18261+0047 BU 1203 (HD 169725)
18h 26m 03.38s +00° 46' 49.7" P.A. 157.00 sep 0.5 mag 7.11,8.73 Sp A7III dist. 134.77 pc (439.62 l.y.)
| Coord 2000 |
18261+0047 |
|
Discov num |
BU 1203 |
|
Comp |
|
|
Coord arcsec 2000 |
18 26 03.38 +00 46 49.7 |
|
| Date first |
1890 |
|
Date last |
2018 |
|
Obs |
100 |
|
| Pa first |
68 |
|
Pa last |
157.3 |
|
P.A. Now (θ) |
157.3° |
|
| Sep first |
0.3 |
|
Sep last |
0.507 |
|
Sep. Now (ρ) |
0.507" |
|
| Mag pri |
7.11 |
|
Mag sec |
8.73 |
|
delta mag (ΔM) |
1.62 |
|
Spectral class |
A7III (white) |
|
| Pri motion ra |
+017 |
|
Sec motion ra |
+017 |
|
| Pri motion dec |
+008 |
|
Sec motion dec |
+008 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 169725 |
|
Constellation |
Serpens |
|
SAO |
123471 |
|
HIP |
90347 |
|
| Tycho2 |
0433-00027-1 |
|
Gaia DR2 |
4276317590229462400 |
|
HD |
169725 |
|
GC |
25158 |
|
| ADS |
11339 |
|
BD |
BD+00 3931 |
|
Distance |
134.77 |
|
Distance ly |
439.62 |
|
ORBITAL ELEMENTS
| Period (P) | 495.73y | |
Periastron (T) | 2315.02y | |
Semi-major axis (a) | 0.5151a | |
| Eccentricity (e) | 0.4634 | |
Inclination (i) | 59.29° | |
Longitude of periastron (ω) | 317.13° | |
| Node (Ω) | 17.64° | |
Notes | n | |
Reference | Pop1996b | |
| Equinox | 2000 | |
Last observation | 1991 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
151.6 |
0.454 |
| 2001 |
152.0 |
0.456 |
| 2002 |
152.4 |
0.459 |
| 2003 |
152.8 |
0.462 |
| 2004 |
153.2 |
0.464 |
| 2005 |
153.6 |
0.467 |
| 2006 |
154.0 |
0.470 |
| 2007 |
154.4 |
0.473 |
| 2008 |
154.8 |
0.475 |
| 2009 |
155.2 |
0.478 |
| 2010 |
155.6 |
0.480 |
| 2011 |
155.9 |
0.483 |
| 2012 |
156.3 |
0.486 |
| 2013 |
156.7 |
0.488 |
| 2014 |
157.0 |
0.491 |
| 2015 |
157.4 |
0.494 |
| 2016 |
157.8 |
0.496 |
| 2017 |
158.1 |
0.499 |
| 2018 |
158.5 |
0.501 |
| 2019 |
158.8 |
0.504 |
| 2020 |
159.1 |
0.507 |
| 2021 |
159.5 |
0.509 |
| 2022 |
159.8 |
0.512 |
| 2023 |
160.1 |
0.514 |
| 2024 |
160.5 |
0.517 |
| 2025 |
160.8 |
0.519 |
| 2026 |
161.1 |
0.522 |
| 2027 |
161.4 |
0.524 |
| 2028 |
161.8 |
0.527 |
| 2029 |
162.1 |
0.529 |
| 2030 |
162.4 |
0.532 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
