n1Coronae Borealis


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 n1CrB, NSV 07676, 20 CrB, HR 6107, HD 147749, SAO 65257, WDS 16224+3348A
constellation Corona Borealis

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


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

position, motion, parallax:

position (J2000) RA: 16h 22min 21,4sec DEC: +33 47' 57''
position (J1900) RA: 16h 18min 35,5sec DEC: +34 2' 4''
proper motion (J2000) RA: 0,007 arcsec/a DEC: -0,037 arcsec/a
radial velocity -13 km/s
note: variable radial velocity
trigonometric parallax 0,003 arcsec

magnitude

visual magnitude 5,2
(V on UBV Johnson system)

spectral / color information

spectral class M2IIIab
B-V-magnitude 1,6
U-B-magnitude 1,94
R-I-magnitude 0,87 (Eggen)

variability information

variable star identification 7676

double/multiple star system information

number of components of multiple star system 4
separation 364,4 arcsec
mag difference (of double or brightest multiple) 0,1
component ID AB
note Worley (1978) update of the IDS

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

position, motion, parallax:

position (J2000) RA: 16h 22min 21,439sec DEC: +33 47' 56,66'' 0,35 arcsec source: 17
proper motion (J2000) RA: 0,0008 arcsec/a DEC: -0,038 arcsec/a source: 25
radial velocity -13 km/s source: 25
trigonometric parallax 0,003 - source: 25
galactic coord. (B1950) longitude: 54,81 latitude: 44,55
GCI unit vector (J2000) X: -0,343428 Y: -0,756708 Z: 0,556282

magnitude:

visual 5,2 (observed) source: 25
photovisual 5,4 source: 2
photographic 6,7 source: 16

spectral information:

spectral class M0 source: 96
Morgan-Keenan M2IIIab source: 25
B-magnitude 6,8 0,05 B-V-magnitude 1,6
U-magnitude 8,74 0,05 U-B-magnitude 1,94

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 364,4 arcsec
magnitude difference between brightest and second brightest component 0,19
position angle 165

component magnitude spectral class catalogue(s)/name(s)
A 5,2 M0 n1Coronae Borealis, 20 CrB, HR 6107, HD 147749, SAO 65257
B 5,39 K5 n2Coronae Borealis, 21 CrB, HR 6108, HD 147767, SAO 65259

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 (J1950) RA: 16h 20min 28,367sec DEC: +33 54' 56,32'' 0,018 arcsec
position (J2000) RA: 16h 22min 21,44sec DEC: +33 47' 56,65''
proper motion J1950 (FK4) RA: 0,0003 arcsec/a DEC: -0,04 arcsec/a 0,003 arcsec/a in RA
0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0006 arcsec/a DEC: -0,037 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 5,4 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class M0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue GC, catalogue number: 22026
Durchmusterung BD+34 2773
Boss General Catalogue 22026
Henry Draper Catalogue 147749

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

position and proper motion:

position (J2000) RA: 16h 22,4min DEC: +33 48'
proper motion (J2000) RA: 0,01 arcsec/a DEC: -0,038 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 1835 10 166 371,9'' 5,2 5,39 M2IIIab STF 29
1922 165 364,4''
Aa 1879 4 238 68,8'' 5,2 11,1 - H 81
Ab 1913 2 154 281,7'' 5,2 12,7 - STF 29
1936 152 180''
Bb 1879 5 16 104,6'' 5,39 10,2 K5III H 18
1921 - 102,4''

discoverer information:

discoverer code discoverer reference
STF 29 Struve, F.G.W. -
H 81 Herschel, W. -
H 18 Herschel, W. -

notes:

note AB: Nu (1) CrB. Aa: H N 81. Bb: H VI 18. Nu (1) and Nu (2) CrB.

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

position:

position (J1950) RA: 16h 20min 28,3sec DEC: +33 54' 57''

variability informations:

magnitute at max. brightness 5,2
magnitute amplitude 0,08
photometric system visual, photovisual or Johnson's V

spectral information

spectral class M2

references

to a study 300015D (designation: HR 6107)