08468+0625 SP 1 AB (Ashlesha)
08h 46m 46.51s +06° 25' 07.7" P.A. 324.00 sep 0.1 mag 3.50,5.60 Sp G1III+A8V dist. 39.64 pc (129.31 l.y.)
Coord 2000 |
08468+0625 |
|
Discov num |
SP 1 |
|
Comp |
AB |
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Coord arcsec 2000 |
08 46 46.51 +06 25 07.7 |
|
Date first |
1888 |
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Date last |
2021 |
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Obs |
274 |
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Pa first |
142 |
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Pa last |
324.4 |
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P.A. Now (θ) |
125.1° |
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Sep first |
0.2 |
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Sep last |
0.077 |
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Sep. Now (ρ) |
0.202" |
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Mag pri |
3.50 |
|
Mag sec |
5.60 |
|
delta mag (ΔM) |
2.1 |
|
Spectral class |
G1III+A8V (yellow/white) |
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Pri motion ra |
-228 |
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Sec motion ra |
|
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Pri motion dec |
-044 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
08468+0625 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
Ashlesha |
117112 |
08 46 47 +06 25 08 |
SP 1 AB |
2021 |
274 |
324 |
0.1 |
3.50 |
5.60 |
2.10 |
Y |
<=== |
Show |
Eps Hya |
117112 |
08 46 47 +06 25 08 |
STF 1273 AB,C |
2020 |
441 |
311 |
2.9 |
3.49 |
6.66 |
3.17 |
Y |
|
Show |
|
117112 |
08 46 47 +06 25 08 |
STF 1273 AB,D |
2017 |
23 |
201 |
18.1 |
3.49 |
12.50 |
9.01 |
|
|
Show |
|
117112 |
08 46 47 +06 25 08 |
STF 1273 AB,E |
2015 |
8 |
2 |
340.5 |
3.49 |
10.78 |
7.29 |
|
|
Show |
|
117112 |
08 46 47 +06 25 08 |
STF 1273 AB,F |
2015 |
9 |
265 |
406.5 |
3.49 |
10.39 |
6.90 |
|
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Sextuple system
7 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Common name |
Ashlesha |
|
Constellation |
Hydra |
|
SAO |
117112 |
|
HIP |
43109 |
|
Tycho2 |
0224-01333-1 |
|
Gaia DR2 |
583151353573508096 |
|
HD |
74874 |
|
HR |
3482 |
|
GC |
12102 |
|
ADS |
6993 |
|
BD |
BD+06 2036 |
|
Bayer |
Epsilon Hydrae |
|
Bayer name |
Eps Hya |
|
Flamsteed |
11 Hydrae |
|
Flamsteed name |
11 Hya |
|
Distance |
39.64 |
|
Distance ly |
129.31 |
|
Bayer greek |
ε Hya |
|
ORBITAL ELEMENTS
Period (P) | 15.0507y | ± 0.0064 |
Periastron (T) | 1991.247y | ± 0.005 |
Semi-major axis (a) | 0.2547a | ± 0.0009 |
Eccentricity (e) | 0.6558 | ± 0.0018 |
Inclination (i) | 50.01° | ± 0.27 |
Longitude of periastron (ω) | 266.1° | ± 0.27 |
Node (Ω) | 107.99° | ± 0.35 |
Notes | n | |
Reference | Hrt1996a | |
Equinox | 2000 | |
Last observation | | |
Grade | 1 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
204.6 |
0.267 |
2001 |
215.4 |
0.261 |
2002 |
226.9 |
0.252 |
2003 |
239.3 |
0.239 |
2004 |
253.7 |
0.217 |
2005 |
272.8 |
0.176 |
2006 |
319.8 |
0.083 |
2007 |
99.0 |
0.128 |
2008 |
126.0 |
0.205 |
2009 |
140.9 |
0.242 |
2010 |
152.8 |
0.261 |
2011 |
163.4 |
0.270 |
2012 |
173.6 |
0.274 |
2013 |
183.6 |
0.274 |
2014 |
193.7 |
0.271 |
2015 |
204.1 |
0.267 |
2016 |
214.9 |
0.261 |
2017 |
226.3 |
0.253 |
2018 |
238.6 |
0.240 |
2019 |
252.9 |
0.219 |
2020 |
271.6 |
0.179 |
2021 |
314.6 |
0.089 |
2022 |
96.5 |
0.122 |
2023 |
125.1 |
0.202 |
2024 |
140.3 |
0.240 |
2025 |
152.2 |
0.260 |
2026 |
162.9 |
0.270 |
2027 |
173.1 |
0.274 |
2028 |
183.1 |
0.274 |
2029 |
193.2 |
0.272 |
2030 |
203.6 |
0.267 |
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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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