18208+7120 STT 353 AB (Phi Dra)
18h 20m 45.44s +71° 20' 15.8" P.A. 262.00 sep 0.5 mag 4.46,5.90 Sp B7V+B9V dist. 92.85 pc (302.88 l.y.)
| Coord 2000 |
18208+7120 |
|
Discov num |
STT 353 |
|
Comp |
AB |
|
Coord arcsec 2000 |
18 20 45.44 +71 20 15.8 |
|
| Date first |
1843 |
|
Date last |
2021 |
|
Obs |
95 |
|
| Pa first |
69 |
|
Pa last |
261.8 |
|
P.A. Now (θ) |
264.3° |
|
| Sep first |
0.6 |
|
Sep last |
0.46 |
|
Sep. Now (ρ) |
0.565" |
|
| Mag pri |
4.46 |
|
Mag sec |
5.90 |
|
delta mag (ΔM) |
1.44 |
|
Spectral class |
B7V+B9V (blue-white/blue-white) |
|
| Pri motion ra |
-005 |
|
Sec motion ra |
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|
| Pri motion dec |
+036 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
18208+7120 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Phi Dra |
9084 |
18 20 45 +71 20 16 |
STT 353 AB |
2021 |
95 |
262 |
0.5 |
4.46 |
5.90 |
1.44 |
Y |
<=== |
| Show |
|
9084 |
18 20 45 +71 20 16 |
STT 353 AB,C |
2007 |
5 |
117 |
72.5 |
4.21 |
12.70 |
8.49 |
|
|
Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
Phi Dra |
|
Constellation |
Draco |
|
SAO |
9084 |
|
HIP |
89908 |
|
| Tycho2 |
4437-01492-1 |
|
HD |
170000 |
|
HR |
6920 |
|
GC |
25114 |
|
| ADS |
11311 |
|
BD |
BD+71 889 |
|
Bayer |
Phi Draconis |
|
Bayer name |
Phi Dra |
|
| Flamsteed |
43 Draconis |
|
Flamsteed name |
43 Dra |
|
Distance |
92.85 |
|
Distance ly |
302.88 |
|
| Bayer greek |
φ Dra |
|
ORBITAL ELEMENTS
| Period (P) | 307.8y | |
Periastron (T) | 2116.6y | |
Semi-major axis (a) | 0.965a | |
| Eccentricity (e) | 0.752 | |
Inclination (i) | 95.6° | |
Longitude of periastron (ω) | 275° | |
| Node (Ω) | 70.3° | |
Notes | n | |
Reference | Ana2005 | |
| Equinox | 2000 | |
Last observation | 1998 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
270.8 |
0.437 |
| 2001 |
270.4 |
0.443 |
| 2002 |
270.1 |
0.449 |
| 2003 |
269.7 |
0.455 |
| 2004 |
269.4 |
0.461 |
| 2005 |
269.1 |
0.467 |
| 2006 |
268.8 |
0.472 |
| 2007 |
268.4 |
0.478 |
| 2008 |
268.1 |
0.484 |
| 2009 |
267.8 |
0.490 |
| 2010 |
267.6 |
0.495 |
| 2011 |
267.3 |
0.501 |
| 2012 |
267.0 |
0.506 |
| 2013 |
266.7 |
0.512 |
| 2014 |
266.5 |
0.518 |
| 2015 |
266.2 |
0.523 |
| 2016 |
266.0 |
0.528 |
| 2017 |
265.7 |
0.534 |
| 2018 |
265.5 |
0.539 |
| 2019 |
265.2 |
0.544 |
| 2020 |
265.0 |
0.550 |
| 2021 |
264.8 |
0.555 |
| 2022 |
264.5 |
0.560 |
| 2023 |
264.3 |
0.565 |
| 2024 |
264.1 |
0.570 |
| 2025 |
263.9 |
0.575 |
| 2026 |
263.7 |
0.580 |
| 2027 |
263.5 |
0.585 |
| 2028 |
263.3 |
0.590 |
| 2029 |
263.1 |
0.595 |
| 2030 |
262.9 |
0.599 |
|
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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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