00572+2325 MKT 2 Aa,Ab
00h 57m 12.43s +23° 25' 03.9" P.A. 41.00 sep 0.0 mag 4.42, Sp G8IIIb dist. 70.42 pc (229.71 l.y.)
| Coord 2000 |
00572+2325 |
|
Discov num |
MKT 2 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
00 57 12.43 +23 25 03.9 |
|
| Date first |
1990 |
|
Date last |
1992 |
|
Obs |
23 |
|
| Pa first |
157 |
|
Pa last |
40.5 |
|
P.A. Now (θ) |
40.5° |
|
| Sep first |
0.0 |
|
Sep last |
0.01 |
|
Sep. Now (ρ) |
0.01" |
|
| Mag pri |
4.42 |
|
Mag sec |
|
|
delta mag (ΔM) |
|
|
Spectral class |
G8IIIb (yellow) |
|
| Pri motion ra |
-044 |
|
Sec motion ra |
|
|
| Pri motion dec |
-045 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
00572+2325 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
74388 |
00 57 12 +23 25 04 |
MKT 2 Aa,Ab |
1992 |
23 |
41 |
0.0 |
4.42 |
|
|
Y |
<=== |
| Show |
Eta And |
74388 |
00 57 12 +23 25 04 |
FOX 116 AB |
2001 |
8 |
232 |
129.3 |
4.42 |
12.34 |
7.92 |
|
|
Triple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Andromeda |
|
SAO |
74388 |
|
HIP |
4463 |
|
Tycho2 |
1740-02109-1 |
|
| Gaia DR2 |
2803727059958899584 |
|
HD |
5516 |
|
HR |
271 |
|
GC |
1136 |
|
| BD |
BD+22 153 |
|
Bayer |
Eta Andromedae |
|
Bayer name |
Eta And |
|
Flamsteed |
38 Andromedae |
|
| Flamsteed name |
38 And |
|
FK5 |
2060 |
|
Distance |
70.42 |
|
Distance ly |
229.71 |
|
| Bayer greek |
η And |
|
ORBITAL ELEMENTS
| Period (P) | 115.72d | ± 0.01 |
Periastron (T) | 48013d (1990.331y) | ± 1 |
Semi-major axis (a) | 10.37m | ± 0.03 |
| Eccentricity (e) | 0.006 | ± 0.002 |
Inclination (i) | 30.5° | ± 0.4 |
Longitude of periastron (ω) | 215° | ± 4 |
| Node (Ω) | 69.4° | ± 0.5 |
Notes | n | |
Reference | MkT1993b | |
| Equinox | | |
Last observation | 1992 | |
Grade | 1 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000-01-01 |
106.6 |
0.010 |
| 2001-01-01 |
167.6 |
0.009 |
| 2002-01-01 |
226.0 |
0.010 |
| 2003-01-01 |
276.0 |
0.010 |
| 2004-01-01 |
335.9 |
0.009 |
| 2005-01-01 |
36.7 |
0.010 |
| 2006-01-01 |
86.0 |
0.010 |
| 2007-01-01 |
141.9 |
0.009 |
| 2008-01-01 |
204.4 |
0.010 |
| 2009-01-01 |
255.8 |
0.010 |
| 2010-01-01 |
310.2 |
0.009 |
| 2011-01-01 |
14.2 |
0.009 |
| 2012-01-01 |
66.7 |
0.010 |
| 2013-01-01 |
117.7 |
0.010 |
| 2014-01-01 |
180.4 |
0.009 |
| 2015-01-01 |
236.1 |
0.010 |
| 2016-01-01 |
286.8 |
0.010 |
| 2017-01-01 |
349.1 |
0.009 |
| 2018-01-01 |
47.1 |
0.010 |
| 2019-01-01 |
96.1 |
0.010 |
| 2020-01-01 |
154.7 |
0.009 |
| 2021-01-01 |
215.5 |
0.010 |
| 2022-01-01 |
265.8 |
0.010 |
| 2023-01-01 |
322.9 |
0.009 |
| 2024-01-01 |
25.8 |
0.010 |
| 2025-01-01 |
76.4 |
0.010 |
| 2026-01-01 |
129.5 |
0.009 |
| 2027-01-01 |
192.8 |
0.009 |
| 2028-01-01 |
246.0 |
0.010 |
| 2029-01-01 |
298.2 |
0.009 |
| 2030-01-01 |
1.9 |
0.009 |
|
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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