Alkurhah


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 Alkurhah, x Cep, 17 Cep, HR 8417, HD 209790, SAO 19827, WDS 22038+6438A
other names Al Kirdah, Kurhah
constellation Cepheus

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

note (category: star names): Alkurhah; Al Kirdah; Kurhah.

position, motion, parallax:

position (J2000) RA: 22h 3min 47,4sec DEC: +64 37' 40''
position (J1900) RA: 22h 0min 53,7sec DEC: +64 8' 26''
proper motion (J2000) RA: 0,209 arcsec/a DEC: 0,085 arcsec/a
radial velocity -6 km/s
note: spectroscopic binaries, double lined spectra
note: orbital data avaible
rotational velocity 20 km/s (uncertain) (variable)
trigonometric parallax 0,032 arcsec
note (category: radial and/or rotational velocities): Change of 7k/s in 55y needs confirmation.
note (category: dynamical parallaxes): 0.038".

magnitude

visual magnitude 4,29
(V on UBV Johnson system)

spectral / color information

spectral class A3/6Vm
B-V-magnitude 0,34
U-B-magnitude 0,09
R-I-magnitude 0,13
note (category: spectra): K/H/m yield classes A3/F1/F2 respectively.

double/multiple star system information

number of components of multiple star system 3
separation 7,7 arcsec
mag difference (of double or brightest multiple) 2
component ID AB
note (category: double and multiple data): AB 4.61 A3m, 6.5 F7V or F3III-IV, 3800y, a = 11.5". Aa, 2.254y, a = 0.073". Component B is HD 209791 = GC 30876, vsini =<25k/s. Component C, 12.7v at 97" optical.
note (category: spectroscopic binaries): ADS 15600A, 810.9d, K 7.1k/s, V0 -10.7k/s, msin3i 0.855, asini 70.3. sep. SB components 0.06". Resolved by speckle interferometry. Mass transfer. Secondary undermassive for its luminosity. vsini both components 20k/s.

miscellaneous information

note (category: group membership): Hyades group.

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

position, motion, parallax:

position (J2000) RA: 22h 3min 47,426sec DEC: +64 37' 40,24'' 1,24 arcsec source: 29
proper motion (J2000) RA: 0,0325 arcsec/a DEC: 0,085 arcsec/a source: 25
radial velocity -6 km/s source: 25
trigonometric parallax 0,032 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 106,16 latitude: 7,37
GCI unit vector (J2000) X: 0,374581 Y: -0,208082 Z: 0,903544

magnitude:

visual 4,29 (observed) source: 25
photovisual 4,6 source: 2
photographic 4,7 source: 2

spectral information:

spectral class A3 source: 29
Morgan-Keenan A3/6Vm source: 25
B-magnitude 4,63 0,05 B-V-magnitude 0,34
U-magnitude 4,72 0,05 U-B-magnitude 0,09

double/multiple star system information:

source of data: 19

component magnitude spectral class catalogue(s)/name(s)
A 4,29 A3 Alkurhah, x Cephei, 17 Cep, HR 8417, HD 209790, SAO 19827
B 6,44 A3

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
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
29 SAOJ2000
SAO on FK5 at J2000, 1989

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 22h 2min 20,44sec DEC: +64 23' 1,68'' 0,023 arcsec
position (J2000) RA: 22h 3min 47,426sec DEC: +64 37' 40,24''
proper motion J1950 (FK4) RA: 0,032 arcsec/a DEC: 0,089 arcsec/a 0,003 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0325 arcsec/a DEC: 0,085 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,6 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class A3
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: 30877
Durchmusterung BD+63 1802A
Boss General Catalogue 30877
Henry Draper Catalogue 209790

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

position and proper motion:

position (J2000) RA: 22h 3,8min DEC: +64 38'
proper motion (J2000) RA: 0,208 arcsec/a DEC: 0,089 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
Aa 1975 19 '' 4,3 - A3m MCA 69
Aa-B 1831 often 289 5,6'' 4,6 6,5 - STF2863
1994 275 8,5''
Aa-C 1912 2 199 95,3'' 4,6 12,7 - STF2863
1925 200 96,8''

discoverer information:

discoverer code discoverer reference
MCA 69 McAlister, H.A. -
STF2863 Struve, F.G.W. -

notes:

note Xi Cep. The primary is an astrometric and spectroscopic binary resolved by speckle interferometry. P = 2.25yr, a = 0.07", motion direct. A premature orbit has been computed for AB. Mt. Wilson spectrum of B F8s. Proper motion of B +187 +088. Spectrum of A: A3m.