2015AJ....150..140M

Query : 2015AJ....150..140M

2015AJ....150..140M - Astron. J., 150, 140 (2015/November-0)

Predicting the α Comae Berenices time of eclipse: how 3 ambiguous measurements out of 609 caused a 26 year binary's eclipse to be missed.

MUTERSPAUGH M.W., WIJNGAARDEN M.J.P., HENRICHS H.F., LANE B.F., HARTKOPF W.I., HENRY G.W., SCHAEFER G.H., FARRINGTON C., HUMMEL C.A. and ZAVALA R.T.

Abstract (from CDS):

The dwarf stars in the 26 year period binary α Com were predicted to eclipse each other in early 2015. That prediction was based on an orbit model made with over 600 astrometric observations using micrometers, speckle interferometry, and long baseline optical interferometry. Unfortunately, it has been realized recently that the position angle measurements for three of the observations from ∼100 years ago were in error by 180°, which warped the orbital fit. The eclipse was likely 2 months earlier than predicted (MJD 56979, 2014 November 18 UT, 7 days before the first photometric observations of this system for the season were made at Fairborn Observatory), at which point the system was low on the horizon at sunrise.

Abstract Copyright: ∼

Journal keyword(s): astrometry

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * alf Com ** 13 09 59.28520 +17 31 46.0389 4.71 4.77 4.32 4.1   F5V+F6V 213 0

Query : 2015AJ....150..140M

Basic data :
* alf Com -- Double or Multiple Star
Other object types: otypes_help 		* (*,AG,...), ** (CCDM,**,...), PM* (2016ApJ,Ci,...), X (RBS,RE,...), V* (CSV,NSV,...), UV (2EUVE,EUVE,...), MIR (AKARI,WISEA,...), NIR (2MASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		13 09 59.28520 +17 31 46.0389 (Optical) [ 6.17 4.51 90 ] A 2007A&A...474..653V
FK4 coord. (ep=B1950 eq=1950) : 		13 07 33.32666 +17 47 36.3016 [ 6.17 4.51 90 ]
Gal coord. (ep=J2000) : 		327.93345531 +79.48938368 [ 6.17 4.51 90 ]
Proper motions mas/yr : 		-433.13 141.24 [0.70 0.51 0] A 2007A&A...474..653V
Radial velocity / Redshift / cz : 		V(km/s) -18.826 [0.0016] / z(spectroscopic) -0.000063 [0.000000] / cz -18.83 [0.00]
   (Opt) A 2018A&A...616A...7S
Parallaxes (mas): 		56.10 [0.89] A 2007A&A...474..653V
Spectral type: 		F5V+F6V C 2013MNRAS.428.3104E
Fluxes (11) :
U 4.71 [~] C 2014JAVSO..42..443M
B 4.77 [~] C 2014JAVSO..42..443M
V 4.32 [~] C 2014JAVSO..42..443M
R 4.1 [~] E 2003AJ....125..984M
G 4.656462 [0.014337] C 2020yCat.1350....0G
J 3.40 [0.24] D 2003yCat.2246....0C
H 3.27 [0.22] D 2003yCat.2246....0C
K 3.11 [0.25] D 2003yCat.2246....0C
u 5.52 [~] C 2014JAVSO..42..443M
g 4.47 [~] C 2014JAVSO..42..443M
r 4.23 [~] C 2014JAVSO..42..443M
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 2 		Display criteria :

Identifiers (55) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

CCDM J13100+1732AB EUVE J1310+17.5 NAME Diadem TD1 16671
* 42 Com GC 17833 NLTT 33105 TIC 138128530
* alf Com GCRV 7832 NSV 6116 UBV 11895
** STF 1728AB GCRV 63887 PLX 3006 USNO-B1.0 1075-00257793
ADS 8804 AB GEN# +1.00114378 PLX 3006.00 uvby98 100114378
AG+17 1350 GJ 501.0 PPM 129630 WDS J13100+1732AB
AKARI-IRC-V1 J1309590+173147 HIC 64241 RBS 1225 WEB 11357
ASCC 868407 HIP 64241 RE J130959+173150 WISEA J130958.98+173147.5
BD+18 2697 IDS 13051+1803 AB ROT 1938 WISE J130958.97+173146.5
Ci 20 762 IRAS 13075+1747 RX J1309.9+1731 YZ 17 4848
CNS5 3241 IRAS F13075+1747 RX J1310.0+1731 [ZEH2003] RX J1309.9+1731 1
CSI+18 2697 1 LSPM J1309+1731 1RXS J130959.3+173136 AAVSO 1305+18
CSV 102722 LTT 13802 SAO 100443 Gaia DR3 3937881211045638400
2EUVE J1310+17.5 2MASS J13095936+1731456 SKY# 24360

References (213 between 1850 and 2026) (Total 213)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 25    Rot : 1    Fe/H : 10    Plx : 3    PM : 7    SpT : 3   

   

Observing logs
Herschel : 2   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : * alf Com

Link by name to the catalogue in VizieR :

CCDM J13100+1732AB AG+17 1350 AKARI-IRC-V1 J1309590+173147 BD+18 2697 EUVE J1310+17.5
GJ 501.0 HIC 64241 HIP 64241 IRAS 13075+1747 IRAS F13075+1747
LSPM J1309+1731 2MASS J13095936+1731456 NLTT 33105 NSV 6116 PLX 3006
PPM 129630 1RXS J130959.3+173136 SAO 100443 TD1 16671 USNO-B1.0 1075-00257793
uvby98 100114378 WDS J13100+1732AB WISEA J130958.98+173147.5 WISE J130958.97+173146.5 Gaia DR3 3937881211045638400

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