38 Geminorum
catalogues and names
catalogues and names | NSV 03266, 38 Gem, HR 2564, HD 50635, SAO 96265, BD +13 1462, WDS 06546+1311A |
constellation | Gemini |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 6h 54min 38,7sec | DEC: +13° 10' 40'' | ||
position (2001,21) | RA: 6h 54min 43sec | DEC: +13° 10' 34'' | ||
position (B1900) | RA: 6h 49min 0,1sec | DEC: +13° 18' 18'' | ||
proper motion (J2000) | RA: 0,078 arcsec/a | DEC: -0,083 arcsec/a | ||
radial velocity | 24 km/s note: spectroscopic binaries |
|||
rotational velocity | 126 km/s (uncertain) (variable) | |||
trigonometric parallax | 0,043 arcsec | |||
galactic coordinates | longitude: 201,51° | latitude: 6,67° |
note (category: radial and/or rotational velocities): | ADS 5559B, 23k/s. |
note (category: dynamical parallaxes): | 0.029". |
magnitude
visual magnitude | 4,65 (V on UBV Johnson system) |
spectral / color information
spectral class | F0Vp |
B-V-magnitude | 0,3 |
U-B-magnitude | 0,07 |
R-I-magnitude |
variability information
variable star identification | 3266 |
double/multiple star system information
number of components of multiple star system | 3 |
separation | 7 arcsec |
mag difference (of double or brightest multiple) | 2,9 |
component ID | AB |
note (category: double and multiple data): | AB 4.8 A9Vp, 7.6 G6V, 1943.8y, a = 8.194". Combined mag., colors. |
note (category: spectroscopic binaries): | ADS 5559A. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 6h 54min 38,648sec | DEC: +13° 10' 39,65'' | ±0,35 arcsec | source: 17 |
position (2001,21) | RA: 6h 54min 43sec | DEC: +13° 10' 34'' | JD: 2451987,37 | |
proper motion (J2000) | RA: 0,005 arcsec/a | DEC: -0,086 arcsec/a | source: 25 | |
radial velocity | 24 km/s | source: 25 | ||
trigonometric parallax | 0,043 arcsec | ±0,004 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 201,51° | latitude: 6,67° |
magnitude:
visual | 4,74 (observed) | source: 25 |
photovisual | 4,7 | source: 2 |
photographic | 5 | source: 16 |
spectral information:
spectral class | F0 | source: 96 | |
Morgan-Keenan | F0Vp | source: 25 | |
B-magnitude | 5,05 ±0,05 | B-V-magnitude | 0,31 |
U-magnitude | 5,08 ±0,05 | U-B-magnitude | 0,03 |
double/multiple star system information:
separation between brightest and second brightest component | 7,3 arcsec |
magnitude difference between brightest and second brightest component | 2,94 |
position angle | 147 ° |
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 | |
17 | ACRS |
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
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 (B1950) | RA: 6h 51min 49,416sec | DEC: +13° 14' 34,72'' | ±0,013 arcsec |
position (2001,21) | RA: 6h 54min 42sec | DEC: +13° 10' 39'' | JD: 2451987,37 |
position (J2000) | RA: 6h 54min 38,682sec | DEC: +13° 10' 39,92'' | |
proper motion B1950 (FK4) | RA: 0,0053 arcsec/a | DEC: -0,084 arcsec/a | ±0,003 arcsec/a in RA ±0,002 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0,0053 arcsec/a | DEC: -0,082 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 4,7 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
spectral class | F0 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
Double star in Aitken's Double Star Catalogue (Aitken 1932) |
catalogues
source catalogue | GC, catalogue number: 9049 |
Durchmusterung | BD+13 1462 |
Boss General Catalogue | 9049 |
Henry Draper Catalogue | 50635 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
position (J2000) | RA: 6h 54,6min | DEC: +13° 11' |
proper motion (J2000) | RA: 0,073 arcsec/a | DEC: -0,086 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 | 1822 | often | 179° | 5,7'' | 4,74 | 7,68 | F0Vp | STF 982 |
1990 | 147° | 7,3'' | ||||||
AC | 1912 | 2 | 328° | 109,3'' | 4,7 | 10,3 | - | STF 982 |
1932 | - | 111,5'' |
discoverer information:
discoverer code | discoverer | reference |
STF 982 | Struve, F.G.W. | - |
notes:
note | 38 Gem. A is a Delta Scuti-type variable. A premature orbit has been computed for AB. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
position (B1900) | RA: 6h 49min | DEC: +13° 18' |
magnitudes, spectral classes, orbital elements:
author: | J. Hopmann |
magnitude of component A: | 4,74 |
magnitude of component B: | 4,74 |
spectral class component B: | F0Vp |
spectral class component B: | F0Vp |
period [y]: | 1943,8 |
semi-major axis [arcsec]: | 8,194 |
inclination [deg]: | 125,54 |
node [deg]: | 36,75 |
equinox of node: | 1900 |
eccentricity: | 0,15 |
time of periastron passage: | 2276 |
grade: | indeterminate |
reference: | Mitt. Wien No. 17, 1974. |
other name(s) | STF 982, 38 Gem |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 6h 51min 49,4sec | DEC: +13° 14' 35'' |
variability informations:
variability type | - |
magnitute at max. brightness | 4,64 |
magnitute at min. brightness | |
photometric system | visual, photovisual or Johnson's V |
spectral information
spectral class | * |
references
to a study | 0132D (designation: 982) |
miscanellous
There are notes in the published catalog (Kukarkin et al.(1982)). |