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Latest Details
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Name
  EF Ser  
AAVSO UID
000-BFL-985 (No observations)  
Constellation
Serpens Sequence
J2000.0
18 21 02.16 -15 53 00.4  (275.25900 -15.88346) Search nearby
B1950.0 18 18 09.48 -15 54 26.1
Galactic coord. 15.378 -0.663
Other names

(Internal only)
ASASSN-V J182102.13-155300.1 OGLE-BLG-LPV-262250 OGLE-IV BLG780.09.44
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Variability type
M
Spectral type --
Mag. range
12.3 - 15.3 I
Discoverer --
Epoch
12 Oct 1961 (HJD 2437585.0) Ephemeris
Outburst --
Period 351.7 d
Rise/eclipse dur. --
Remarks
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1 GCVS Team In the region of the open cluster M 17 = NGC 6618.
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References
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1 Iwanek, P.; et al., 2022, The OGLE Collection of Variable Stars: Nearly
66,000 Mira Stars in the Milky Way		 2022ApJS..260...46I
2 B.V.Kukarkin, Manuscript, 1965. --
3 P.Maffei, Asiago Contr N146, 1963. --
External Links
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Location    Go   
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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 = 7.31H = 5.89K = 5.13J - K = 2.18
AllWISE W1 = 4.79W2 = 4.29W3 = 3.78W4 = 2.16W1 - W2 = 0.49W3 - W4 = 1.62
Images
Please review Digitized Sky Survey Acknowledgment and Copyright.
Size 5' x 5' (297 x 298 pixels)
Center 18 21 02.16 -15 53 00.4 (J2000)
Source STScI
Survey

Red, all sky, 1.0 arcsec/pixel
  Negative
Supporting Documents
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Stellar Association Membership
 NGC 6618 Open Cluster 2012A&A...548A..97Z
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
3 Otero, Sebastian Alberto 2023-02-21 21:50 UTC Period from 2022ApJS..260...46I. Gaia DR3 position.
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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