21008-0821 BU 678 AB (HD 199976)

 
 
21h 00m 49.02s -08° 20' 34.3" P.A. 260.00 sep 2.8 mag 8.20,11.26 Sp G0 dist. 34.38 pc (112.15 l.y.)
 
 
Coord 2000 21008-0821 Discov num BU  678 Comp AB Coord arcsec 2000 21 00 49.02 -08 20 34.3
Date first 1877 Date last 2016 Obs 27
Pa first 182 Pa last 260.2 P.A. Now (θ) 260.2°
Sep first 2.2 Sep last 2.847 Sep. Now (ρ) 2.847"
Mag pri 8.20 Mag sec 11.26 delta mag (ΔM) 3.06 Spectral class G0 (yellow)
Pri motion ra +243 Sec motion ra +239
Pri motion dec +030 Sec motion dec +027
Notes O (Orbital solution)
rPM=0.02 (< 0.3, Physical double)
This double is physical.
 
 
21008-0821 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 199976 145026 21 00 49 -08 20 34 BU 678 AB 2016 27 260 2.8 8.20 11.26 3.06 Y <===
Show 145026 21 00 49 -08 20 34 FOX 255 AC 2000 3 251 71.0 8.20 13.50 5.30
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 199976 Constellation Aquarius SAO 145026 HIP 103699
Tycho2 5770-00692-1 Gaia DR2 6908757299969652480 HD 199976 ADS 14528
BD BD-08 5544 Distance 34.38 Distance ly 112.15
 
 
ORBITAL ELEMENTS
 
 
Period (P)837.9275y± 406.6674 Periastron (T)1850.9234y± 10.5379 Semi-major axis (a)9.37004a± 6.26094
Eccentricity (e)0.90786± 0.08214 Inclination (i)77.618°± 8.232 Longitude of periastron (ω)285.592°± 10.83
Node (Ω)168.607°± 4.294 Notes ReferenceIzm2019
Equinox Last observation2014 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 253.0 2.711
2001 253.5 2.718
2002 253.9 2.726
2003 254.4 2.734
2004 254.8 2.742
2005 255.3 2.750
2006 255.7 2.758
2007 256.2 2.766
2008 256.6 2.774
2009 257.0 2.782
2010 257.5 2.791
2011 257.9 2.799
2012 258.3 2.808
2013 258.8 2.817
2014 259.2 2.826
2015 259.6 2.835
2016 260.0 2.844
2017 260.5 2.853
2018 260.9 2.862
2019 261.3 2.871
2020 261.7 2.881
2021 262.1 2.890
2022 262.5 2.900
2023 262.9 2.910
2024 263.3 2.919
2025 263.7 2.929
2026 264.1 2.939
2027 264.5 2.949
2028 264.9 2.959
2029 265.3 2.970
2030 265.7 2.980


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



 
 


wds21008-0821b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic