g1Delphini


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 g1Del, 12 Del, HR 7947, HD 197963, SAO 106475, WDS 20467+1607B
constellation Delphinus

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


position, motion, parallax:

position (J2000) RA: 20h 46min 38,7sec DEC: +16 7' 28''
position (J1900) RA: 20h 42min 0,3sec DEC: +15 45' 49''
proper motion (J2000) RA: -0,03 arcsec/a DEC: -0,191 arcsec/a
radial velocity -7 km/s
note: suspected variable radial velocity
rotational velocity =<25 km/s (uncertain) (variable)
trigonometric parallax 0,026 arcsec
note (category: dynamical parallaxes): 0.033".

magnitude

visual magnitude 5,14
(V on UBV Johnson system)

spectral / color information

spectral class F7V
B-V-magnitude 0,49
U-B-magnitude 0,08

double/multiple star system information

separation 9,8 arcsec
mag difference (of double or brightest multiple) 1
note (category: double and multiple data): 3249y, a = 13.813". Binary with HR 7948.

miscellaneous information

note (category: group membership): Wolf 630 group.

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

position, motion, parallax:

position (J2000) RA: 20h 46min 38,837sec DEC: +16 7' 26,95'' 0,5 arcsec source: 25
proper motion (J2000) RA: -0,0022 arcsec/a DEC: -0,197 arcsec/a source: 25
radial velocity -7 km/s source: 25
trigonometric parallax 0,026 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 61,5 latitude: -16,57
GCI unit vector (J2000) X: 0,638583 Y: -0,717693 Z: 0,27772

magnitude:

visual 5,14 (observed) source: 25
photovisual 5,5 source: 2
photographic 6,3 source: 2

spectral information:

spectral class F8 source: 29
Morgan-Keenan F7V source: 25
B-magnitude 5,63 0,05 B-V-magnitude 0,49
U-magnitude 5,71 0,05 U-B-magnitude 0,08

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 9,6 arcsec
magnitude difference between brightest and second brightest component 0,87
position angle 267

component magnitude spectral class catalogue(s)/name(s)
A 4,27 G5 g2Delphini, 12 Del, HR 7948, HD 197964, SAO 106476
B 5,14 F8 g1Delphini, 12 Del, HR 7947, HD 197963, SAO 106475

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
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
29 SAOJ2000
SAO on FK5 at J2000, 1989

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

position and proper motion:

position (J1950) RA: 20h 44min 19,473sec DEC: +15 56' 34,71'' 0,018 arcsec
position (J2000) RA: 20h 46min 38,737sec DEC: +16 7' 27,59''
proper motion J1950 (FK4) RA: -0,0022 arcsec/a DEC: -0,188 arcsec/a 0,006 arcsec/a in RA
0,007 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0021 arcsec/a DEC: -0,191 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 5,2 (accuracy: 1 decimal)
source of visual magnitude data Taken from AGK1.

spectral information:

spectral class F8
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue Yale Transactions 18, catalogue number: 8382
Durchmusterung BD+15 4255B
Boss General Catalogue 28965
Henry Draper Catalogue 197963

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

position and proper motion:

position (J2000) RA: 20h 46,7min DEC: +16 7'
proper motion (J2000) RA: -0,032 arcsec/a DEC: -0,197 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
- 1823 often 274 11,9'' 4,27 5,14 K1IV F7V STF2727
1988 267 9,6''

discoverer information:

discoverer code discoverer reference
STF2727 Struve, F.G.W. -

notes:

note Gamma Del. A premature orbit has been computed.