18253+4846 HU 66 BC
18h 25m 18.20s +48° 45' 42.5" P.A. 26.00 sep 0.8 mag 8.40,8.25 Sp G5 dist. 144.72 pc (472.08 l.y.)
| Coord 2000 |
18253+4846 |
|
Discov num |
HU 66 |
|
Comp |
BC |
|
Coord arcsec 2000 |
18 25 18.20 +48 45 42.5 |
|
| Date first |
1898 |
|
Date last |
2019 |
|
Obs |
20 |
|
| Pa first |
223 |
|
Pa last |
25.5 |
|
P.A. Now (θ) |
25.5° |
|
| Sep first |
0.5 |
|
Sep last |
0.831 |
|
Sep. Now (ρ) |
0.831" |
|
| Mag pri |
8.40 |
|
Mag sec |
8.25 |
|
delta mag (ΔM) |
0.15 |
|
Spectral class |
G5 (yellow) |
|
| Pri motion ra |
+019 |
|
Sec motion ra |
+019 |
|
| Pri motion dec |
+003 |
|
Sec motion dec |
+004 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
rPM=0.052 (< 0.3, Physical double)
This double is physical.
18253+4846 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
47482 |
18 25 18 +48 45 42 |
HU 66 AB |
2016 |
65 |
197 |
0.2 |
7.90 |
8.40 |
0.50 |
Y |
|
| Show |
HD 170109 |
47482 |
18 25 18 +48 45 42 |
STT 351 AC |
2021 |
102 |
26 |
1.0 |
7.90 |
8.25 |
0.35 |
Y |
|
| Show |
|
|
18 25 18 +48 45 42 |
HU 66 BC |
2019 |
20 |
26 |
0.8 |
8.40 |
8.25 |
0.15 |
Y |
<=== |
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Draco |
|
HIP |
90284 |
|
Tycho2 |
3534-00302-1 |
|
Gaia DR2 |
2123486226905640960 |
|
| HD |
170109 |
|
ADS |
11344 |
|
BD |
BD+48 2692 |
|
Distance |
144.72 |
|
| Distance ly |
472.08 |
|
ORBITAL ELEMENTS
| Period (P) | 1378.1389y | ± 1224.5787 |
Periastron (T) | 1957.4254y | ± 77.6647 |
Semi-major axis (a) | 1.843a | ± 1.25545 |
| Eccentricity (e) | 0.49722 | ± 0.42039 |
Inclination (i) | 100.869° | ± 8.774 |
Longitude of periastron (ω) | 347.155° | ± 78.575 |
| Node (Ω) | 33.576° | ± 13.634 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
28.9 |
0.911 |
| 2001 |
28.7 |
0.908 |
| 2002 |
28.5 |
0.906 |
| 2003 |
28.3 |
0.903 |
| 2004 |
28.2 |
0.900 |
| 2005 |
28.0 |
0.897 |
| 2006 |
27.8 |
0.894 |
| 2007 |
27.6 |
0.890 |
| 2008 |
27.4 |
0.887 |
| 2009 |
27.2 |
0.883 |
| 2010 |
27.1 |
0.880 |
| 2011 |
26.9 |
0.876 |
| 2012 |
26.7 |
0.872 |
| 2013 |
26.5 |
0.868 |
| 2014 |
26.3 |
0.864 |
| 2015 |
26.1 |
0.860 |
| 2016 |
25.9 |
0.856 |
| 2017 |
25.7 |
0.852 |
| 2018 |
25.5 |
0.848 |
| 2019 |
25.3 |
0.843 |
| 2020 |
25.1 |
0.839 |
| 2021 |
24.9 |
0.834 |
| 2022 |
24.7 |
0.829 |
| 2023 |
24.5 |
0.825 |
| 2024 |
24.2 |
0.820 |
| 2025 |
24.0 |
0.815 |
| 2026 |
23.8 |
0.810 |
| 2027 |
23.6 |
0.805 |
| 2028 |
23.4 |
0.800 |
| 2029 |
23.1 |
0.795 |
| 2030 |
22.9 |
0.789 |
|
|
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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