00491+5749 STF  60AB (Achird)

 
 
00H 49M 06.29S +57 48' 54.7" P.A. 325 SEP 13.32 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
2016
Obs
1069
Pa first
62
Pa last
324
P.A. Now (θ)
325°
Sep first
11.3
Sep last
12.9
Sep. Now (ρ)
13.32"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Achird 21732 00491+5749 STF 60 AB 1779 2016 1069 325 13.3 3.52 7.36 3.84 Y <===
Show 21732 00491+5749 STF 60 AC 1912 2000 4 260 225.0 3.52 11.40 7.88
Show 21732 00491+5749 STF 60 AD 1912 2011 7 354 189.4 3.52 12.80 9.28
Show 21732 00491+5749 STF 60 AE 1856 2015 24 126 75.6 3.52 10.15 6.63
Show 21732 00491+5749 STF 60 AF 1913 2000 3 276 378.3 3.52 11.53 8.01
Show 21732 00491+5749 STF 60 AG 1852 2012 18 258 426.0 3.52 9.53 6.01
Show 21732 00491+5749 STF 60 AH 1991 2000 3 355 694.7 3.52 8.41 4.89
Show 21732 00491+5749 SMR 2 AI 2000 2012 7 73 90.3 3.52 11.60 8.08
Show 21732 00491+5749 SMR 2 AJ 2000 2012 5 262 237.1 3.52 12.30 8.78
Show 21732 00491+5749 STF 60 BC 1912 2000 4 257 218.7 7.36 11.40 4.04
Show 21732 00491+5749 STF 60 BD 2000 2000 1 1 172.2 7.36 12.80 5.44
Show 21732 00491+5749 STF 60 BE 1913 2000 3 125 106.1 7.36 10.15 2.79
Show 21732 00491+5749 STF 60 BF 1991 2000 2 275 369.1 7.36 11.53 4.17
Show 21732 00491+5749 STF 60 BG 1991 2000 2 254 404.0 7.36 9.53 2.17
Show 21732 00491+5749 STF 60 BH 1928 2000 4 355 684.7 7.36 8.41 1.05
Show 00491+5749 STF 60 FG 1911 2003 6 188 142.4 11.53 9.53 2.00
Decuple system
10 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name
Achird
Other names
MARFAK
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
last precise pa
324.2
last precise sep
12.9
 
 
ORBITAL ELEMENTS
 
 
Period (P)479.27y± 8.2 Periastron (T)1889.93y± 0.18 Semi-major axis (a)12.04a± 0.02
Eccentricity (e)0.497± 0.006 Inclination (i)35.6°± 0.3 Longitude of periastron (ω)269.8°± 1
Node (Ω)278°± 0.6 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2014
label rho theta
2000 12.783 317.4
2001 12.819 317.8
2002 12.854 318.3
2003 12.888 318.8
2004 12.922 319.2
2005 12.956 319.7
2006 12.989 320.1
2007 13.022 320.6
2008 13.054 321.1
2009 13.085 321.5
2010 13.117 321.9
2011 13.147 322.4
2012 13.178 322.8
2013 13.208 323.3
2014 13.237 323.7
2015 13.266 324.2
2016 13.295 324.6
2017 13.323 325.0
2018 13.350 325.5
2019 13.378 325.9
2020 13.405 326.3
2021 13.431 326.7
2022 13.457 327.2
2023 13.483 327.6
2024 13.509 328.0
2025 13.534 328.4
2026 13.558 328.9
2027 13.582 329.3
2028 13.606 329.7
2029 13.630 330.1
2030 13.653 330.5

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic