z2Cancri


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 z2Cnc, 16 Cnc, HR 3210, HD 68255, SAO 97646, WDS 08122+1739B
constellation Cancer

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


position, motion, parallax:

position (J2000) RA: 8h 12min 13,3sec DEC: +17 38' 52''
position (J1900) RA: 8h 6min 29sec DEC: +17 56' 55''
proper motion (J2000) RA: 0,097 arcsec/a DEC: -0,109 arcsec/a
radial velocity -11 km/s
note: variable radial velocity
trigonometric parallax 0,039 arcsec
note (category: dynamical parallaxes): 0.031".

magnitude

visual magnitude 6,2
(V on UBV Johnson system)

spectral / color information

spectral class G5V
B-V-magnitude 0,6
U-B-magnitude 0,13

double/multiple star system information

number of components of multiple star system 5
separation 5,9 arcsec
mag difference (of double or brightest multiple) 1,2
component ID ABxC
note (category: double and multiple data): See HR 3208. C* 6.20 G5V, 17.5y, a = 0.191". Astrometric companion also found by occultation, 9.0v. Cc resolved by speckle interferometry.

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

position, motion, parallax:

position (J2000) RA: 8h 12min 12,778sec DEC: +17 38' 51,5'' 0,35 arcsec source: 17
proper motion (J2000) RA: 0,0056 arcsec/a DEC: -0,142 arcsec/a source: 25
radial velocity -6 km/s source: 25
trigonometric parallax 0,039 0,004 arcsec source: 25
galactic coord. (B1950) longitude: 205,31 latitude: 25,53
GCI unit vector (J2000) X: -0,51975 Y: 0,798719 Z: 0,303162

magnitude:

visual 6,02 (observed) source: 25
photovisual 6,3 source: 2
photographic 6,8 source: 2

spectral information:

Morgan-Keenan F9V source: 25
B-magnitude 6,56 0,05 B-V-magnitude 0,54
U-magnitude 6,62 0,05 U-B-magnitude 0,06

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 0,4

component magnitude spectral class catalogue(s)/name(s)
A 5,63 G0 Tegmine, z1Cancri, 16 Cnc, HR 3208, HD 68257, SAO 97645
B 6,02 - z1Cancri, 16 Cnc, HR 3209, HD 68256, SAO 97645
C 6,2 - z2Cancri, 16 Cnc, HR 3210, HD 68255, SAO 97646

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
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

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 8h 9min 21,213sec DEC: +17 47' 58,38'' 0,032 arcsec
position (J2000) RA: 8h 12min 13,263sec DEC: +17 38' 51,63''
proper motion J1950 (FK4) RA: 0,0069 arcsec/a DEC: -0,112 arcsec/a 0,005 arcsec/a in RA
0,004 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0068 arcsec/a DEC: -0,108 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 6 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class G0
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: 11142
Durchmusterung BD+18 1867C
Boss General Catalogue 11142
Henry Draper Catalogue 68255

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

position and proper motion:

position (J2000) RA: 8h 12,2min DEC: +17 39'
proper motion (J2000) RA: 0,081 arcsec/a DEC: -0,142 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 1826 often '' 5,6 6 F8V STF1196
AB-C 1821 often 160 5,3'' 5,05 6,2 G0V STF1196
1987 82 5,7''
AB-D 1887 5 108 293,4'' - 9,7 - STF1196
1984 - 283,2''
AC 1821 often 160 5,7'' 5,6 6,3 - STF1196
1992 80 5,3''
AB-E 1887 1 27 9,1'' - - - ENH 1
AB-F 1887 1 47 10,5'' - - - ENH 1
AB-G 1887 1 331 10,7'' - - - ENH 1
BC 1840 often 155 5,6'' 6 6,3 - STF1196
1965 79 -
CD 1913 3 108 283,6'' 6,3 10,5 - STF1196
1922 - 281''

discoverer information:

discoverer code discoverer reference
STF1196 Struve, F.G.W. -
ENH 1 Engelhardt, von (Astron. Nachr. 117, 1; 1887.)

notes:

note Zeta Cnc. P = 59.7yr., a = 0.88", motion retrograde. AB-C: A premature orbit has been computed. An unseen companion of C with P = 17.2yr. is known. AB-D: D is BD+18@1870.

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

position:

position (J1900) RA: 8h 6,5min DEC: +17 57'

magnitudes, spectral classes, orbital elements:

author: C. Gasteyer C. Gasteyer C. Gasteyer
date of observation: 1951 1953 1953
magnitude of component A: 5,63 5,05 6,2
magnitude of component B: 5,63 5,05 6,2
spectral class component B: F8V G0V
spectral class component B: F8V G0V
period [y]: 59,7 1150 17,5
semi-major axis [arcsec]: 0,884 7,96 0,191
inclination [deg]: 172 144,6 144
node [deg]: 58 256,7 (ascending) 251 (ascending)
equinox of node: 1900 1900 1900
eccentricity: 0,32 0,26 0,11
time of periastron passage: 1930 1960 1944,4
dates of ephemeris: 1950-1972 1950-1972
grade: definitive indeterminate
reference: Astron. J. 59, 243; 1954. Ibid. Ibid.
other name(s) STF 1196 Cc-P