18261+0047 BU 1203

 
 
18H 26M 03.38S +00 46' 49.7" P.A. 158.1 SEP 0.5 MAG 7.11,8.73 SP A7III DIST. 134.77 PC (439.62 L.Y.)
 
 
Coord 2000
18261+0047
Discov num
BU 1203
Comp
Coord arcsec 2000
18 26 03.38 +00 46 49.7
Date first
1890
Date last
2011
Obs
96
Pa first
68
Pa last
156
P.A. Now (θ)
158.1°
Sep first
0.3
Sep last
0.5
Sep. Now (ρ)
0.5"
Mag pri
7.11
Mag sec
8.73
delta mag (ΔM)
1.62
Spectral class
A7III (white)
Pri motion ra
+017
Sec motion ra
+017
Pri motion dec
+008
Sec motion dec
+008
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Serpens
SAO
123471
HIP
90347
Tycho2
0433-00027-1
HD
169725
ADS
11339
BD
BD+00 3931
Distance
134.77
Distance ly
439.62
last precise pa
156.1
last precise sep
0.498
 
 
ORBITAL ELEMENTS
 
 
Period (P)495.73y Periastron (T)2315.02y Semi-major axis (a)0.5151a
Eccentricity (e)0.4634 Inclination (i)59.29° Longitude of periastron (ω)317.13°
Node (Ω)17.64° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation1991
label rho theta
2000 0.454 151.6
2001 0.456 152.0
2002 0.459 152.4
2003 0.462 152.8
2004 0.464 153.2
2005 0.467 153.6
2006 0.470 154.0
2007 0.473 154.4
2008 0.475 154.8
2009 0.478 155.2
2010 0.480 155.6
2011 0.483 155.9
2012 0.486 156.3
2013 0.488 156.7
2014 0.491 157.0
2015 0.494 157.4
2016 0.496 157.8
2017 0.499 158.1
2018 0.501 158.5
2019 0.504 158.8
2020 0.507 159.1
2021 0.509 159.5
2022 0.512 159.8
2023 0.514 160.1
2024 0.517 160.5
2025 0.519 160.8
2026 0.522 161.1
2027 0.524 161.4
2028 0.527 161.8
2029 0.529 162.1
2030 0.532 162.4

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