39 Dra


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0


catalogues and names 39 Dra, HR 6923, HD 170073, SAO 30949, WDS 18239+5848A
constellation Draco

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)


position, motion, parallax:

position (J2000) RA: 18h 23min 54,5sec DEC: +58 48' 2''
position (J1900) RA: 18h 22min 26,9sec DEC: +58 44' 34''
proper motion (J2000) RA: -0,039 arcsec/a DEC: 0,06 arcsec/a
radial velocity -15 km/s
note: spectroscopic binaries
rotational velocity 175 km/s (uncertain) (variable)
trigonometric parallax 0,035 arcsec
note (category: dynamical parallaxes): 0.013".

magnitude

visual magnitude 4,98
(V on UBV Johnson system)

spectral / color information

spectral class A1V
B-V-magnitude 0,08
U-B-magnitude 0,04
R-I-magnitude 0,02
note (category: spectra): Metal weak.

double/multiple star system information

number of components of multiple star system 8
separation 3,8 arcsec
mag difference (of double or brightest multiple) 2,8
component ID AB
note (category: double and multiple data): AB binary with slow orbital motion. Combined mag., colors. B is A5p, vsini 80k/s. C, 7.1v F6V at 90" CPM. Some discordance whether B or C is the brighter.
note (category: spectroscopic binaries): ADS 11336A.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 18h 23min 54,645sec DEC: +58 48' 2,78'' 0,43 arcsec source: 16
proper motion (J2000) RA: -0,0039 arcsec/a DEC: 0,061 arcsec/a source: 25
radial velocity -15 km/s source: 25
trigonometric parallax 0,035 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 87,88 latitude: 26,44
GCI unit vector (J2000) X: 0,053947 Y: -0,515199 Z: 0,855371

magnitude:

visual 4,98 (observed) source: 25
photovisual 4,9 source: 2
photographic 4,9 source: 16

spectral information:

spectral class A2 source: 96
Morgan-Keenan A1V source: 25
B-magnitude 5,06 0,05 B-V-magnitude 0,08
U-magnitude 5,1 0,05 U-B-magnitude 0,04

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 3,8 arcsec
magnitude difference between brightest and second brightest component 2,5
position angle 351

component magnitude spectral class catalogue(s)/name(s)
A 4,98 A2 39 Dra, HR 6923, HD 170073, SAO 30949
B 7,9 F8

sources:

2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
16 PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
19 WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
96 SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 18h 23min 10,673sec DEC: +58 46' 16,5'' 0,009 arcsec
position (J2000) RA: 18h 23min 54,545sec DEC: +58 48' 2,34''
proper motion J1950 (FK4) RA: -0,0057 arcsec/a DEC: 0,061 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,005 arcsec/a DEC: 0,06 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class A2
source of spectral data Taken from the HD with M stars reclassified by Miss Cannon.

catalogues

source catalogue FK3, catalogue number: 694
Durchmusterung BD+58 1809
Boss General Catalogue 25151
Henry Draper Catalogue 170073

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 18h 23,9min DEC: +58 48'
proper motion (J2000) RA: -0,037 arcsec/a DEC: 0,062 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
AB 1833 71 6 3,1'' 5,1 7,6 A1V STF2323
1975 351 3,8''
AC 1834 28 21 88,9'' 5,1 7,9 - STF2323
AE 1880 2 66 198'' 4,8 10,8 - STF2323
AF 1910 1 80 150,3'' 4,8 11,1 - STF2323
AG 1918 1 254 36'' 4,8 14,1 - STF2323
AH 1918 1 86 41,3'' 4,8 14,1 - STF2323
BC 1903 3 22 85,6'' 7,9 7,3 - STF2323

discoverer information:

discoverer code discoverer reference
STF2323 Struve, F.G.W. -

notes:

note 39 Dra. A is a double-lined spectroscopic binary. C is physical, and is a spectroscopic binary, P =2.71d.