18463-2721 B   405

 
 
18H 46M 16.27S -27 20' 46.9" P.A. 139.7 SEP 0.51 MAG 8.66,9.30 SP G2V DIST. 72.15 PC (235.35 L.Y.)
 
 
Coord 2000
18463-2721
Discov num
B   405
Comp
Coord arcsec 2000
18 46 16.27 -27 20 46.9
Date first
1927
Date last
2014
Obs
18
Pa first
143
Pa last
141
P.A. Now (θ)
139.7°
Sep first
0.5
Sep last
0.5
Sep. Now (ρ)
0.51"
Mag pri
8.66
Mag sec
9.30
delta mag (ΔM)
0.64
Spectral class
G2V (yellow)
Pri motion ra
-019
Sec motion ra
-019
Pri motion dec
-063
Sec motion dec
-063
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Sagittarius
HIP
92104
Tycho2
6867-00158-1
HD
173427
ADS
11643
CD
CD-2713181
CP
CP-27 6516
Distance
72.15
Distance ly
235.35
last precise pa
140.8
last precise sep
0.52
 
 
ORBITAL ELEMENTS
 
 
Period (P)87.95y Periastron (T)1967.62y Semi-major axis (a)0.343a
Eccentricity (e)0.559 Inclination (i)135.3° Longitude of periastron (ω)14°
Node (Ω)336.5° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation1991
label rho theta
2000 0.507 158.5
2001 0.512 157.4
2002 0.516 156.3
2003 0.520 155.2
2004 0.523 154.2
2005 0.525 153.2
2006 0.527 152.1
2007 0.528 151.1
2008 0.529 150.1
2009 0.529 149.1
2010 0.529 148.1
2011 0.528 147.1
2012 0.526 146.0
2013 0.524 145.0
2014 0.522 144.0
2015 0.519 142.9
2016 0.515 141.9
2017 0.511 140.8
2018 0.506 139.7
2019 0.501 138.6
2020 0.495 137.4
2021 0.489 136.2
2022 0.482 135.0
2023 0.475 133.8
2024 0.467 132.5
2025 0.459 131.2
2026 0.450 129.8
2027 0.441 128.4
2028 0.431 126.9
2029 0.420 125.3
2030 0.410 123.7

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