09521+5404 STT 208 (Phi UMa)
09h 52m 06.36s +54° 03' 51.4" P.A. 317.00 sep 0.5 mag 5.28,5.39 Sp A2V dist. 156.01 pc (508.9 l.y.)
Coord 2000 |
09521+5404 |
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Discov num |
STT 208 |
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Comp |
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Coord arcsec 2000 |
09 52 06.36 +54 03 51.4 |
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Date first |
1842 |
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Date last |
2022 |
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Obs |
326 |
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Pa first |
4 |
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Pa last |
316.9 |
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P.A. Now (θ) |
317.7° |
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Sep first |
0.4 |
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Sep last |
0.48 |
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Sep. Now (ρ) |
0.448" |
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Mag pri |
5.28 |
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Mag sec |
5.39 |
|
delta mag (ΔM) |
0.11 |
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Spectral class |
A2V (white) |
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Pri motion ra |
-005 |
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Sec motion ra |
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Pri motion dec |
+021 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
Phi UMa |
|
Constellation |
Ursa Major |
|
SAO |
27408 |
|
HIP |
48402 |
|
Tycho2 |
3814-01752-1 |
|
HD |
85235 |
|
HR |
3894 |
|
GC |
13559 |
|
ADS |
7545 |
|
BD |
BD+54 1331 |
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Bayer |
Phi Ursae Majoris |
|
Bayer name |
Phi UMa |
|
Flamsteed |
30 Ursae Majoris |
|
Flamsteed name |
30 UMa |
|
Distance |
156.01 |
|
Distance ly |
508.9 |
|
Bayer greek |
φ UMa |
|
ORBITAL ELEMENTS
Period (P) | 106.35y | ± 0.68 |
Periastron (T) | 1987.37y | ± 0.05 |
Semi-major axis (a) | 0.337a | ± 0.002 |
Eccentricity (e) | 0.445 | ± 0.002 |
Inclination (i) | 22.2° | ± 0.4 |
Longitude of periastron (ω) | 25.6° | ± 1.4 |
Node (Ω) | 138.9° | ± 1.8 |
Notes | n | |
Reference | Msn2021c | |
Equinox | | |
Last observation | 2019 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
259.1 |
0.260 |
2001 |
263.6 |
0.271 |
2002 |
267.8 |
0.282 |
2003 |
271.7 |
0.293 |
2004 |
275.3 |
0.303 |
2005 |
278.6 |
0.313 |
2006 |
281.8 |
0.324 |
2007 |
284.7 |
0.333 |
2008 |
287.5 |
0.343 |
2009 |
290.1 |
0.352 |
2010 |
292.6 |
0.361 |
2011 |
295.0 |
0.370 |
2012 |
297.3 |
0.378 |
2013 |
299.5 |
0.386 |
2014 |
301.6 |
0.394 |
2015 |
303.6 |
0.401 |
2016 |
305.5 |
0.408 |
2017 |
307.4 |
0.415 |
2018 |
309.3 |
0.421 |
2019 |
311.0 |
0.427 |
2020 |
312.7 |
0.433 |
2021 |
314.4 |
0.438 |
2022 |
316.1 |
0.443 |
2023 |
317.7 |
0.448 |
2024 |
319.2 |
0.452 |
2025 |
320.8 |
0.456 |
2026 |
322.3 |
0.460 |
2027 |
323.8 |
0.464 |
2028 |
325.3 |
0.467 |
2029 |
326.7 |
0.469 |
2030 |
328.2 |
0.472 |
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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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