z Sagitta


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 z Sge, 8 Sge, HR 7546, HD 187362, SAO 105298, WDS 19490+1909A
constellation Sagitta

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


position, motion, parallax:

position (J2000) RA: 19h 48min 58,7sec DEC: +19 8' 32''
position (J1900) RA: 19h 44min 32,3sec DEC: +18 53' 28''
proper motion (J2000) RA: 0,021 arcsec/a DEC: 0,03 arcsec/a
radial velocity -14 km/s
note: variable radial velocity
rotational velocity 225 km/s (uncertain) (variable)
trigonometric parallax 0,01 arcsec
note (category: radial and/or rotational velocities): ADS 12973A, suspected SB.
note (category: dynamical parallaxes): 0.010".

magnitude

visual magnitude 5
(V on UBV Johnson system)

spectral / color information

spectral class A3V
B-V-magnitude 0,1
U-B-magnitude 0,05
R-I-magnitude 0,06

double/multiple star system information

number of components of multiple star system 4
separation 0,2 arcsec
mag difference (of double or brightest multiple) 0,5
component ID AB
note (category: double and multiple data): AB 5.5 A1V, 6.2 A3V, 22.8y, a = 0.146". Masses 4.0, 2.0 solar. C, 8.7v at 8" physical. Speckle interferometry 1985.5 gives sep. 0.180".

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

position, motion, parallax:

position (J2000) RA: 19h 48min 58,658sec DEC: +19 8' 31,24'' 0,35 arcsec source: 17
proper motion (J2000) RA: 0,0013 arcsec/a DEC: 0,025 arcsec/a source: 25
radial velocity -14 km/s source: 25
trigonometric parallax 0,01 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 56,49 latitude: -3,4
GCI unit vector (J2000) X: 0,432475 Y: -0,839905 Z: 0,327911

magnitude:

visual 5 (observed) source: 25
photovisual 5 source: 2
photographic 5 source: 16

spectral information:

spectral class A2 source: 96
Morgan-Keenan A3V source: 25
B-magnitude 5,1 0,05 B-V-magnitude 0,1
U-magnitude 5,15 0,05 U-B-magnitude 0,05

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 1

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
17 ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991
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: 19h 46min 45,415sec DEC: +19 0' 55,54'' 0,014 arcsec
position (J2000) RA: 19h 48min 58,674sec DEC: +19 8' 31,52''
proper motion J1950 (FK4) RA: 0,0014 arcsec/a DEC: 0,031 arcsec/a 0,003 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0015 arcsec/a DEC: 0,03 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 5 (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: 27431
Durchmusterung BD+18 4254
Boss General Catalogue 27431
Henry Draper Catalogue 187362

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

position and proper motion:

position (J2000) RA: 19h 49min DEC: +19 9'
proper motion (J2000) RA: 0,018 arcsec/a DEC: 0,025 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 1878 often '' 5,4 6,4 A1V AGC 11
AB-C 1822 84 311 8,6'' 5,04 9,03 - STF2585
1987 - 8,4''
AB-D 1921 3 248 74,7'' 5,04 11 - STF2585
1971 247 76''

discoverer information:

discoverer code discoverer reference
AGC 11 - -
STF2585 Struve, F.G.W. -

notes:

note Zeta Sge. P = 23.22yr., a = 0.136", motion retrograde. A is a suspected spectroscopic binary. AB-C: C is physical.