00491+5749 STF 60 AB (Achird)

 
 
00h 49m 06.29s +57 48' 54.7" P.A. 327.00 sep 13.4 mag 3.52,7.36 Sp G1V+M dist. 5.95 pc (19.41 l.y.)
 
 
Coord 2000 00491+5749 Discov num STF  60 Comp AB Coord arcsec 2000 00 49 06.29 +57 48 54.7
Date first 1779 Date last 2022 Obs 1086
Pa first 62 Pa last 327.2 P.A. Now (θ) 327.6°
Sep first 11.3 Sep last 13.41 Sep. Now (ρ) 13.483"
Mag pri 3.52 Mag sec 7.36 delta mag (ΔM) 3.84 Spectral class G1V+M (yellow/red)
Pri motion ra +114 Sec motion ra +111
Pri motion dec -057 Sec motion dec -049
Notes N O P (See Notes, Orbital solution, 100-year proper motion)
rPM=0.067 (< 0.3, Physical double)
This double is physical.
 
 
00491+5749 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Achird 21732 00 49 06 +57 48 55 STF 60 AB 2022 1086 327 13.4 3.52 7.36 3.84 Y <===
Show 21732 00 49 06 +57 48 55 STF 60 AC 2000 4 260 225.0 3.52 11.40 7.88
Show 21732 00 49 06 +57 48 55 STF 60 AD 2011 7 354 189.4 3.52 12.80 9.28
Show 21732 00 49 06 +57 48 55 STF 60 AE 2015 24 126 75.6 3.52 10.15 6.63
Show 21732 00 49 06 +57 48 55 STF 60 AF 2000 3 276 378.3 3.52 11.53 8.01
Show 21732 00 49 06 +57 48 55 STF 60 AG 2012 19 259 419.7 3.52 9.53 6.01
Show 21732 00 49 06 +57 48 55 STF 60 AH 2012 4 355 701.1 3.52 8.41 4.89
Show 21732 00 49 06 +57 48 55 SMR 2 AI 2012 7 73 90.3 3.52 11.60 8.08
Show 21732 00 49 06 +57 48 55 SMR 2 AJ 2012 5 262 237.1 3.52 12.30 8.78
Show 00 49 05 +57 49 04 STF 60 BC 2000 4 257 218.7 7.36 11.40 4.04
Show 00 49 05 +57 49 04 STF 60 BD 2000 1 1 172.2 7.36 12.80 5.44
Show 00 49 05 +57 49 04 STF 60 BE 2020 4 126 105.5 7.36 10.15 2.79
Show 00 49 05 +57 49 04 STF 60 BF 2000 2 275 369.1 7.36 11.53 4.17
Show 00 49 05 +57 49 04 STF 60 BG 2000 2 254 404.0 7.36 9.53 2.17
Show 00 49 05 +57 49 04 STF 60 BH 2020 5 355 688.4 7.36 8.41 1.05
Show 00 48 19 +57 49 34 STF 60 FG 2015 10 188 142.2 11.53 9.53 2.00
Decuple system
10 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name Achird Constellation Cassiopeia SAO 21732 HIP 3821
Tycho2 3663-02669-1 HD 4614 HR 219 GC 962
ADS 671 GL Gl 34A BD BD+57 150 Bayer Eta Cassiopeiae
Bayer name Eta Cas Flamsteed 24 Cassiopeiae Flamsteed name 24 Cas Distance 5.95
Distance ly 19.41 Bayer greek η Cas
Other names MARFAK
Meaning first applied to ? Cassiopeiae in the Skalnate Pleso Atlas of the Heavens published in 1950, but is not known prior to that.
 
 
ORBITAL ELEMENTS
 
 
Period (P)479.27y Periastron (T)1889.93y Semi-major axis (a)12.04a
Eccentricity (e)0.497 Inclination (i)35.6° Longitude of periastron (ω)269.8°
Node (Ω)278° Notesn ReferenceSca2015c
Equinox2000 Last observation2014 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 317.4 12.783
2001 317.8 12.819
2002 318.3 12.854
2003 318.8 12.888
2004 319.2 12.922
2005 319.7 12.956
2006 320.1 12.989
2007 320.6 13.022
2008 321.1 13.054
2009 321.5 13.085
2010 321.9 13.117
2011 322.4 13.147
2012 322.8 13.178
2013 323.3 13.208
2014 323.7 13.237
2015 324.2 13.266
2016 324.6 13.295
2017 325.0 13.323
2018 325.5 13.350
2019 325.9 13.378
2020 326.3 13.405
2021 326.7 13.431
2022 327.2 13.457
2023 327.6 13.483
2024 328.0 13.509
2025 328.4 13.534
2026 328.9 13.558
2027 329.3 13.582
2028 329.7 13.606
2029 330.1 13.630
2030 330.5 13.653


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.



 
 


wds00491%2B5749a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic