09100-2845 B 179 (HD 78921)

 
 
09h 09m 57.24s -28 45' 20.7" P.A. 113.00 sep 0.1 mag 9.44,9.64 Sp K0V dist. 55.9 pc (182.35 l.y.)
 
 
Coord 2000 09100-2845 Discov num B   179 Comp Coord arcsec 2000 09 09 57.24 -28 45 20.7
Date first 1927 Date last 2020 Obs 40
Pa first 161 Pa last 112.9 P.A. Now (θ) 69.2°
Sep first 0.4 Sep last 0.126 Sep. Now (ρ) 0.092"
Mag pri 9.44 Mag sec 9.64 delta mag (ΔM) 0.2 Spectral class K0V (yellow-orange)
Pri motion ra -013 Sec motion ra -013
Pri motion dec -077 Sec motion dec -077
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 78921 Constellation Pyxis SAO 177059 HIP 45003
Tycho2 6598-01373-1 Gaia DR2 5636015416217477504 HD 78921 ADS 7223
CD CD-28 6981 CP CP-28 3635 Distance 55.9 Distance ly 182.35
 
 
ORBITAL ELEMENTS
 
 
Period (P)80.35y± 0.84 Periastron (T)2026.88y± 0.62 Semi-major axis (a)0.372a± 0.006
Eccentricity (e)0.562± 0.025 Inclination (i)116.3°± 1.3 Longitude of periastron (ω)158.5°± 3
Node (Ω)169.4°± 1.1 Notes ReferenceTok2019c
Equinox Last observation2018 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 169.5 0.534
2001 168.7 0.526
2002 167.8 0.518
2003 167.0 0.508
2004 166.1 0.497
2005 165.1 0.485
2006 164.1 0.472
2007 163.1 0.458
2008 161.9 0.442
2009 160.7 0.425
2010 159.4 0.407
2011 158.0 0.388
2012 156.4 0.367
2013 154.6 0.344
2014 152.5 0.321
2015 150.1 0.295
2016 147.3 0.268
2017 143.7 0.240
2018 139.3 0.211
2019 133.3 0.181
2020 125.0 0.151
2021 112.7 0.123
2022 94.3 0.101
2023 69.2 0.092
2024 43.1 0.098
2025 22.9 0.116
2026 8.7 0.138
2027 358.2 0.156
2028 349.5 0.167
2029 341.6 0.171
2030 333.7 0.168


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



 
 


wds09100-2845c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic