z2Aquarii


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 z2Aqr, NSV 25909, 55 Aqr, HR 8559, HD 213052, SAO 146108, WDS 22288-0001A
constellation Aquarius

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


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

position, motion, parallax:

position (J2000) RA: 22h 28min 50,1sec DEC: -0 1' 12''
position (J1900) RA: 22h 23min 41sec DEC: -0 31' 56''
proper motion (J2000) RA: 0,209 arcsec/a DEC: 0,042 arcsec/a
radial velocity 25 km/s
rotational velocity 58 km/s (uncertain) (variable)
trigonometric parallax 0,022 arcsec
note (category: dynamical parallaxes): 0.039".

magnitude

visual magnitude 4,42
(original HR magnitude)

spectral / color information

spectral class F3V
B-V-magnitude 0,38
U-B-magnitude -0,01
R-I-magnitude 0,23

double/multiple star system information

number of components of multiple star system 3
separation 1,8 arcsec
mag difference (of double or brightest multiple) 0,2
note (category: double and multiple data): Binary with HR 8558. AB 4.31 F2IV, 4.51 F3IV, 856.0y, a = 5.055". Magnitude for blend 3.65V, combined colors. Component B, HR 8558, is an astrometric binary.

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

position, motion, parallax:

position (J2000) RA: 22h 28min 49,89sec DEC: -0 1' 12,72'' 0,43 arcsec source: 16
proper motion (J2000) RA: 0,0131 arcsec/a DEC: 0,031 arcsec/a source: 25
radial velocity 25 km/s source: 25
trigonometric parallax 0,022 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 65,36 latitude: -46,33
GCI unit vector (J2000) X: 0,921916 Y: -0,387389 Z: -0,000353

magnitude:

visual 4,29 (observed) source: 25
photovisual 4,4 source: 2
photographic 4,8 source: 2

spectral information:

spectral class F2 source: 29
Morgan-Keenan F3V source: 25
B-magnitude 4,66 0,05 B-V-magnitude 0,37
U-magnitude 4,66 0,05 U-B-magnitude 0

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 2 arcsec
magnitude difference between brightest and second brightest component 0,2
position angle 198

component magnitude spectral class catalogue(s)/name(s)
A 4,29 F2 z2Aquarii, 55 Aqr, HR 8559, HD 213052, SAO 146108
B 4,52 F2 z1Aquarii, 55 Aqr, HR 8558, HD 213051, SAO 146107

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
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 26min 15,514sec DEC: -0 16' 36,08'' 0,013 arcsec
position (J2000) RA: 22h 28min 50,053sec DEC: -0 1' 12,18''
proper motion J1950 (FK4) RA: 0,0138 arcsec/a DEC: 0,047 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,014 arcsec/a DEC: 0,042 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 F2
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: 31399
Durchmusterung BD-00 4365A
Boss General Catalogue 31399
Henry Draper Catalogue 213052

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

position and proper motion:

position (J2000) RA: 22h 28,8min DEC: -0 1'
proper motion (J2000) RA: 0,18 arcsec/a DEC: 0,039 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
- 1821 often 358 3,8'' 4,3 4,5 F3IV-V STF2909
1994 198 2''

discoverer information:

discoverer code discoverer reference
STF2909 Struve, F.G.W. -

notes:

note P = 760yr., a = 4.51", motion retrograde. A companion which may have been resolved accompanies one of the stars, P = 25.7yr. Proper motion of B +176 +013.

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

position:

position (J1900) RA: 22h 23,7min DEC: -0 32'

magnitudes, spectral classes, orbital elements:

author: R.S. Harrington R.S. Harrington
date of observation: 1967 1967
magnitude of component A: 4,31 4,51
magnitude of component B: 4,31 4,51
spectral class component B: F3V
spectral class component B: F3V
period [y]: 856 25,5
semi-major axis [arcsec]: 5,055 0,072
inclination [deg]: 131,25 55,62
node [deg]: 310,22 (ascending) 19,61
equinox of node: 2000 2000
eccentricity: 0,495 0,26
time of periastron passage: 1957,6 1954,5
dates of ephemeris: 1968-1977
grade: preliminary
reference: Astron. J. 73, 508; 1968. Ibid.
notes The unseen star is associated with the visual secondary. Suspected variability of one of the components is unconfirmed.