o2Eridani


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 o2Eri, NSV 15931, 40 Eri, HR 1325, HD 26965, SAO 131063, WDS 04153-0739A
constellation Eridanus

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

note (category: star names): Keid; Kied.

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

position, motion, parallax:

position (J2000) RA: 4h 15min 16,3sec DEC: -7 39' 10''
position (J1900) RA: 4h 10min 40,2sec DEC: -7 48' 30''
proper motion (J2000) RA: -2,242 arcsec/a DEC: -3,414 arcsec/a
radial velocity -42 km/s
note: variable radial velocity
trigonometric parallax 0,209 arcsec
note (category: dynamical parallaxes): 0.199".

magnitude

visual magnitude 4,43
(V on UBV Johnson system)

spectral / color information

spectral class K1-V
B-V-magnitude 0,82
U-B-magnitude 0,45
R-I-magnitude 0,45

variability information

variable star identification DY Eri
note (category: variability): ADS 3093C; UV, min. 11.18V, +1.50 (B-V), 12.16 - 13.85U. X-ray source.

double/multiple star system information

number of components of multiple star system 5
separation 83,4 arcsec
mag difference (of double or brightest multiple) 5
component ID AB
note (category: double and multiple data): BC 9.51 A2, 11.18 M4Ve, 252.1y, a = 6.943". Component B is white dwarf. Component A, CPM.

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

position, motion, parallax:

position (J2000) RA: 4h 15min 16,314sec DEC: -7 39' 9,88'' 0,19 arcsec source: 33
proper motion (J2000) RA: -0,1506 arcsec/a DEC: -3,411 arcsec/a source: 25
radial velocity -42 km/s source: 25
trigonometric parallax 0,209 0,021 arcsec source: 25
galactic coord. (B1950) longitude: 200,72 latitude: -38
GCI unit vector (J2000) X: 0,437295 Y: 0,889404 Z: -0,133169

magnitude:

visual 4,43 (observed) source: 25
photovisual 4,5 source: 2
photographic 5,3 source: 2

spectral information:

spectral class G5 source: 96
Morgan-Keenan K0.5V source: 25
B-magnitude 5,25 0,05 B-V-magnitude 0,82
U-magnitude 5,7 0,05 U-B-magnitude 0,45

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 83,4 arcsec
magnitude difference between brightest and second brightest component 5,3
position angle 104

component magnitude spectral class catalogue(s)/name(s)
A 4,43 G5 o2Eridani, 40 Eri, HR 1325, HD 26965, SAO 131063
B 9,51 A

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
33 Hipparcos Main Input Catalogue Version 2
Turon, C., et al., The Hipparcos Input Catalogue, Version 2, CDS Bull. No. 43, p.5, 1993
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: 4h 12min 58,161sec DEC: -7 43' 45,89'' 0,01 arcsec
position (J2000) RA: 4h 15min 16,321sec DEC: -7 39' 9,89''
proper motion J1950 (FK4) RA: -0,1501 arcsec/a DEC: -3,42 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,1507 arcsec/a DEC: -3,411 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

spectral class G5
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: 5138
Durchmusterung BD-07 780
Boss General Catalogue 5138
Henry Draper Catalogue 26965

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

position and proper motion:

position (J2000) RA: 4h 15,3min DEC: -7 39'
proper motion (J2000) RA: 0 arcsec/a DEC: 0 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
A-BC 1825 58 107 83,5'' 4,43 9,7 G9V STF 518
1970 104 83,4''
Aa 1850 12 197 128,3'' 4,43 12,2 G5 STF 518
1907 51 114,2''
Ab 1850 5 279 99,4'' 4,43 12,5 G5 STF 518
1907 8 211''
BC 1851 often 157 3,9'' 9,52 11,17 DA dM4e STF 518
1994 338 8,9''
BP 1922 1 196 147'' 9,7 - - STF 518
Bb 1922 1 356 279,5'' 9,7 - A STF 518

discoverer information:

discoverer code discoverer reference
STF 518 Struve, F.G.W. -

notes:

note Omicron (2) Eri. Proper motion of A -2224 -3423. BC: P = 252yr., a = 6.94", motion retrograde. B is a white dwarf, and C is a flare star, DY Eri, and a strong X-ray source. Omicron (1) Eri at 83" is physical, and is a Delta Scuti star showing coronal X-ray emission.