15457+5040 HU 657 (HD 234257)

 
 
15h 45m 40.74s +50° 40' 20.8" P.A. 177.00 sep 0.5 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 2016 Obs 24
Pa first 123 Pa last 177.1 P.A. Now (θ) 177.1°
Sep first 0.6 Sep last 0.511 Sep. Now (ρ) 0.511"
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
 
 
Name HD 234257 Constellation Bootes SAO 29647 HIP 77188
Tycho2 3496-01461-1 Gaia DR2 1404099236552329216 HD 234257 ADS 9781
BD BD+51 2028 Distance 141.44 Distance ly 461.38
 
 
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° Notes ReferenceDoc2012k
Equinox2000 Last observation2008 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 188.9 0.317
2001 187.7 0.330
2002 186.6 0.342
2003 185.6 0.353
2004 184.7 0.365
2005 183.8 0.377
2006 182.9 0.388
2007 182.1 0.399
2008 181.4 0.410
2009 180.7 0.421
2010 180.0 0.431
2011 179.4 0.442
2012 178.7 0.452
2013 178.1 0.462
2014 177.6 0.472
2015 177.0 0.482
2016 176.5 0.491
2017 176.0 0.501
2018 175.5 0.510
2019 175.1 0.519
2020 174.6 0.528
2021 174.2 0.537
2022 173.8 0.546
2023 173.4 0.555
2024 173.0 0.563
2025 172.6 0.571
2026 172.2 0.580
2027 171.9 0.588
2028 171.5 0.596
2029 171.2 0.603
2030 170.9 0.611


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



 
 


wds15457%2B5040a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic