11158+4227 COU 1904 (HD 97857)
11h 15m 49.68s +42° 26' 58.1" P.A. 212.00 sep 0.6 mag 8.33,9.46 Sp F8
Coord 2000 |
11158+4227 |
|
Discov num |
COU1904 |
|
Comp |
|
|
Coord arcsec 2000 |
11 15 49.68 +42 26 58.1 |
|
Date first |
1981 |
|
Date last |
2018 |
|
Obs |
34 |
|
Pa first |
197 |
|
Pa last |
211.6 |
|
P.A. Now (θ) |
211.6° |
|
Sep first |
0.3 |
|
Sep last |
0.55 |
|
Sep. Now (ρ) |
0.55" |
|
Mag pri |
8.33 |
|
Mag sec |
9.46 |
|
delta mag (ΔM) |
1.13 |
|
Spectral class |
F8 (yellow-white) |
|
Pri motion ra |
-111 |
|
Sec motion ra |
-111 |
|
Pri motion dec |
-004 |
|
Sec motion dec |
-004 |
|
Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 97857 |
|
Constellation |
Ursa Major |
|
SAO |
43667 |
|
Tycho2 |
3012-01939-1 |
|
Gaia DR2 |
783699972376844800 |
|
HD |
97857 |
|
GC |
15478 |
|
ORBITAL ELEMENTS
Period (P) | 228.3y | ± 27.6 |
Periastron (T) | 1972.7y | ± 1.1 |
Semi-major axis (a) | 0.559a | ± 0.044 |
Eccentricity (e) | 0.513 | ± 0.015 |
Inclination (i) | 79.1° | ± 0.3 |
Longitude of periastron (ω) | 104° | ± 6 |
Node (Ω) | 20.8° | ± 0.2 |
Notes | | |
Reference | BAE2021 | |
Equinox | | |
Last observation | | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
206.3 |
0.417 |
2001 |
206.7 |
0.418 |
2002 |
207.2 |
0.418 |
2003 |
207.6 |
0.418 |
2004 |
208.1 |
0.417 |
2005 |
208.6 |
0.417 |
2006 |
209.0 |
0.415 |
2007 |
209.5 |
0.414 |
2008 |
209.9 |
0.412 |
2009 |
210.4 |
0.409 |
2010 |
210.9 |
0.407 |
2011 |
211.4 |
0.404 |
2012 |
211.9 |
0.400 |
2013 |
212.4 |
0.397 |
2014 |
212.9 |
0.393 |
2015 |
213.4 |
0.389 |
2016 |
214.0 |
0.385 |
2017 |
214.5 |
0.381 |
2018 |
215.1 |
0.376 |
2019 |
215.6 |
0.371 |
2020 |
216.2 |
0.366 |
2021 |
216.8 |
0.361 |
2022 |
217.5 |
0.356 |
2023 |
218.1 |
0.350 |
2024 |
218.8 |
0.345 |
2025 |
219.4 |
0.339 |
2026 |
220.1 |
0.334 |
2027 |
220.9 |
0.328 |
2028 |
221.6 |
0.322 |
2029 |
222.4 |
0.316 |
2030 |
223.2 |
0.310 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|