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Name
  alf Sco  
AAVSO UID
000-BBX-552 (1715 observations)  
Constellation
Scorpius Sequence
J2000.0
16 29 24.46 -26 25 55.2  (247.35192 -26.43200) Search nearby
B1950.0 16 26 20.29 -26 19 21.9
Proper motion
RA: -12.11 +/- 1.22 mas/yDec: -23.30 +/- 0.76 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 351.947 +15.064
Other names

(Internal only)
21 Sco AAVSO 1623-26 ADS 10074 A
Antares CD-26 11359 CPD-26 5648
HD 148478 HIP 80763 HR 6134
IRC -30265 RAFGL 1863 SAO 184415
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Variability type
SRC
Spectral type M1.5Iab-Ib
Mag. range
0.75 - 1.21 V
Discoverer --
Epoch
12 Aug 2009 (HJD 2455056) Ephemeris
Outburst --
Period 2180 d  (5.97 y)
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Antares B: V= 5.37; B-V= -0.11; spectral type B4Ve; sep. 2.9". Antares A range given (Combined mags. = 0.73 - 1.19 V). Analysis of AAVSO V and Otero visual data gives a main period of 2180 d. consistent with the spectroscopic period of 2167 d. found in 2013AJ....145...38P. The most likely explanation would be a LSP (Long Secondary Period) for which they predicted a 0.2 mag. amplitude and a temperature minimum in 2009. A 0.2 mag. minimum is indeed found in the long-term light curve in 2009. No traces of the periods around 1700 d. previously published were found but possible periods of 109 and 315 d. are present in the data. However, there are too few observations so more data are needed to confirm them. Elements in the table are for the minima of the LSP.
2 GCVS Team ADS 10074 A(B 5.1m, B4Ve, A = 2.9", Porb = 878 yr.). Connected with a nebula.
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References
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1 Pugh, T.; Gray, D. F., 2013, On the Six-year Period in the Radial Velocity
of Antares A
2013AJ....145...38P
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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 = -2.85H = -3.73K = -4.10J - K = 1.25
AllWISE W1 = -1.23W4 = -4.28
Images
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Supporting Documents
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2 Alpha Sco JD light curve Otero, Sebastian Alberto 2014-04-29 02:39 UTC Light curve with V observations from different AAVSO observers and visual data from Otero.
1 Alpha Sco Long Secondary Period Otero, Sebastian Alberto 2014-04-29 02:23 UTC Light curve of the LSP of alpha Sco with V data from different AAVSO observers and visual data from Otero.
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Revision History
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3 Otero, Sebastian Alberto 2014-04-29 02:23 UTC Type, period, epoch and range from AAVSO V and Otero visual data.
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.