20210-1447 BLA   7Aa,Ab

 
 
20h 21m 00.67s -14 46' 53.0" P.A. 213.50 sep 0.1 mag 3.10,4.90 Sp F8V+A0 dist. 100.2 pc (326.85 l.y.)
 
 
Coord 2000
20210-1447
Discov num
BLA   7
Comp
Aa,Ab
Coord arcsec 2000
20 21 00.67 -14 46 53.0
Date first
1976
Date last
2019
Obs
12
Pa first
49
Pa last
234
P.A. Now (θ)
213.5°
Sep first
0.0
Sep last
0.0
Sep. Now (ρ)
0.07"
Mag pri
3.10
Mag sec
4.90
delta mag (ΔM)
1.8
Spectral class
F8V+A0 (yellow-white/white)
Pri motion ra
+042
Sec motion ra
Pri motion dec
+002
Sec motion dec
Notes
N O (See Notes, Orbital solution)
Visually invisible, K-band or other infrared star This double is physical.
 
 
20210-1447 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 163481 20210-1447 BLA 7 Aa,Ab 1976 2019 12 214 0.1 3.10 4.90 1.80 Y <===
Show Dabih 163481 20210-1447 STFA 52 AB 1800 2012 41 267 205.4 3.15 6.08 2.93
Show 163481 20210-1447 STFA 52 AC 1905 2012 11 133 226.1 3.15 8.83 5.68
Show 163481 20210-1447 HJ 2948 AD 1891 2000 3 292 115.9 3.15 12.96 9.81
Show 163471 20210-1447 BAR 12 Ba,Bb 1884 2019 26 54 0.5 6.16 9.14 2.98 Y
Show 163471 20210-1447 STFA 52 BC 1895 2015 14 111 396.5 6.08 8.83 2.75
Show 163471 20210-1447 HJ 2948 DE 1823 2000 8 321 3.9 13.70 14.40 0.70
Septuple system
5 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
234.3
Precise sep
0.033
Constellation
Capricornus
SAO
163481
HIP
100345
Tycho2
5753-02281-1
Gaia DR2
75998568192
HD
193495
HR
7776
GC
28295
ADS
13717
BD
BD-15 5629
Bayer
Beta Capricorni
Bayer name
Bet Cap
Flamsteed
9 Capricorni
Flamsteed name
9 Cap
Distance
100.2
Distance ly
326.85
last precise pa
234.3
last precise sep
0.033
 
 
ORBITAL ELEMENTS
 
 
Period (P)3.765y Periastron (T)2015.704y± 0.035 Semi-major axis (a)0.0665a± 0.0023
Eccentricity (e)0.043 Inclination (i)80.9°± 3.2 Longitude of periastron (ω)120°
Node (Ω)34.3°± 2.1 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2014
label rho theta
2000 0.039 46.6
2001 0.059 210.4
2002 0.022 242.1
2003 0.065 31.3
2004 0.017 70.1
2005 0.065 214.4
2006 0.012 329.9
2007 0.068 34.8
2008 0.016 177.4
2009 0.061 218.3
2010 0.031 15.6
2011 0.060 38.6
2012 0.039 202.2
2013 0.047 223.7
2014 0.050 25.5
2015 0.044 44.3
2016 0.056 209.2
2017 0.028 235.6
2018 0.063 30.4
2019 0.023 59.7
2020 0.065 213.5
2021 0.011 298.0
2022 0.068 33.9
2023 0.012 156.3
2024 0.063 217.2
2025 0.026 10.5
2026 0.063 37.5
2027 0.033 199.0
2028 0.051 222.0
2029 0.046 23.8
2030 0.049 42.5

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






wds20210-1447a.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
20210-1447 BLA 7 Aa,Ab 1992 7 48 0.0 3.10 4.90 F8V+A0 NOD 202100.65-144653.0
20210-1447 BLA 7 Aa,Ab 2014 8 42 0.0 3.10 4.90 F8V+A0 NO 202100.67-144653.0
20210-1447 BLA 7 Aa,Ab 2017 10 34 0.0 3.10 4.90 F8V+A0 NO 202100.67-144653.0
20210-1447 BLA 7 Aa,Ab 2018 11 40 0.1 3.10 4.90 F8V+A0 NO 202100.67-144653.0
20210-1447 BLA 7 Aa,Ab 2019 12 234 0.0 3.10 4.90 F8V+A0 NO 202100.67-144653.0

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