20289-1749 SHJ 323 AB (Rho Cap)

 
 
20h 28m 51.62s -17° 48' 49.2" P.A. 189.00 sep 1.7 mag 4.97,6.88 Sp F3V dist. 30.27 pc (98.74 l.y.)
 
 
Coord 2000 20289-1749 Discov num SHJ 323 Comp AB Coord arcsec 2000 20 28 51.62 -17 48 49.2
Date first 1823 Date last 2018 Obs 78
Pa first 177 Pa last 188.9 P.A. Now (θ) 188.9°
Sep first 4.0 Sep last 1.684 Sep. Now (ρ) 1.684"
Mag pri 4.97 Mag sec 6.88 delta mag (ΔM) 1.91 Spectral class F3V (yellow-white)
Pri motion ra -003 Sec motion ra -003
Pri motion dec -017 Sec motion dec -017
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
20289-1749 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Rho Cap 163614 20 28 52 -17 48 49 SHJ 323 AB 2018 78 189 1.7 4.97 6.88 1.91 Y <===
Show 163614 20 28 52 -17 48 49 BU 61 AC 2008 10 150 54.6 4.97 13.30 8.33
Show 163617 20 28 52 -17 48 49 SHJ 323 AD 2011 28 150 258.7 4.97 6.68 1.71
Show 163614 20 28 52 -17 48 49 BU 61 BC 2015 5 149 53.5 6.88 12.50 5.62
Show 163617 20 29 01 -17 52 31 DOB 13 DE 2020 6 93 53.5 6.67 10.60 3.93
Quintuple system
5 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Rho Cap Constellation Capricornus SAO 163614 HIP 101027
Tycho2 6333-02128-1 Gaia DR2 6860945174279114880 HD 194943 HR 7822
GC 28481 ADS 13887 GL Gl 791.1A BD BD-18 5689
Bayer Rho Capricorni Bayer name Rho Cap Flamsteed 11 Capricorni Flamsteed name 11 Cap
Distance 30.27 Distance ly 98.74 Bayer greek ρ Cap
 
 
ORBITAL ELEMENTS
 
 
Period (P)375.9934y± 35.3768 Periastron (T)1963.1816y± 0.9798 Semi-major axis (a)2.49532a± 0.28841
Eccentricity (e)0.96563± 0.00996 Inclination (i)112.355°± 2.353 Longitude of periastron (ω)125.842°± 5.728
Node (Ω)150.379°± 2.937 Notesn ReferenceIzm2019
Equinox Last observation2013 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 195.2 1.269
2001 194.9 1.295
2002 194.5 1.321
2003 194.2 1.346
2004 193.9 1.372
2005 193.6 1.397
2006 193.3 1.421
2007 193.0 1.446
2008 192.7 1.470
2009 192.4 1.494
2010 192.2 1.517
2011 191.9 1.541
2012 191.7 1.564
2013 191.4 1.587
2014 191.2 1.609
2015 191.0 1.632
2016 190.8 1.654
2017 190.6 1.676
2018 190.3 1.698
2019 190.1 1.719
2020 189.9 1.741
2021 189.8 1.762
2022 189.6 1.783
2023 189.4 1.804
2024 189.2 1.824
2025 189.0 1.845
2026 188.9 1.865
2027 188.7 1.885
2028 188.5 1.904
2029 188.4 1.924
2030 188.2 1.943


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



 
 


wds20289-1749c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic