21137+6424 H 1  48

 
 
21h 13m 42.46s +64 24' 15.1" P.A. 244 sep 0.76 mag 7.21,7.33 Sp G2IV+G2IV dist. 42.75 pc (139.45 l.y.)
 
 
Coord 2000
21137+6424
Discov num
H 1  48
Comp
Coord arcsec 2000
21 13 42.46 +64 24 15.1
Date first
1859
Date last
2018
Obs
154
Pa first
246
Pa last
244
P.A. Now (θ)
244°
Sep first
0.9
Sep last
0.7
Sep. Now (ρ)
0.76"
Mag pri
7.21
Mag sec
7.33
delta mag (ΔM)
0.12
Spectral class
G2IV+G2IV (yellow/yellow)
Pri motion ra
+018
Sec motion ra
Pri motion dec
-096
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
244.4
Precise sep
0.713
Constellation
Cepheus
SAO
19257
HIP
104788
Tycho2
4256-01036-1
HD
202582
HR
8133
ADS
14783
BD
BD+63 1708
Distance
42.75
Distance ly
139.45
last precise pa
244.4
last precise sep
0.713
 
 
ORBITAL ELEMENTS
 
 
Period (P)82.18y Periastron (T)2003.01y Semi-major axis (a)0.609a
Eccentricity (e)0.744 Inclination (i)82.6° Longitude of periastron (ω)34.3°
Node (Ω)63.4° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2017
label rho theta
2000 0.157 53.0
2001 0.177 58.0
2002 0.173 62.4
2003 0.130 68.3
2004 0.049 89.5
2005 0.060 216.8
2006 0.149 232.2
2007 0.231 236.3
2008 0.304 238.2
2009 0.369 239.5
2010 0.427 240.4
2011 0.480 241.1
2012 0.527 241.6
2013 0.571 242.1
2014 0.610 242.5
2015 0.647 242.8
2016 0.680 243.2
2017 0.710 243.4
2018 0.737 243.7
2019 0.762 244.0
2020 0.785 244.2
2021 0.806 244.4
2022 0.825 244.6
2023 0.842 244.8
2024 0.857 245.0
2025 0.871 245.2
2026 0.883 245.4
2027 0.893 245.6
2028 0.902 245.7
2029 0.910 245.9
2030 0.916 246.1

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






wds21137%2B6424d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
21137+6424 H 1 48 2007 143 244 0.3 7.21 7.33 G2IV+G2IV NOD 211342.46+642415.1
21137+6424 H 1 48 2008 146 237 0.3 7.21 7.33 G2IV G2IV NOD 211342.46+642415.1
21137+6424 H 1 48 2012 147 243 0.5 7.21 7.33 G2IV G2IV NOD 211342.46+642415.1
21137+6424 H 1 48 2014 149 244 0.6 7.21 7.33 G2IV+G2IV NO 211342.46+642415.1
21137+6424 H 1 48 2016 152 246 0.7 7.21 7.33 G2IV+G2IV NO 211342.46+642415.1
21137+6424 H 1 48 2018 153 244 0.7 7.21 7.33 G2IV+G2IV NO 211342.46+642415.1

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