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Details for Revision 5
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Name
  W Sgr  
AAVSO UID
000-BCW-976 (7145 observations)  
Constellation
Sagittarius Sequence
J2000.0
18 05 01.22 -29 34 48.3  (271.25508 -29.58008) Search nearby
B1950.0 18 01 49.57 -29 35 03.3
Galactic coord. 1.576 -3.980
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 1758-29 ADS 11029 A CD-29 14447
CPD-29 5230 HAT 622-9818 HD 164975
HIP 88567 HR 6742 IRC -30351
OGLE-BLG-CEP-26 SAO 186237  
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Variability type
DCEP
Spectral type F4-G2Ib
Mag. range
4.28 - 5.10 V
Discoverer Williamina Fleming (1906)
Epoch
01 Jan 1991 (HJD 2448257.806) Ephemeris
Outburst --
Period 7.594984 d
Rise/eclipse dur. 32%  (58.33 h)
Remarks
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1 Billiaert, Bruno Triple system. Spectroscopic binary (F5:V companion, 5 AU from the cepheid) and a 9.7 Vmag. A0V companion 0.16" away (2009AJ....137.3700E). Combined range given.
2 GCVS Team VB A (A 9.2m, 0.116", 153.3deg, 1976.477; B 13.5m, 33.4", 233deg; C 13.5m, 47.9", 101deg). P var. Max = 2403198.39 + 7.594695d*E (JD2403100 - 34500); since JD2434500 - see Table.
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References
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1 Breitfelder, J.; et al., 2016, Observational calibration of the projection
factor of Cepheids. II. Application to nine Cepheids with HST/FGS parallax
measurements		 2016arXiv160104727B
2 I. Soszynski et al., 2011, arXiv:1112.1406v1 (online I data) 2011arXiv1112.1406S
3 I. Soszynski et al., 2011, arXiv:1112.1406v1 (online V data) 2011arXiv1112.1406S
4 I. Soszynski et al., 2011, arXiv:1112.1406v1 (Chart) 2011arXiv1112.1406S
5 I. Soszynski et al., 2011, arXiv:1112.1406v1 [astro-ph.SR] 2011arXiv1112.1406S
6 D.M. Nataf, K.Z. Stanek, G.A. Bakos, 2010, arXiv:1009.2502v1 [astro-ph.GA] 2010arXiv1009.2502N
7 Evans, N. R.; Massa, D.; Proffitt, C., 2009, Massive Star Multiplicity: The
Cepheid W Sgr		 2009AJ....137.3700E
8 H.H.Swope, HA 109, N1, 1940. 1940AnHar.109....1S
9 Cannon, A. J., 1907, Second catalogue of variable stars 1907AnHar..55....1C
10 General Catalogue of Variable Stars, 4th Edition, Volumes I-III, P.N.
Kholopov et al.		 --
External Links
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Supporting Documents
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Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
6 Otero, Sebastian Alberto 2024-06-12 14:38 UTC Epoch and rise duration from AAVSO data.
5 Fernig, Leo 2022-04-22 13:35 UTC Discoverer updated from 1907AnHar..55....1C page 24
4 Fernig, Leo 2022-04-22 13:34 UTC Discoverer updated from 1907AnHar..55....1C page 22
3 Billiaert, Bruno 2016-02-03 23:09 UTC Period and epoch from 2016arXiv160104727B. Range from HIPPARCOS and GCPD 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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