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 |
|
Coord arcsec 2000 |
08 46 46.51 +06 25 07.7 |
|
| Date first |
1888 |
|
Date last |
2021 |
|
Obs |
274 |
|
| Pa first |
142 |
|
Pa last |
324.4 |
|
P.A. Now (θ) |
125.1° |
|
| Sep first |
0.2 |
|
Sep last |
0.077 |
|
Sep. Now (ρ) |
0.202" |
|
| Mag pri |
3.50 |
|
Mag sec |
5.60 |
|
delta mag (ΔM) |
2.1 |
|
Spectral class |
G1III+A8V (yellow/white) |
|
| Pri motion ra |
-228 |
|
Sec motion ra |
|
|
| Pri motion dec |
-044 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
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 |
|
|
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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