e Equulei


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. 4th Catalog of Orbits of Visual Binaries


catalogues and names e Equ, 1 Equ, HR 8034, HD 199766, SAO 126428, WDS 20591+0418A
constellation Equuleus

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


position, motion, parallax:

position (J2000) RA: 20h 59min 4,4sec DEC: +4 17' 37''
position (J1900) RA: 20h 54min 4,6sec DEC: +3 54' 36''
proper motion (J2000) RA: -0,109 arcsec/a DEC: -0,148 arcsec/a
radial velocity 18 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible
rotational velocity 54 km/s (uncertain) (variable)
trigonometric parallax 0,021 arcsec
note (category: dynamical parallaxes): 0.020".

magnitude

visual magnitude 5,23
(V on UBV Johnson system)

spectral / color information

spectral class F6IV
B-V-magnitude 0,46
U-B-magnitude 0,02
R-I-magnitude 0,28

double/multiple star system information

number of components of multiple star system 4
separation 1 arcsec
mag difference (of double or brightest multiple) 0,3
component ID AB
note (category: double and multiple data): AB 6.0 F5IV, 6.3 F7IV, 101.485y, a = 0.647". Combined mag., colors. Component C, 7.2v G0V at 11", CPM.
note (category: spectroscopic binaries): 2.0313d, K 15.8k/s, V0 +7.8k/s, asini 0.435.

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

position, motion, parallax:

position (J2000) RA: 20h 59min 4,468sec DEC: +4 17' 36,63'' 0,2 arcsec source: 52
proper motion (J2000) RA: -0,0071 arcsec/a DEC: -0,149 arcsec/a source: 25
radial velocity 18 km/s source: 25
trigonometric parallax 0,021 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 52,88 latitude: -25,78
GCI unit vector (J2000) X: 0,702269 Y: -0,707964 Z: 0,074866

magnitude:

visual 5,31 (observed) source: 25
photovisual 5,3 source: 2
photographic 5,8 source: 16

spectral information:

spectral class F5 source: 96
Morgan-Keenan F6IV source: 25
B-magnitude 5,77 0,05 B-V-magnitude 0,46
U-magnitude 5,78 0,05 U-B-magnitude 0,01

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 0,5

component magnitude spectral class catalogue(s)/name(s)
A 5,31 F5 e Equulei, 1 Equ, HR 8034, HD 199766, SAO 126428
B 7,35 F5

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
52 PPMN-HP subset
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H)
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: 20h 56min 34,503sec DEC: +4 6' 2,5'' 0,016 arcsec
position (J2000) RA: 20h 59min 4,417sec DEC: +4 17' 37,03''
proper motion J1950 (FK4) RA: -0,0075 arcsec/a DEC: -0,144 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0073 arcsec/a DEC: -0,148 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 F5
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: 29276
Durchmusterung BD+03 4473AB
Boss General Catalogue 29276
Henry Draper Catalogue 199766

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

position and proper motion:

position (J2000) RA: 20h 59,1min DEC: +4 18'
proper motion (J2000) RA: -0,1 arcsec/a DEC: -0,154 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 often '' 5,8 6,3 F6IV STF2737
AB-C 1833 often 78 10,8'' 5,42 7,35 - STF2737
1991 68 10,6''
AD 1912 2 279 77,1'' 5,3 12,4 - STF2737
1924 280 74,8''
BC 1893 5 78 10,7'' - - - STF2737
1982 69 11,2''

discoverer information:

discoverer code discoverer reference
STF2737 Struve, F.G.W. -

notes:

note Epsilon Equ. P = 101yr., a = 0.66", motion retrograde in a highly-inclined orbit. Proper motion of C -135 -153. One component is a spectroscopic binary, and C is physical, so that the system is quadruple.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (J1900) RA: 20h 54,1min DEC: +3 55'

magnitudes, spectral classes, orbital elements:

author: W.H. van den Bos
date of observation: 1932
magnitude of component A: 5,8
magnitude of component B: 5,8
spectral class component B: F6IV
spectral class component B: F6IV
period [y]: 101,4
semi-major axis [arcsec]: 0,656
inclination [deg]: 92,8
node [deg]: 105,2
equinox of node: 1900
eccentricity: 0,702
time of periastron passage: 1920,21
dates of ephemeris: 1932-1965
grade: good
reference: Union Obs. Circ. 3, 388; 1933.
notes Quadruple system. Star A is a single-lined spectroscopic binary, P = 2.03 d. Star C (mag. 7.3, dF4) is in slow retrograde motion at 10".