q2Eridani


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 q2Eri, NSV 01002, HR 898, HD 18623, SAO 216114, WDS 02583-4018B
constellation Eridanus

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


position, motion, parallax:

position (J2000) RA: 2h 58min 16,3sec DEC: -40 18' 16''
position (J1900) RA: 2h 54min 28,9sec DEC: -40 42' 18''
proper motion (J2000) RA: -0,064 arcsec/a DEC: 0,018 arcsec/a
radial velocity 19 km/s
rotational velocity 100 km/s (uncertain) (variable)
trigonometric parallax 0,035 arcsec
note (category: dynamical parallaxes): 0.016".

magnitude

visual magnitude 4,35
(V on UBV Johnson system)

spectral / color information

spectral class A1V
B-V-magnitude 0,08
U-B-magnitude 0,12

variability information

variable star identification 1002

double/multiple star system information

separation 8,3 arcsec
mag difference (of double or brightest multiple) 1,1
note Worley (1978) update of the IDS
note (category: double and multiple data): Binary with HR 897.

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

position, motion, parallax:

position (J2000) RA: 2h 58min 16,408sec DEC: -40 18' 16,84'' 0,19 arcsec source: 16
proper motion (J2000) RA: -0,0015 arcsec/a DEC: -0,006 arcsec/a source: 25
radial velocity 19 km/s source: 25
trigonometric parallax 0,035 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 247,85 latitude: -60,73
GCI unit vector (J2000) X: 0,543298 Y: 0,535173 Z: -0,646852

magnitude:

visual 4,35 (observed) source: 25
photovisual 4,4 source: 2
photographic 4,5 source: 2

spectral information:

spectral class A2 source: 96
Morgan-Keenan A1V source: 25
B-magnitude 4,43 0,05 B-V-magnitude 0,08
U-magnitude 4,55 0,05 U-B-magnitude 0,12

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 8,3 arcsec
magnitude difference between brightest and second brightest component 1,1
position angle 91

component magnitude spectral class catalogue(s)/name(s)
A 3,24 A2 Acamar, q1Eridani, HR 897, HD 18622, SAO 216113
B 4,35 A2 q2Eridani, HR 898, HD 18623, SAO 216114

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: 2h 56min 22,578sec DEC: -40 30' 14,34'' 0,035 arcsec
position (J2000) RA: 2h 58min 16,301sec DEC: -40 18' 16,25''
proper motion J1950 (FK4) RA: -0,0062 arcsec/a DEC: 0,022 arcsec/a 0,005 arcsec/a in RA
0,007 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0056 arcsec/a DEC: 0,018 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

spectral class A2
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: 3586
Durchmusterung CD-40 771B
Boss General Catalogue 3586
Henry Draper Catalogue 18623

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

position and proper motion:

position (J2000) RA: 2h 58,3min DEC: -40 18'
proper motion (J2000) RA: -0,045 arcsec/a DEC: 0,019 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
- 1835 54 82 8,3'' 3,4 4,5 A4III A1V PZ 2
1990 91 -

discoverer information:

discoverer code discoverer reference
PZ 2 Piazzi, G. -

notes:

note Theta Eri. A is a spectroscopic binary. Proper motion of B -017 -006.

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

position:

position (J1950) RA: 2h 56min 22,6sec DEC: -40 30' 14''

variability informations:

variability type -
magnitute at max. brightness 2,91
magnitute at min. brightness
photometric system visual, photovisual or Johnson's V

spectral information

spectral class A3

references

to a study 0807D (designation: 48,49GERI)

miscanellous

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