17053+5428 STF 2130 AB (Alrakis)
17h 05m 20.20s +54° 28' 14.3" P.A. 356.00 sep 2.6 mag 5.66,5.69 Sp F7V dist. 27.43 pc (89.48 l.y.)
| Coord 2000 |
17053+5428 |
|
Discov num |
STF2130 |
|
Comp |
AB |
|
Coord arcsec 2000 |
17 05 20.20 +54 28 14.3 |
|
| Date first |
1779 |
|
Date last |
2023 |
|
Obs |
836 |
|
| Pa first |
232 |
|
Pa last |
356.1 |
|
P.A. Now (θ) |
353.7° |
|
| Sep first |
4.4 |
|
Sep last |
2.62 |
|
Sep. Now (ρ) |
2.637" |
|
| Mag pri |
5.66 |
|
Mag sec |
5.69 |
|
delta mag (ΔM) |
0.03 |
|
Spectral class |
F7V (yellow-white) |
|
| Pri motion ra |
-068 |
|
Sec motion ra |
-068 |
|
| Pri motion dec |
+089 |
|
Sec motion dec |
+089 |
|
| Notes |
N
O
T
(See Notes, Orbital solution, Parallax indicates physical) |
|
This double is physical.
17053+5428 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Alrakis |
30239 |
17 05 20 +54 28 14 |
STF 2130 AB |
2023 |
836 |
356 |
2.6 |
5.66 |
5.69 |
0.03 |
Y |
<=== |
| Show |
|
30239 |
17 05 20 +54 28 14 |
BU 1088 AC |
2015 |
6 |
174 |
12.2 |
5.66 |
13.70 |
8.04 |
|
|
| Show |
|
30239 |
17 05 20 +54 28 14 |
BU 1088 BC |
2020 |
14 |
179 |
11.0 |
5.69 |
13.70 |
8.01 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Alrakis |
|
Constellation |
Draco |
|
SAO |
30239 |
|
HIP |
83608 |
|
| Tycho2 |
3890-01396-2 |
|
Gaia DR2 |
1420101696285626624 |
|
HD |
154906 |
|
HR |
6370 |
|
| GC |
23092 |
|
ADS |
10345 |
|
BD |
BD+54 1857 |
|
Bayer |
Mu Draconis |
|
| Bayer name |
Mu Dra |
|
Flamsteed |
21 Draconis |
|
Flamsteed name |
21 Dra |
|
Distance |
27.43 |
|
| Distance ly |
89.48 |
|
Bayer greek |
μ Dra |
|
| Other names |
Arrakis, Errakis |
|
ORBITAL ELEMENTS
| Period (P) | 424.2713y | ± 108.459 |
Periastron (T) | 1938.8477y | ± 10.2119 |
Semi-major axis (a) | 2.95817a | ± 0.32768 |
| Eccentricity (e) | 0.22128 | ± 0.14063 |
Inclination (i) | 146.569° | ± 3.076 |
Longitude of periastron (ω) | 31.365° | ± 8.973 |
| Node (Ω) | 128.828° | ± 14.117 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
19.2 |
2.262 |
| 2001 |
18.0 |
2.275 |
| 2002 |
16.8 |
2.288 |
| 2003 |
15.7 |
2.301 |
| 2004 |
14.6 |
2.315 |
| 2005 |
13.4 |
2.329 |
| 2006 |
12.3 |
2.343 |
| 2007 |
11.2 |
2.357 |
| 2008 |
10.2 |
2.372 |
| 2009 |
9.1 |
2.387 |
| 2010 |
8.0 |
2.402 |
| 2011 |
7.0 |
2.417 |
| 2012 |
6.0 |
2.432 |
| 2013 |
4.9 |
2.447 |
| 2014 |
3.9 |
2.463 |
| 2015 |
3.0 |
2.478 |
| 2016 |
2.0 |
2.494 |
| 2017 |
1.0 |
2.510 |
| 2018 |
0.1 |
2.525 |
| 2019 |
359.1 |
2.541 |
| 2020 |
358.2 |
2.557 |
| 2021 |
357.3 |
2.573 |
| 2022 |
356.4 |
2.589 |
| 2023 |
355.5 |
2.605 |
| 2024 |
354.6 |
2.621 |
| 2025 |
353.7 |
2.637 |
| 2026 |
352.8 |
2.654 |
| 2027 |
352.0 |
2.670 |
| 2028 |
351.1 |
2.686 |
| 2029 |
350.3 |
2.702 |
| 2030 |
349.5 |
2.718 |
| 2031 |
348.7 |
2.734 |
| 2032 |
347.9 |
2.749 |
| 2033 |
347.1 |
2.765 |
| 2034 |
346.3 |
2.781 |
| 2035 |
345.5 |
2.797 |
| 2036 |
344.7 |
2.812 |
| 2037 |
344.0 |
2.828 |
| 2038 |
343.2 |
2.843 |
| 2039 |
342.5 |
2.859 |
| 2040 |
341.8 |
2.874 |
| 2041 |
341.0 |
2.889 |
| 2042 |
340.3 |
2.904 |
| 2043 |
339.6 |
2.919 |
| 2044 |
338.9 |
2.934 |
| 2045 |
338.2 |
2.949 |
| 2046 |
337.5 |
2.963 |
| 2047 |
336.8 |
2.978 |
| 2048 |
336.1 |
2.992 |
| 2049 |
335.5 |
3.006 |
| 2050 |
334.8 |
3.020 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
|
|
