15405+1840 A  2076

 
 
15H 40M 28.45S +18 40' 18.0" P.A. 185.9 SEP 0.73 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
2015
Obs
86
Pa first
146
Pa last
186
P.A. Now (θ)
185.9°
Sep first
0.2
Sep last
0.8
Sep. Now (ρ)
0.73"
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
 
 
Constellation
Serpens
SAO
101675
HIP
76769
Tycho2
1498-01693-1
HD
139939
ADS
9742
BD
BD+19 3000
Distance
309.6
Distance ly
1009.92
last precise pa
185.9
last precise sep
0.76
 
 
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° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2008
label rho theta
2000 0.707 183.1
2001 0.709 183.3
2002 0.711 183.4
2003 0.713 183.6
2004 0.714 183.8
2005 0.716 183.9
2006 0.718 184.1
2007 0.719 184.2
2008 0.721 184.4
2009 0.722 184.5
2010 0.724 184.7
2011 0.725 184.9
2012 0.726 185.0
2013 0.727 185.2
2014 0.728 185.3
2015 0.730 185.5
2016 0.731 185.6
2017 0.731 185.8
2018 0.732 185.9
2019 0.733 186.1
2020 0.734 186.2
2021 0.735 186.4
2022 0.735 186.5
2023 0.736 186.7
2024 0.737 186.8
2025 0.737 187.0
2026 0.738 187.1
2027 0.738 187.3
2028 0.739 187.4
2029 0.739 187.6
2030 0.739 187.7

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic