01541-7729 JSP 31 (HD 12121)

 
 
01h 54m 06.06s -77° 29' 28.5" P.A. 52.00 sep 0.3 mag 7.55,8.25 Sp A8IV/V dist. 147.93 pc (482.55 l.y.)
 
 
Coord 2000 01541-7729 Discov num JSP  31 Comp Coord arcsec 2000 01 54 06.06 -77 29 28.5
Date first 1929 Date last 2016 Obs 8
Pa first 354 Pa last 52.2 P.A. Now (θ) 52.2°
Sep first 0.2 Sep last 0.311 Sep. Now (ρ) 0.311"
Mag pri 7.55 Mag sec 8.25 delta mag (ΔM) 0.7 Spectral class A8IV/V (white)
Pri motion ra +012 Sec motion ra
Pri motion dec +039 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 12121 Constellation Hydrus SAO 255831 HIP 8866
Tycho2 9352-01737-1 HD 12121 GC 2337 CP CP-78 40
Distance 147.93 Distance ly 482.55
 
 
ORBITAL ELEMENTS
 
 
Period (P)250y Periastron (T)1968.23y Semi-major axis (a)0.43a
Eccentricity (e)0.5 Inclination (i)112.1° Longitude of periastron (ω)180.1°
Node (Ω)25.5° Notes ReferenceTok2017c
Equinox2000 Last observation2016 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 81.3 0.162
2001 78.1 0.170
2002 75.3 0.178
2003 72.7 0.187
2004 70.3 0.195
2005 68.1 0.204
2006 66.1 0.213
2007 64.3 0.222
2008 62.6 0.231
2009 61.1 0.240
2010 59.6 0.250
2011 58.3 0.259
2012 57.0 0.268
2013 55.8 0.277
2014 54.7 0.286
2015 53.7 0.294
2016 52.7 0.303
2017 51.8 0.312
2018 51.0 0.321
2019 50.1 0.329
2020 49.4 0.338
2021 48.6 0.346
2022 47.9 0.354
2023 47.2 0.362
2024 46.6 0.371
2025 46.0 0.378
2026 45.4 0.386
2027 44.8 0.394
2028 44.3 0.402
2029 43.7 0.409
2030 43.2 0.417


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



 
 


wds01541-7729e.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic