WDS 18512+5923 STF 2420 BC : NOTES
 
 
discov_num notes refcode
STF2420 omi Dra = 47 Dra. A is a spectroscopic binary and also variable.
AB: Optical pair, based on study of relative motion of the components
using the method of apparent motion parameters. Kiy2008
AB: H 4 20. MEv2010
omi Dra Hipparcos astrometric solution adopted some elements from the orbit of HIP1997d
Young (1920). YRK1920
Ren & Fu (2013) calculated an astrometric orbit, combining Hipparcos Ren2013
Intermediate Astrometric Data with spectroscopic elements by
Young (1920). YRK1920
CIA 8 Aa,Ab: Roettenbacher et al. (2015) resolve the RS CVn binary omi Dra
and determined a combined spectroscopic/astrometric orbit. The orbital
parallax is 9.36 +/- 0.10 mas (106.8 +/- 1.1pc), flux ratio in H is
370 +/- 40, the system age 3.0 +/- 0.5 Gyr. Radii are 25.1 +/- 0.3 and
1.0 +/- 0.1 Rsun, luminosities 220 +/- 30 and 1.3 +/- 0.2 Lsun.
Derived masses are 1.35 +/- 0.05 and 0.99 +/- 0.02 Msun. CIA2015c
 
 
REFERENCES
 
 
refcode metd author reference
CIA2015c Kc j Roettenbacher, R.M., Monnier, J., Fekel, F.C., Henry, G.W., Korhonen, H., 2015ApJ...809..159R
CIA2015c Latham, D.W., Muterspaugh, M.W., Williamson, M.H., Baron, F.,
CIA2015c ten Brummelaar, T.A., Che, X., Harmon, R.O., et al.
CIA2015c ApJ 809, 159, 2015
HIP1997d orb - Hipparcos 1997yCat.1239....0E
HIP1997d Hipparcos Catalog, ESA SP-1200, 1997
HIP1997d (DMSA/O Orbital Solutions)
Kiy2008 - Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S. 2008SvAL...32..405K
Kiy2008 SvAL 34, 405, 2008
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Ren2013 orb - Ren, S. & Fu, Y. 2013AJ....145...81R
Ren2013 AJ 145, 81, 2013
YRK1920 orb - Young, R.K. 1920PDAO....1..263Y
YRK1920 Pub. Dom. Astr. Obs. 1, 263, 1920
 
 
DISCOVERER
 
 
idgroup discov author
1 STF Struve, F.G.W.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18512+5923 STF2420 BC 2000 3 326 104.0 8.26 12.70 185112.01+592317.8
18512+5923 STF2420 BC 2003 5 326 103.9 8.26 12.67 N 185108.98+592345.8
18512+5923 STF2420 BC 2015 6 326 103.5 8.26 12.67 K3IIIp N 185108.98+592345.8

If you need more information about this double, apply for a data request form to the WDS.