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auriga

13 Apr 2011 14:42



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se pare ca 19 Dra este destul de interesanta. 
19 Dra = h Draconis = HIP 82860 = Tyc 4197-2429-1 = HD 153597 

CdC cu WDS nu o arata ca fiind dubla, totusi am mai gasit ceva pe internet:

"The 19 Draconis system (HR 6315, HD 153597, HIP 82860) consists of a F6V star with V = 4.89 co-orbiting with an unseen companion. With only nine RV observations, we could not constrain the orbital period, so we adopted P = 52.1089 days from Abt & Levy (1976) but let all other orbital parameters vary in the fitting algorithm. Figure 9 shows the RV points and the resulting orbit, with parameters Tperi = 54 522.258 ± 0.121 days, V0 = –20.5299 ± 0.0649 km s–1, K = 17.1590 ± 0.0344 km s–1, e = 0.2218 ± 0.0020, and ω = 3391 ± 06. The uncertainty on the value of K yields a fractional uncertainty ΔK/K of 0.20%".

O alta informatie utila aici http://www.solstation.com/stars2/cm-dra3.htm
se pare ca e una din cele mai apropiate stele aflate de noi la 49.2 ly.
19 Draconis AB	F6 V ?	7.2

USNO:
16560+6508   19 Dra      Hipparcos astrometric solution adopted some elements from the orbit of  HIP1997d
                         Abt & Levy (1976). 

Aladin:
cu NED da urmatorul rezultat:
http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=19+Dra&extend=yes
cu SIMBAD:
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=19+Dra


eu am incercat sa o splitez, bineinteles fara nici un rezultat. dar 20 Dra din apropiere am reusit.
o supozitie: s-ar putea ca pe vremea lui Lockier sa se fi vazut companionul si acum nu.