15405+1840 A 2076 (HD 139939)

 
 
15h 40m 28.45s +18° 40' 18.0" P.A. 187.00 sep 0.8 mag 8.28,8.44 Sp A2 dist. 309.6 pc (1009.92 l.y.)
 
 
Coord 2000 15405+1840 Discov num A  2076 Comp Coord arcsec 2000 15 40 28.45 +18 40 18.0
Date first 1909 Date last 2018 Obs 98
Pa first 146 Pa last 187.3 P.A. Now (θ) 187.3°
Sep first 0.2 Sep last 0.75 Sep. Now (ρ) 0.75"
Mag pri 8.28 Mag sec 8.44 delta mag (ΔM) 0.16 Spectral class A2 (white)
Pri motion ra -019 Sec motion ra -019
Pri motion dec +019 Sec motion dec +019
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 139939 Constellation Serpens SAO 101675 HIP 76769
Tycho2 1498-01693-1 Gaia DR2 1209819483295604864 HD 139939 ADS 9742
BD BD+19 3000 Distance 309.6 Distance ly 1009.92
 
 
ORBITAL ELEMENTS
 
 
Period (P)776y Periastron (T)1895y Semi-major axis (a)0.823a
Eccentricity (e)0.38 Inclination (i)73.8° Longitude of periastron (ω)95°
Node (Ω)1.3° Notes ReferenceZir2014a
Equinox2000 Last observation2008 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 183.1 0.707
2001 183.3 0.709
2002 183.4 0.711
2003 183.6 0.713
2004 183.8 0.714
2005 183.9 0.716
2006 184.1 0.718
2007 184.2 0.719
2008 184.4 0.721
2009 184.5 0.722
2010 184.7 0.724
2011 184.9 0.725
2012 185.0 0.726
2013 185.2 0.727
2014 185.3 0.728
2015 185.5 0.730
2016 185.6 0.731
2017 185.8 0.731
2018 185.9 0.732
2019 186.1 0.733
2020 186.2 0.734
2021 186.4 0.735
2022 186.5 0.735
2023 186.7 0.736
2024 186.8 0.737
2025 187.0 0.737
2026 187.1 0.738
2027 187.3 0.738
2028 187.4 0.739
2029 187.6 0.739
2030 187.7 0.739


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


 
  


wds15405%2B1840a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic