n2Coronae 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

catalogues and names n2CrB, NSV 20608, 21 CrB, HR 6108, HD 147767, SAO 65259, WDS 16224+3348B
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 29,2sec DEC: +33° 42' 13''
position (J1900) RA: 16h 18min 43,1sec DEC: +33° 56' 10''
proper motion (J2000) RA: -0,007 arcsec/a DEC: 0,059 arcsec/a
radial velocity -40 km/s
note: variable radial velocity
rotational velocity <17 km/s (uncertain) (variable)
trigonometric parallax 0,021 arcsec

magnitude

visual magnitude 5,39
(V on UBV Johnson system)

spectral / color information

spectral class K5III
B-V-magnitude 1,53
U-B-magnitude 1,88
R-I-magnitude 0,87

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

position, motion, parallax:

position (J2000) RA: 16h 22min 29,201sec DEC: +33° 42' 12,81'' ±0,43 arcsec source: 16
proper motion (J2000) RA: -0,0007 arcsec/a DEC: 0,056 arcsec/a source: 25
radial velocity -40 km/s source: 25
trigonometric parallax 0,021 ±0,002 arcsec source: 25
galactic coord. (B1950) longitude: 54,68° latitude: 44,51°
GCI unit vector (J2000) X: -0,343383 Y: -0,757746 Z: 0,554896

magnitude:

visual 5,39 (observed) source: 25
photovisual 5,3 source: 2
photographic 6,5 source: 16

spectral information:

spectral class K5 source: 96
Morgan-Keenan K5III source: 25
B-magnitude 6,92 ±0,05 B-V-magnitude 1,53
U-magnitude 8,8 ±0,05 U-B-magnitude 1,88

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 102,4 arcsec
magnitude difference between brightest and second brightest component 4,8
position angle 16 °

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
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 36,066sec DEC: +33° 49' 7,65'' ±0,021 arcsec
position (J2000) RA: 16h 22min 29,22sec DEC: +33° 42' 13,29''
proper motion J1950 (FK4) RA: -0,0008 arcsec/a DEC: 0,056 arcsec/a ±0,004 arcsec/a in RA
±0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0005 arcsec/a DEC: 0,059 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 5,3 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class K5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue GC, catalogue number: 22029
Durchmusterung BD+34 2774
Boss General Catalogue 22029
Henry Draper Catalogue 147767

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.