSO UID
000-BNC-686 (190 observations)  
Constellation
Cygnus Sequence
J2000.0
21 30 56.71 +44 20 46.4  (322.73629 +44.34622) Search nearby
B1950.0 21 29 02.59 +44 07 31.3
Galactic coord. 89.496 -5.125
Other names

(Internal only)
2MASS J21305671+4420466 ATO J322.7362+44.3462 CMC15 J213056.7+442046
GALEX J213056.8+442047 GSC2.3 N31I073829 IPHAS J213056.72+442046.5
UCAC2 46973264 UCAC4 672-097665 USNO-A2.0 1275-15880340
USNO-B1.0 1343-0451411 ZTFJ213056.71+442046.5  
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Variability type
E/WD
Spectral type He-sdOB+WD
Mag. range
15.28 - 15.70 g
Discoverer Gabriel Murawski; T. Kupfer et al.
Epoch
28 Feb 2014 (HJD 2456716.9169) Ephemeris
Outburst --
Period 0.027319513001 d  (39.340098721 min)
Rise/eclipse dur. --
Remarks
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1 Schmeer, Patrick Gaia DR2 parallax 0.8329 0.0305 mas (distance 1162 43 pc).
2 Murawski, Gabriel Amplitude similar in all grizy bands. BP-G= -0.09. Min II = 15.49 g.
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References
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1 Kupfer T.; et al., 2020, The first ultracompact Roche lobe-filling hot
subdwarf binary
2020arXiv200201485K
2 Masci, F. J.; et al., 2019, The Zwicky Transient Facility: Data Processing,
Products, and Archive
2019PASP..131a8003M
3 G. Ramsay; M. Kennedy; P. Hakala; et al., 2019, ATel #13048 2019ATel13048....1R
4 Chambers, K. C.; et al., 2016,The Pan-STARRS1 Surveys 2016arXiv161205560C
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Images
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Supporting Documents
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4 Phase plot Murawski, Gabriel 2019-08-29 23:10 UTC Combined phase curve with ZTF and Pan-STARRS1 data.
3 Phase plot Nowak, Adam 2019-07-01 03:29 UTC Phase plot including ZTF and NADA data. NADA CV filter (CV-g= -0.21) and ZTF r filter (r-g= -0.21) data shifted to g magnitude.
2 JD plot Murawski, Gabriel 2019-05-25 17:05 UTC Light curve with ZTF data.
1 Phase plot Murawski, Gabriel 2019-05-25 16:58 UTC Combined phase curve with ZTF and Pan-STARRS1 data.
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Revision History
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5 Murawski, Gabriel 2020-02-06 10:00 UTC Type, spectral type and discoverer from 2020arXiv200201485K.
4 Schmeer, Patrick 2020-02-04 19:11 UTC Several designations added.
3 Murawski, Gabriel 2019-08-29 23:06 UTC Type and spectral type from 2019ATel13048....1R. Period and epoch from ZTF and Pan-STARRS1 data.
2 Nowak, Adam 2019-07-01 03:29 UTC Period and epoch from ZTF and NADA data.
1 Murawski, Gabriel 2019-05-27 19:56 UTC Gaia DR2 position.