16212+2259 HU 481 (HD 147442)
16h 21m 14.74s +22° 59' 18.8" P.A. 237.00 sep 0.5 mag 8.21,10.04 Sp F8 dist. 66.18 pc (215.88 l.y.)
| Coord 2000 |
16212+2259 |
|
Discov num |
HU 481 |
|
Comp |
|
|
Coord arcsec 2000 |
16 21 14.74 +22 59 18.8 |
|
| Date first |
1902 |
|
Date last |
2021 |
|
Obs |
86 |
|
| Pa first |
228 |
|
Pa last |
237.2 |
|
P.A. Now (θ) |
230.5° |
|
| Sep first |
0.5 |
|
Sep last |
0.481 |
|
Sep. Now (ρ) |
0.472" |
|
| Mag pri |
8.21 |
|
Mag sec |
10.04 |
|
delta mag (ΔM) |
1.83 |
|
Spectral class |
F8 (yellow-white) |
|
| Pri motion ra |
-008 |
|
Sec motion ra |
|
|
| Pri motion dec |
-040 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 147442 |
|
Constellation |
Hercules |
|
SAO |
84317 |
|
HIP |
80117 |
|
| Tycho2 |
2043-00283-1 |
|
Gaia DR2 |
1301701718658018048 |
|
HD |
147442 |
|
ADS |
10017 |
|
| BD |
BD+23 2924 |
|
Distance |
66.18 |
|
Distance ly |
215.88 |
|
ORBITAL ELEMENTS
| Period (P) | 119.5y | |
Periastron (T) | 1997.95y | |
Semi-major axis (a) | 0.464a | |
| Eccentricity (e) | 0.567 | |
Inclination (i) | 146.8° | |
Longitude of periastron (ω) | 160.5° | |
| Node (Ω) | 172.6° | |
Notes | n | |
Reference | Hrt2010a | |
| Equinox | 2000 | |
Last observation | 2009 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
346.8 |
0.208 |
| 2001 |
336.8 |
0.214 |
| 2002 |
327.3 |
0.221 |
| 2003 |
318.5 |
0.228 |
| 2004 |
310.1 |
0.236 |
| 2005 |
302.4 |
0.245 |
| 2006 |
295.2 |
0.254 |
| 2007 |
288.5 |
0.264 |
| 2008 |
282.4 |
0.276 |
| 2009 |
276.7 |
0.287 |
| 2010 |
271.5 |
0.300 |
| 2011 |
266.8 |
0.313 |
| 2012 |
262.4 |
0.326 |
| 2013 |
258.3 |
0.339 |
| 2014 |
254.6 |
0.353 |
| 2015 |
251.1 |
0.366 |
| 2016 |
247.9 |
0.380 |
| 2017 |
244.9 |
0.393 |
| 2018 |
242.1 |
0.407 |
| 2019 |
239.5 |
0.420 |
| 2020 |
237.0 |
0.433 |
| 2021 |
234.7 |
0.446 |
| 2022 |
232.6 |
0.459 |
| 2023 |
230.5 |
0.472 |
| 2024 |
228.5 |
0.484 |
| 2025 |
226.7 |
0.496 |
| 2026 |
224.9 |
0.508 |
| 2027 |
223.2 |
0.519 |
| 2028 |
221.6 |
0.530 |
| 2029 |
220.0 |
0.541 |
| 2030 |
218.5 |
0.552 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
