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Latest Details
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Name
  NSV 4509  
AAVSO UID
--  
Constellation
Leo Sequence
J2000.0
09 31 17.39 +27 23 14.1  (142.82246 +27.38725) Search nearby
B1950.0 09 28 22.59 +27 36 30.0
Proper motion
RA: -30.880 +/- 0.034 mas/yDec: -24.405 +/- 0.023 mas/ySource: Gaia DR1
Galactic coord. 200.555 +45.833
Other names

(Internal only)
ASCC 679969 BD+28 1768 HD 82191
HIP 46704 SAO 80877 SBC9 572
TIC 172529744 TYC 1962-498-1  
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Variability type
EA
Spectral type Am(A2/F2/A3)
Mag. range
6.62 - 6.72 V
Discoverer J. D. Fernie
Epoch
09 Feb 2020 (HJD 2458889.409) Ephemeris
Outburst --
Period 9.01197 d
Rise/eclipse dur. 2.8%  (6.1 h)
Remarks
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1 Nasonov, Dmitry Min II = 6.70 V.
2 GCVS Team SB2 (Am+Am).
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References
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1 Gaia collaboration; et al., 2022, Gaia Data Release 3 (Gaia DR3) Part 1
Main source
2022yCat.1355....0G
2 Huang, C. X.; et al., 2020, Photometry of 10 Million Stars from the First
Two Years of TESS Full Frame Images: Part I
2020RNAAS...4..204H
3 MASCARA Variable star catalogue (online data) 2018arXiv180602247B
4 O. Burggraaff, G.J.J. Talens, J. Spronck et al., 2018, Studying bright
variable stars with the Multi-site All-Sky CAmeRA (MASCARA)
2018arXiv180602247B
5 Perryman, M. A. C.; et al., 1997, The HIPPARCOS and TYCHO catalogues 1997HIP...C......0E
6 J.D.Fernie, IBVS N872, 1974. 1974IBVS..872....1F
External Links
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 6.43H = 6.44K = 6.43J - K = 0.01
AllWISE W1 = 6.43W2 = 6.35W3 = 6.48W4 = 6.54W1 - W2 = 0.08W3 - W4 = -0.07
SDSS-DR12 u = 8.01g = 6.83r = 6.81i = 6.97z = 8.08u - g = 1.17r - i = -0.16
Images
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Supporting Documents
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2 phase plot Nasonov, Dmitry 2025-05-05 18:51 UTC Light curve from MASCARA, Hipparcos, Gaia DR3 and TESS QLP photometry data folded with the best orbital period
1 zoomed phase plot Nasonov, Dmitry 2025-05-05 18:49 UTC Light curve from MASCARA, Hipparcos, Gaia DR3 and TESS QLP photometry data folded with the best orbital period, zoomed on minima
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Revision History
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4 Nasonov, Dmitry 2025-05-05 18:49 UTC Type, minimum magnitude, period, epoch and eclipse duration from MASCARA, Hipparcos, Gaia DR3 and TESS QLP data.
3 Admin, VSX 2018-08-29 00:26 UTC Update from [2018arXiv180602247B].
2 Admin, VSX 2010-01-18 23:18 UTC Update from NSV version of July 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.