01315+1521 BU  506 (Eta Psc)

 
 
01H 31M 28.99S +15 20' 45.0" P.A. 71.5 SEP 0.48 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
62
P.A. Now (θ)
71.5°
Sep first
1.0
Sep last
0.6
Sep. Now (ρ)
0.48"
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
 
 
Name
Eta Psc
Constellation
Pisces
SAO
92484
HIP
7097
Tycho2
1198-01597-1
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
Distance
107.18
Distance ly
349.62
last precise pa
61.8
last precise sep
0.61
 
 
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 Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation2000
label rho theta
2000 0.626 54.7
2001 0.618 55.5
2002 0.609 56.3
2003 0.600 57.1
2004 0.591 57.9
2005 0.582 58.8
2006 0.574 59.7
2007 0.565 60.6
2008 0.556 61.5
2009 0.547 62.5
2010 0.538 63.5
2011 0.529 64.5
2012 0.520 65.6
2013 0.512 66.7
2014 0.503 67.8
2015 0.494 69.0
2016 0.485 70.2
2017 0.477 71.5
2018 0.468 72.8
2019 0.460 74.2
2020 0.452 75.6
2021 0.443 77.1
2022 0.435 78.6
2023 0.428 80.2
2024 0.420 81.8
2025 0.413 83.5
2026 0.405 85.3
2027 0.399 87.1
2028 0.392 89.0
2029 0.386 91.0
2030 0.380 93.0

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