Altarf

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

  5. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names Altarf, b Cnc, NSV 03973, 17 Cnc, HR 3249, HD 69267, SAO 116569, FK5: 312, WDS 08165+0911
other names Al Tarf
constellation Cancer

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

note (category: star names): Altarf; Al Tarf.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 8h 16min 30,9sec DEC: +9° 11' 8''
position (J1900) RA: 8h 11min 5,5sec DEC: +9° 29' 38''
proper motion (J2000) RA: -0,044 arcsec/a DEC: -0,049 arcsec/a
radial velocity 22 km/s
note: suspected variable radial velocity
rotational velocity <17 km/s (uncertain) (variable)
trigonometric parallax 0,012 arcsec

magnitude

visual magnitude 3,52
(V on UBV Johnson system)

spectral / color information

spectral class K4IIIBa0.5
B-V-magnitude 1,48
U-B-magnitude 1,77
R-I-magnitude 0,78

variability information

variable star identification 3973

double/multiple star system information

separation 29,2 arcsec
mag difference (of double or brightest multiple) 9,4
note (category: double and multiple data): CPM.

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

position, motion, parallax:

position (J2000) RA: 8h 16min 30,928sec DEC: +9° 11' 7,9'' ±0,06 arcsec source: 15
proper motion (J2000) RA: -0,003 arcsec/a DEC: -0,049 arcsec/a source: 25
radial velocity 22 km/s source: 25
trigonometric parallax 0,012 ±0,001 arcsec source: 25
galactic coord. (B1950) longitude: 214,26° latitude: 23,05°
GCI unit vector (J2000) X: -0,553861 Y: 0,817163 Z: 0,159632

magnitude:

visual 3,52 (observed) source: 25
photovisual 3,8 source: 2

spectral information:

spectral class K2 source: 96
Morgan-Keenan K4IIIBa0.5 source: 25
B-magnitude 5 ±0,05 B-V-magnitude 1,48
U-magnitude 6,77 ±0,05 U-B-magnitude 1,77

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 29,2 arcsec
magnitude difference between brightest and second brightest component 10,8
position angle 294 °

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
15 FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 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 (J1950) RA: 8h 13min 48,282sec DEC: +9° 20' 27,73'' ±0,003 arcsec
position (J2000) RA: 8h 16min 30,933sec DEC: +9° 11' 7,89''
proper motion J1950 (FK4) RA: -0,003 arcsec/a DEC: -0,052 arcsec/a ±0,001 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0029 arcsec/a DEC: -0,049 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,8 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class K2
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 312
Durchmusterung BD+09 1917
Boss General Catalogue 11254
Henry Draper Catalogue 69267

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

position and proper motion:

position (J2000) RA: 8h 16,5min DEC: +9° 11'
proper motion (J2000) RA: -0,044 arcsec/a DEC: -0,049 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
- 1889 5 294° 29,2'' 3,52 14,3 K4III BU 1065

discoverer information:

discoverer code discoverer reference
BU 1065 Burnham, S.W. -

notes:

note Beta Cnc. Burnham measured BD+09@1922 and BD+09@1926 with respect to A (see ADS). A may be variable.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (J1950) RA: 8h 13min 48,3sec DEC: +9° 20' 28''

variability informations:

magnitute at max. brightness 3,5
magnitute at min. brightness 3,58
photometric system visual, photovisual or Johnson's V

spectral information

spectral class K4

references

to a study 662019D (designation: HR 3249)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).