15328+1945 HU 577 (HD 138641)

 
 
15h 32m 48.18s +19° 44' 36.1" P.A. 25.00 sep 0.3 mag 8.91,8.94 Sp F5 dist. 88.03 pc (287.15 l.y.)
 
 
Coord 2000 15328+1945 Discov num HU  577 Comp Coord arcsec 2000 15 32 48.18 +19 44 36.1
Date first 1902 Date last 2016 Obs 82
Pa first 24 Pa last 25.1 P.A. Now (θ) 30.9°
Sep first 0.3 Sep last 0.347 Sep. Now (ρ) 0.345"
Mag pri 8.91 Mag sec 8.94 delta mag (ΔM) 0.03 Spectral class F5 (yellow-white)
Pri motion ra -029 Sec motion ra
Pri motion dec +004 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 138641 Constellation Serpens SAO 101607 HIP 76118
Tycho2 1497-00843-1 HD 138641 ADS 9692 BD BD+20 3118
Distance 88.03 Distance ly 287.15
 
 
ORBITAL ELEMENTS
 
 
Period (P)108.2y Periastron (T)1944.45y Semi-major axis (a)0.294a
Eccentricity (e)0.392 Inclination (i)61.9° Longitude of periastron (ω)127.1°
Node (Ω)35.6° Notesn ReferenceSca2020d
Equinox2000 Last observation2020 Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 5.8 0.299
2001 7.1 0.305
2002 8.4 0.310
2003 9.7 0.315
2004 11.0 0.320
2005 12.2 0.325
2006 13.3 0.329
2007 14.5 0.333
2008 15.6 0.337
2009 16.7 0.340
2010 17.7 0.343
2011 18.8 0.346
2012 19.8 0.348
2013 20.8 0.350
2014 21.8 0.352
2015 22.8 0.353
2016 23.8 0.354
2017 24.8 0.354
2018 25.8 0.354
2019 26.8 0.353
2020 27.8 0.352
2021 28.8 0.350
2022 29.9 0.348
2023 30.9 0.345
2024 32.0 0.341
2025 33.0 0.337
2026 34.2 0.333
2027 35.3 0.327
2028 36.5 0.321
2029 37.7 0.315
2030 39.0 0.307


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



 
 


wds15328%2B1945b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic