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 |
Notes | n | |
Reference | Cve2010e | |
Equinox | 2000 | |
Last observation | 2000 | |
Grade | 5 | (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 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|