16054-1948 BU 947 AB
16h 05m 26.23s -19° 48' 19.4" P.A. 219.00 sep 0.3 mag 2.62,10.60 Sp B0.5V dist. 123.92 pc (404.23 l.y.)
| Coord 2000 |
16054-1948 |
|
Discov num |
BU 947 |
|
Comp |
AB |
|
Coord arcsec 2000 |
16 05 26.23 -19 48 19.4 |
|
| Date first |
1879 |
|
Date last |
2021 |
|
Obs |
46 |
|
| Pa first |
89 |
|
Pa last |
219 |
|
P.A. Now (θ) |
219° |
|
| Sep first |
0.8 |
|
Sep last |
0.325 |
|
Sep. Now (ρ) |
0.325" |
|
| Mag pri |
2.62 |
|
Mag sec |
10.60 |
|
delta mag (ΔM) |
7.98 |
|
Spectral class |
B0.5V (blue-white) |
|
| Pri motion ra |
-007 |
|
Sec motion ra |
|
|
| Pri motion dec |
-025 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
16054-1948 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
159682 |
16 05 26 -19 48 19 |
OCC 9158 Aa,Ab |
1976 |
0 |
-1 |
0.0 |
2.90 |
4.10 |
1.20 |
Y |
|
| Show |
|
159682 |
16 05 26 -19 48 19 |
BU 947 AB |
2021 |
46 |
219 |
0.3 |
2.62 |
10.60 |
7.98 |
Y |
<=== |
| Show |
Acrab |
159682 |
16 05 26 -19 48 19 |
H 3 7 AC |
2019 |
142 |
20 |
13.4 |
2.59 |
4.52 |
1.93 |
|
|
| Show |
|
159682 |
16 05 26 -19 48 19 |
PWL 9001 AD |
1998 |
3 |
30 |
518.2 |
2.62 |
7.50 |
4.88 |
|
|
| Show |
|
159683 |
16 05 27 -19 48 07 |
MCA 42 CE |
2021 |
30 |
61 |
0.1 |
4.52 |
6.60 |
2.08 |
Y |
|
Sextuple system
5 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Acrab |
|
Var name |
NSV7424 Sco |
|
Constellation |
Scorpius |
|
SAO |
159682 |
|
| HIP |
78820 |
|
Tycho2 |
6208-01623-1 |
|
Gaia DR2 |
6247207266936828288 |
|
HD |
144217 |
|
| HR |
5984 |
|
GC |
21609 |
|
ADS |
9913 |
|
BD |
BD-19 4307 |
|
| CP |
CP-19 5945 |
|
Bayer |
Beta 1 Scorpii |
|
Bayer name |
Bet1 Sco |
|
Flamsteed |
8 Scorpii |
|
| Flamsteed name |
8 Sco |
|
FK5 |
597 |
|
Distance |
123.92 |
|
Distance ly |
404.23 |
|
| Bayer greek |
β1 Sco |
|
| Other names |
Graffias, Grafias, Akrab, Elacrab |
|
ORBITAL ELEMENTS
| Period (P) | 635y | |
Periastron (T) | 2619.3y | |
Semi-major axis (a) | 0.988a | |
| Eccentricity (e) | 0.325 | |
Inclination (i) | 66.2° | |
Longitude of periastron (ω) | 62.8° | |
| Node (Ω) | 96.4° | |
Notes | n | |
Reference | Tok2017c | |
| Equinox | 2000 | |
Last observation | 2017 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
165.2 |
0.289 |
| 2001 |
167.8 |
0.285 |
| 2002 |
170.4 |
0.283 |
| 2003 |
173.1 |
0.280 |
| 2004 |
175.8 |
0.278 |
| 2005 |
178.5 |
0.277 |
| 2006 |
181.3 |
0.276 |
| 2007 |
184.1 |
0.276 |
| 2008 |
186.8 |
0.277 |
| 2009 |
189.6 |
0.278 |
| 2010 |
192.3 |
0.279 |
| 2011 |
195.0 |
0.281 |
| 2012 |
197.6 |
0.284 |
| 2013 |
200.2 |
0.287 |
| 2014 |
202.8 |
0.291 |
| 2015 |
205.2 |
0.295 |
| 2016 |
207.6 |
0.299 |
| 2017 |
209.9 |
0.304 |
| 2018 |
212.2 |
0.310 |
| 2019 |
214.3 |
0.315 |
| 2020 |
216.4 |
0.321 |
| 2021 |
218.4 |
0.328 |
| 2022 |
220.4 |
0.335 |
| 2023 |
222.2 |
0.342 |
| 2024 |
224.0 |
0.349 |
| 2025 |
225.7 |
0.356 |
| 2026 |
227.3 |
0.364 |
| 2027 |
228.9 |
0.372 |
| 2028 |
230.4 |
0.380 |
| 2029 |
231.8 |
0.388 |
| 2030 |
233.2 |
0.396 |
|
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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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