18440+0321 A  2388

 
 
18H 43M 59.30S +03 20' 38.2" P.A. 133.6 SEP 0.26 MAG 8.59,9.56 SP A0 DIST. 209.64 PC (683.85 L.Y.)
 
 
Coord 2000
18440+0321
Discov num
A  2388
Comp
Coord arcsec 2000
18 43 59.30 +03 20 38.2
Date first
1910
Date last
1995
Obs
19
Pa first
56
Pa last
121
P.A. Now (θ)
133.6°
Sep first
0.3
Sep last
0.2
Sep. Now (ρ)
0.26"
Mag pri
8.59
Mag sec
9.56
delta mag (ΔM)
0.97
Spectral class
A0 (white)
Pri motion ra
+004
Sec motion ra
Pri motion dec
-018
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Serpens
HIP
91893
Tycho2
0451-00548-1
HD
173196
ADS
11619
BD
BD+03 3787
Distance
209.64
Distance ly
683.85
last precise pa
121.1
last precise sep
0.18
 
 
ORBITAL ELEMENTS
 
 
Period (P)330y Periastron (T)1942.4y Semi-major axis (a)0.453a
Eccentricity (e)0.85 Inclination (i)70.3° Longitude of periastron (ω)96°
Node (Ω)254.7° Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation2012
label rho theta
2000 0.251 122.5
2001 0.252 123.1
2002 0.252 123.7
2003 0.252 124.4
2004 0.253 125.0
2005 0.253 125.6
2006 0.253 126.2
2007 0.254 126.9
2008 0.254 127.5
2009 0.254 128.1
2010 0.254 128.7
2011 0.255 129.3
2012 0.255 129.9
2013 0.255 130.5
2014 0.255 131.2
2015 0.255 131.8
2016 0.256 132.4
2017 0.256 133.0
2018 0.256 133.6
2019 0.256 134.2
2020 0.257 134.8
2021 0.257 135.4
2022 0.257 136.0
2023 0.257 136.6
2024 0.258 137.2
2025 0.258 137.8
2026 0.258 138.4
2027 0.258 139.0
2028 0.258 139.6
2029 0.259 140.2
2030 0.259 140.8

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