11191-3100 I 506 (HD 98415)

 
 
11h 19m 04.62s -31° 00' 22.3" P.A. 173.00 sep 0.8 mag 8.24,9.37 Sp G2/3V dist. 93.63 pc (305.42 l.y.)
 
 
Coord 2000 11191-3100 Discov num I   506 Comp Coord arcsec 2000 11 19 04.62 -31 00 22.3
Date first 1909 Date last 2016 Obs 27
Pa first 100 Pa last 172.6 P.A. Now (θ) 172.6°
Sep first 1.0 Sep last 0.794 Sep. Now (ρ) 0.794"
Mag pri 8.24 Mag sec 9.37 delta mag (ΔM) 1.13 Spectral class G2/3V (yellow)
Pri motion ra -077 Sec motion ra -077
Pri motion dec +071 Sec motion dec +071
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 98415 Constellation Hydra SAO 202316 HIP 55258
Tycho2 7202-00516-1 Gaia DR2 5404014958061662720 HD 98415 CD CD-30 9107
CP CP-30 3311 Distance 93.63 Distance ly 305.42
 
 
ORBITAL ELEMENTS
 
 
Period (P)585y Periastron (T)2460y Semi-major axis (a)1.94a
Eccentricity (e)0.634 Inclination (i)71.3° Longitude of periastron (ω)301.3°
Node (Ω)87.6° Notes ReferenceUSN2002
Equinox2000 Last observation1991 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 162.9 0.786
2001 163.8 0.786
2002 164.7 0.787
2003 165.6 0.787
2004 166.6 0.788
2005 167.5 0.789
2006 168.4 0.790
2007 169.3 0.792
2008 170.2 0.793
2009 171.2 0.795
2010 172.1 0.797
2011 173.0 0.799
2012 173.9 0.801
2013 174.8 0.803
2014 175.6 0.806
2015 176.5 0.808
2016 177.4 0.811
2017 178.3 0.814
2018 179.1 0.817
2019 180.0 0.820
2020 180.8 0.823
2021 181.7 0.827
2022 182.5 0.830
2023 183.4 0.834
2024 184.2 0.838
2025 185.0 0.842
2026 185.8 0.846
2027 186.6 0.850
2028 187.4 0.855
2029 188.2 0.859
2030 188.9 0.864


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



 
 


wds11191-3100a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic