15457+5040 HU  657

 
 
15H 45M 40.74S +50 40' 20.8" P.A. 175.5 SEP 0.51 MAG 10.25,10.95 SP K0 DIST. 141.44 PC (461.38 L.Y.)
 
 
Coord 2000
15457+5040
Discov num
HU  657
Comp
Coord arcsec 2000
15 45 40.74 +50 40 20.8
Date first
1904
Date last
2008
Obs
21
Pa first
123
Pa last
181
P.A. Now (θ)
175.5°
Sep first
0.6
Sep last
0.4
Sep. Now (ρ)
0.51"
Mag pri
10.25
Mag sec
10.95
delta mag (ΔM)
0.7
Spectral class
K0 (yellow-orange)
Pri motion ra
-015
Sec motion ra
Pri motion dec
+045
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Bootes
SAO
29647
HIP
77188
Tycho2
3496-01461-1
HD
234257
ADS
9781
BD
BD+51 2028
Distance
141.44
Distance ly
461.38
last precise pa
181.3
last precise sep
0.419
 
 
ORBITAL ELEMENTS
 
 
Period (P)371.5y Periastron (T)1974.3y Semi-major axis (a)0.581a
Eccentricity (e)0.74 Inclination (i)123.9° Longitude of periastron (ω)202.7°
Node (Ω)162° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2008
label rho theta
2000 0.317 188.9
2001 0.330 187.7
2002 0.342 186.6
2003 0.353 185.6
2004 0.365 184.7
2005 0.377 183.8
2006 0.388 182.9
2007 0.399 182.1
2008 0.410 181.4
2009 0.421 180.7
2010 0.431 180.0
2011 0.442 179.4
2012 0.452 178.7
2013 0.462 178.1
2014 0.472 177.6
2015 0.482 177.0
2016 0.491 176.5
2017 0.501 176.0
2018 0.510 175.5
2019 0.519 175.1
2020 0.528 174.6
2021 0.537 174.2
2022 0.546 173.8
2023 0.555 173.4
2024 0.563 173.0
2025 0.571 172.6
2026 0.580 172.2
2027 0.588 171.9
2028 0.596 171.5
2029 0.603 171.2
2030 0.611 170.9

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