i Leonis

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

  6. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names i Leo, NSV 05184, 78 Leo, HR 4399, HD 99028, SAO 99587, WDS 11239+1032
constellation Leo

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: 11h 23min 55,5sec DEC: +10° 31' 45''
position (J1900) RA: 11h 18min 42,7sec DEC: +11° 4' 49''
proper motion (J2000) RA: 0,168 arcsec/a DEC: -0,075 arcsec/a
radial velocity -10 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible
rotational velocity 20 km/s (uncertain) (variable)
trigonometric parallax 0,052 arcsec
note (category: dynamical parallaxes): 0.052".

magnitude

visual magnitude 3,94
(V on UBV Johnson system)

spectral / color information

spectral class F4IV
B-V-magnitude 0,41
U-B-magnitude 0,07
R-I-magnitude 0,21

variability information

variable star identification 5184
note (category: variability): Delta Sct?

double/multiple star system information

separation 1,1 arcsec
mag difference (of double or brightest multiple) 2,8
note (category: double and multiple data): 4.03 F2IV, 6.70 G3V, 192.0y, a = 1.92"; possible subsystem with period about 16y. Combined mag., colors. Combined mass about 3 Suns.
note (category: spectroscopic binaries): 192y, K 2.5k/s, V0 -11.0k/s, asini 2030. Orbit questioned by Morbey and Griffin (1987, ApJ, 317, 343).

miscellaneous information

note (category: group membership): UMa stream.

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

position, motion, parallax:

position (J2000) RA: 11h 23min 55,514sec DEC: +10° 31' 45,23'' ±0,19 arcsec source: 33
proper motion (J2000) RA: 0,0113 arcsec/a DEC: -0,075 arcsec/a source: 25
radial velocity -10 km/s source: 25
trigonometric parallax 0,052 ±0,005 arcsec source: 25
galactic coord. (B1950) longitude: 247,62° latitude: 63,55°
GCI unit vector (J2000) X: -0,971007 Y: 0,154117 Z: 0,182737

magnitude:

visual 3,94 (observed) source: 25
photovisual 4 source: 2
photographic 4,5 source: 2

spectral information:

spectral class F5 source: 96
Morgan-Keenan F4IV source: 25
B-magnitude 4,35 ±0,05 B-V-magnitude 0,41
U-magnitude 4,42 ±0,05 U-B-magnitude 0,07

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 1,5 arcsec
magnitude difference between brightest and second brightest component 2,6
position angle 125 °

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: 11h 21min 19,13sec DEC: +10° 48' 17,56'' ±0,008 arcsec
position (J2000) RA: 11h 23min 55,494sec DEC: +10° 31' 44,92''
proper motion J1950 (FK4) RA: 0,0113 arcsec/a DEC: -0,079 arcsec/a ±0,002 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0114 arcsec/a DEC: -0,075 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class F5
source of spectral data Taken from the HD with M stars reclassified by Miss Cannon.

catalogues

source catalogue FK3, catalogue number: 430
Durchmusterung BD+11 2348
Boss General Catalogue 15652
Henry Draper Catalogue 99028

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

position and proper motion:

position (J2000) RA: 11h 23,9min DEC: +10° 32'
proper motion (J2000) RA: 0,166 arcsec/a DEC: -0,079 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 1828 often 95° 2,1'' 4,1 6,7 F4IV STF1536
1990 125° 1,5''
AB-C 1978 1 345° 332'' 4,1 10,7 - STF1536

discoverer information:

discoverer code discoverer reference
STF1536 Struve, F.G.W. -

notes:

note Iota Leo. P = 183yr., a = 1.93", motion retrograde. Mt. Wilson spectral types F3s and F3s. A is a Delta Scuti-type variable.

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

position:

position (J1900) RA: 11h 18,7min DEC: +11° 5'

magnitudes, spectral classes, orbital elements:

author: P. Baize
magnitude of component A: 4,03
magnitude of component B: 4,03
spectral class component B: F4IV
spectral class component B: F4IV
period [y]: 192
semi-major axis [arcsec]: 1,92
inclination [deg]: 130,5
node [deg]: 52,2
eccentricity: 0,55
time of periastron passage: 1948,47
grade: reliable
reference: Astron. Astrophys. Suppl. 39, 83; 1980.
notes Star A is a Delta Scuti type variable. A small variation in the early RV's was not confirmed by fairly numerous subsequent observations. From the visual separations, Baize suggests a subsystem with P = 16 yr.