00258+1025 HDS 57 (HD 2157)

 
 
00h 25m 49.78s +10 25' 24.1" P.A. 340.00 sep 0.1 mag 9.71,10.71 Sp G0 dist. 110.13 pc (359.24 l.y.)
 
 
Coord 2000 00258+1025 Discov num HDS  57 Comp Coord arcsec 2000 00 25 49.78 +10 25 24.1
Date first 1991 Date last 2021 Obs 14
Pa first 157 Pa last 339.9 P.A. Now (θ) 339.9°
Sep first 0.2 Sep last 0.056 Sep. Now (ρ) 0.056"
Mag pri 9.71 Mag sec 10.71 delta mag (ΔM) 1 Spectral class G0 (yellow)
Pri motion ra +066 Sec motion ra
Pri motion dec +049 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 2157 Constellation Pisces SAO 91889 HIP 2035
Tycho2 0599-00603-1 Gaia DR2 2754101912605043584 HD 2157 BD BD+09 41
Distance 110.13 Distance ly 359.24
 
 
ORBITAL ELEMENTS
 
 
Period (P)96.7y Periastron (T)2019.26y Semi-major axis (a)0.179a
Eccentricity (e)0.527 Inclination (i)131.8° Longitude of periastron (ω)47.4°
Node (Ω)52.9° Notes ReferenceTok2021c
Equinox2000 Last observation2021 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 133.3 0.133
2001 129.4 0.130
2002 125.3 0.127
2003 121.0 0.125
2004 116.6 0.123
2005 112.1 0.121
2006 107.4 0.119
2007 102.5 0.117
2008 97.6 0.116
2009 92.5 0.114
2010 87.2 0.113
2011 81.8 0.111
2012 76.2 0.109
2013 70.3 0.106
2014 64.1 0.103
2015 57.4 0.098
2016 50.0 0.093
2017 41.7 0.087
2018 32.0 0.080
2019 20.4 0.073
2020 6.2 0.066
2021 349.5 0.062
2022 331.4 0.061
2023 314.0 0.064
2024 299.1 0.071
2025 287.2 0.080
2026 277.8 0.090
2027 270.4 0.101
2028 264.4 0.112
2029 259.4 0.122
2030 255.3 0.132


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



 
 


wds00258%2B1025a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic