01315+1521 BU 506 (Alpherg)

 
 
01h 31m 28.99s +15° 20' 45.0" P.A. 62.00 sep 0.6 mag 3.83,7.51 Sp G8III dist. 107.18 pc (349.62 l.y.)
 
 
Coord 2000 01315+1521 Discov num BU  506 Comp Coord arcsec 2000 01 31 28.99 +15 20 45.0
Date first 1878 Date last 2008 Obs 28
Pa first 13 Pa last 61.8 P.A. Now (θ) 61.8°
Sep first 1.0 Sep last 0.61 Sep. Now (ρ) 0.61"
Mag pri 3.83 Mag sec 7.51 delta mag (ΔM) 3.68 Spectral class G8III (yellow)
Pri motion ra +028 Sec motion ra
Pri motion dec -006 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name Alpherg Var name NSV532 Psc Constellation Pisces SAO 92484
HIP 7097 Tycho2 1198-01597-1 Gaia DR2 2591891443195389696 HD 9270
HR 437 GC 1839 ADS 1199 BD BD+14 231
Bayer Eta Piscium Bayer name Eta Psc Flamsteed 99 Piscium Flamsteed name 99 Psc
FK5 50 Distance 107.18 Distance ly 349.62 Bayer greek η Psc
 
 
ORBITAL ELEMENTS
 
 
Period (P)850.5y± 66.5 Periastron (T)2040.3y± 66.9 Semi-major axis (a)1.228a± 0.144
Eccentricity (e)0.469± 0.053 Inclination (i)58.5°± 2.5 Longitude of periastron (ω)86.9°± 4
Node (Ω)32.8°± 2 Notesn ReferenceCve2010e
Equinox2000 Last observation2000 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 54.7 0.626
2001 55.5 0.618
2002 56.3 0.609
2003 57.1 0.600
2004 57.9 0.591
2005 58.8 0.582
2006 59.7 0.574
2007 60.6 0.565
2008 61.5 0.556
2009 62.5 0.547
2010 63.5 0.538
2011 64.5 0.529
2012 65.6 0.520
2013 66.7 0.512
2014 67.8 0.503
2015 69.0 0.494
2016 70.2 0.485
2017 71.5 0.477
2018 72.8 0.468
2019 74.2 0.460
2020 75.6 0.452
2021 77.1 0.443
2022 78.6 0.435
2023 80.2 0.428
2024 81.8 0.420
2025 83.5 0.413
2026 85.3 0.405
2027 87.1 0.399
2028 89.0 0.392
2029 91.0 0.386
2030 93.0 0.380


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



 
 


wds01315%2B1521b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic