Mesarthim


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. Combined General Catalogue of Variable Stars (Vol. I-III)


catalogues and names Mesarthim, g2Ari, gam Ari, 5 Ari, HR 546, HD 11502, SAO 92681, WDS 01535+1918A
other names Mesartim, First Star in Aries
constellation Aries

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

note (category: star names): Mesarthim; Mesartim; "First Star in Aries".

position, motion, parallax:

position (J2000) RA: 1h 53min 31,8sec DEC: +19 17' 37''
position (J1900) RA: 1h 48min 2,4sec DEC: +18 48' 13''
proper motion (J2000) RA: 0,079 arcsec/a DEC: -0,104 arcsec/a
radial velocity -1 km/s
note: variable radial velocity
rotational velocity 63 km/s (uncertain) (variable)
trigonometric parallax 0,026 arcsec
note (category: dynamical parallaxes): 0.019".

magnitude

visual magnitude 4,75
(original HR magnitude)

spectral / color information

spectral class A1pSi
B-V-magnitude -0,04
U-B-magnitude -0,13
R-I-magnitude -0,05
note (category: spectra): Also classified A0pCr, A1pCrSiSr.

variability information

variable star identification Gam Ari
note (category: variability): Alpha CV 3.88 - 3.90V, 2.6095 or 1.7982d; also possibly 2.5 hrs., amp. 0.02, unconfirmed. Southern component of ADS 1507. Magnetic var.

double/multiple star system information

number of components of multiple star system 3
separation 7,8 arcsec
mag difference (of double or brightest multiple) 0,1
component ID AB
note (category: double and multiple data): Binary with HR 545, orbital period 5000 - 10000y? Component C, 9.6v at 221". Combined colors for HR 545-6; combined mag. 3.88V.

miscellaneous information

note (category: group membership): Pleiades group.

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

position, motion, parallax:

position (J2000) RA: 1h 53min 31,825sec DEC: +19 17' 37,21'' 1,24 arcsec source: 29
proper motion (J2000) RA: 0,0056 arcsec/a DEC: -0,104 arcsec/a source: 25
radial velocity -1 km/s source: 25
trigonometric parallax 0,026 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 142,56 latitude: -41,2
GCI unit vector (J2000) X: 0,830382 Y: 0,44866 Z: 0,33041

magnitude:

visual 4,75 (observed) source: 51
photovisual 4,8 source: 2
photographic 4,8 source: 2

spectral information:

Morgan-Keenan A1pSi source: 25
B-magnitude 4,71 0,05 B-V-magnitude -0,04
U-magnitude 4,58 0,05 U-B-magnitude -0,13

variability information:

source of data: 27
variability type 160
var. amplitude 0
var. period 2,61
var. epoch 2440998,99
16. February 1971, 11:45:36 UT
next max light 2451616,47
12. March 2000, 23:16:48 UT

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 7,5 arcsec
magnitude difference between brightest and second brightest component 0
position angle 0

component magnitude spectral class catalogue(s)/name(s)
A 4,75 - Mesarthim, g2Arietis, 5 Ari, HR 546, HD 11502, SAO 92681
B 4,83 A0 g1Arietis, 5 Ari, HR 545, HD 11503, SAO 92680

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
27 Catalog of Red Magnitudes (CRM)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
29 SAOJ2000
SAO on FK5 at J2000, 1989
51 Harvard photometry
"H" coded (Harvard photometry) magnitudes from the BSC5.

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

position and proper motion:

position (J1950) RA: 1h 50min 46,872sec DEC: +19 2' 57,87'' 0,014 arcsec
position (J2000) RA: 1h 53min 31,825sec DEC: +19 17' 37,21''
proper motion J1950 (FK4) RA: 0,0056 arcsec/a DEC: -0,1 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0056 arcsec/a DEC: -0,104 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,8 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class A0p
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: 2291
Durchmusterung BD+18 243A
Boss General Catalogue 2291
Henry Draper Catalogue 11503

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

position and proper motion:

position (J2000) RA: 1h 53,5min DEC: +19 18'
proper motion (J2000) RA: 0,081 arcsec/a DEC: -0,108 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 1821 often 358 8,6'' 4,8 4,8 A1pSi B9V STF 180
1988 0 7,5''
AC 1823 8 85 228,8'' 4,8 9,6 - STF 180
1924 84 221,3''

discoverer information:

discoverer code discoverer reference
STF 180 Struve, F.G.W. -

notes:

note Gamma Ari. A is a variable of the Alpha CVn type. Proper motion of B +077 -115.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (J1950) RA: 1h 50min 46,9sec DEC: +19 2' 58''

variability informations:

variability type ACV rotating variable star
magnitute at max. brightness 4,62
magnitute amplitude 0,04
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2440998,99
16. February 1971, 11:45:36 UT
period [d] 2,6095
next maximum light [JD] 2451617,0455
13. March 2000, 13:05:31 UT
rising time 50 % of period

spectral information

spectral class A1p(Cr-Si-Sr)

references

to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue 7/9003
constellation Aries
notes on existence The star is equivalent to '0080001 R'.
There are notes in published catalog.

variability type description

variability type description
ACV Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields.
Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V.

ACVO
Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.