Nekkar
catalogues and names | Nekkar, b Boo, NSV 06898, 42 Boo, HR 5602, HD 133208, SAO 45337, FK5: 555 |
other names | Merez, Meres |
constellation | Bootes |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
note (category: star names): | Nekkar; Merez; Meres. |
position, motion, parallax:
position (J2000) | RA: 15h 1min 56,8sec | DEC: +40° 23' 26'' |
position (J1900) | RA: 14h 58min 10,7sec | DEC: +40° 47' 6'' |
proper motion (J2000) | RA: -0,041 arcsec/a | DEC: -0,028 arcsec/a |
radial velocity | -20 km/s note: suspected variable radial velocity |
|
rotational velocity | <17 km/s (uncertain) (variable) | |
trigonometric parallax | 0,037 arcsec |
magnitude
visual magnitude | 3,5 (V on UBV Johnson system) |
spectral / color information
spectral class | G8IIIaBa0.3Fe-0.5 |
B-V-magnitude | 0,97 |
U-B-magnitude | 0,72 |
R-I-magnitude | 0,44 |
variability information
variable star identification | 6898 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 15h 1min 56,757sec | DEC: +40° 23' 26,1'' | ±0,06 arcsec | source: 15 |
proper motion (J2000) | RA: -0,0036 arcsec/a | DEC: -0,028 arcsec/a | source: 25 | |
radial velocity | -20 km/s | source: 25 | ||
trigonometric parallax | 0,037 | ±0,004 arcsec | source: 25 | |
galactic coord. (B1950) | longitude: 67,61° | latitude: 60,04° | ||
GCI unit vector (J2000) | X: -0,533972 | Y: -0,543118 | Z: 0,647995 |
magnitude:
visual | 3,5 (observed) | source: 25 |
photovisual | 3,6 | source: 2 |
spectral information:
spectral class | G5 | source: 96 | |
Morgan-Keenan | G8IIIaFe-0.5 | source: 25 | |
B-magnitude | 4,47 ±0,05 | B-V-magnitude | 0,97 |
U-magnitude | 5,19 ±0,05 | U-B-magnitude | 0,72 |
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 | |
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: 15h 0min 3,664sec | DEC: +40° 35' 12,8'' | ±0,004 arcsec |
position (J2000) | RA: 15h 1min 56,75sec | DEC: +40° 23' 26'' | |
proper motion J1950 (FK4) | RA: -0,004 arcsec/a | DEC: -0,032 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0,0036 arcsec/a | DEC: -0,028 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 3,6 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
spectral class | G5 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | FK4, catalogue number: 555 |
Durchmusterung | BD+40 2840 |
Boss General Catalogue | 20226 |
Henry Draper Catalogue | 133208 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
position (J1950) | RA: 15h 0min 3,7sec | DEC: +40° 35' 13'' |
variability informations:
magnitute at max. brightness | 3,47 |
magnitute at min. brightness | 3,5 |
photometric system | visual, photovisual or Johnson's V |
spectral information
spectral class | G8 |
references
to a study | 631147D (designation: BETA BOO) |