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Details for Revision 5
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Name
  FG Sge  
AAVSO UID
000-BCK-875 (15954 observations)  
Constellation
Sagitta Sequence
J2000.0
20 11 56.06 +20 20 04.2  (302.98358 +20.33450) Search nearby
B1950.0 20 09 43.09 +20 11 02.6
Galactic coord. 60.332 -7.393
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
2MASS J20115606+2020044 AAVSO 2007+20 ALS 10924
AN 377.1943 ASAS J201156+2020.0 GSC 01626-00619
HIP 99527 Hen 2-457 Hen 3-1844
SON 3702 TYC 1626-619-1  
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Variability type
FF
Spectral type B4Ieq-K2Ib
Mag. range
8.7 - 23.0 V
Discoverer --
Epoch
--
Outburst --
Period --
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto VSP Note: 12.3 Vmag. companion 8" to the East and 17.2 Vmag. companion 4" to the NE (see VSX image)
2 GCVS Team VB A (B 14.2m, 8", 100deg). The central star of the planetry nebula PK 60deg (diameter 36", the age about 6000 years). The brightness of the star steadily increased from 13.6 pg in 1894 to the maximum in 1967, and then is steadily decreasing. In 1982 it was 11.0 B. In 1967 the strong absorption lines of rare earth elements appeared in the spectrum. The spectral class steadily becomes later. The signes of new planetary nebula ejection were observed. In 1962 the star entered the instability strip in the Mv, B-V diagram and began to pulsate with a small amplitude and increasing period: Min(V) = 2442629 + 59.83d*E + 1.126d*E**2 (JD2442600 - 44530). In twenty years the period increased from 50d to 134d, the amplitude of pulsations changed from 0.2mV to 0.5mV; now it decreased again to 0.2mV, and the period is only 90d [V.P.Arkhipova, G.V.Zajtseva, R.I.Noskova, Yu.V.Voroshilov, M.V.Savel'eva, Astron. Tsirk. N1250, 1, 1983.].
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References
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1 ZTF Catalog of Periodic Variable Stars (online data) 2020arXiv200508662C
2 Chen, X.; et al., 2020, The Zwicky Transient Facility Catalog of Periodic
Variable Stars		 2020arXiv200508662C
3 Rosenbush, A. E.; Efimov, Y. S., 2015, Photometry, Spectrometry, and
Polarimetry of FG Sge in the Active State		 2015Ap.....58...46R
4 Clayton, G. C.; et al., 2006, V605 Aquilae: The Older Twin of Sakurai's
Object		 2006ApJ...646L..69C
5 C. Koen, L. Eyer, 2002, MNRAS 331, 45 2002MNRAS.331...45K
6 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
7 V.P.Arkhipova, Perem. Zvezdy 21, N5, 617, 1982. 1982PZ.....21..617A
8 G.H.Herbig, A.A.Boyarchuk, ApJ 153, 397, 1968. 1968ApJ...153..397H
External Links
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Supporting Documents
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1 Finding chart Otero, Sebastian Alberto 2015-08-12 05:06 UTC Image by Msgr. Ron Royer from the November 1998 Variable Star of the Month article.
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Campaigns/Programs
 LPV Double Trouble Campaign
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
6 Otero, Sebastian Alberto 2021-10-26 01:32 UTC ZTF name from 2020arXiv200508662C added. Gaia EDR3 position.
5 Otero, Sebastian Alberto 2015-08-12 05:06 UTC UCAC4 position. Finding chart and VSP note added.
4 Otero, Sebastian Alberto 2015-08-08 01:09 UTC Type from 2006ApJ...646L..69C. Minimum magnitude from 2015Ap.....58...46R.
3 Otero, Sebastian Alberto 2012-02-04 09:34 UTC Range from AAVSO data.
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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