02409+0452 STT 45 (HD 16721)
02h 40m 56.61s +04° 52' 14.6" P.A. 257.00 sep 0.8 mag 7.39,8.95 Sp F0
| Coord 2000 |
02409+0452 |
|
Discov num |
STT 45 |
|
Comp |
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Coord arcsec 2000 |
02 40 56.61 +04 52 14.6 |
|
| Date first |
1844 |
|
Date last |
2018 |
|
Obs |
46 |
|
| Pa first |
298 |
|
Pa last |
256.8 |
|
P.A. Now (θ) |
256.8° |
|
| Sep first |
1.5 |
|
Sep last |
0.829 |
|
Sep. Now (ρ) |
0.829" |
|
| Mag pri |
7.39 |
|
Mag sec |
8.95 |
|
delta mag (ΔM) |
1.56 |
|
Spectral class |
F0 (yellow-white) |
|
| Pri motion ra |
+004 |
|
Sec motion ra |
+004 |
|
| Pri motion dec |
-016 |
|
Sec motion dec |
-016 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 16721 |
|
Constellation |
Cetus |
|
SAO |
110680 |
|
Tycho2 |
0050-00606-1 |
|
| Gaia DR2 |
5972070421280128 |
|
HD |
16721 |
|
ADS |
2043 |
|
ORBITAL ELEMENTS
| Period (P) | 1207.383y | ± 611.609 |
Periastron (T) | 1802.628y | ± 58.1814 |
Semi-major axis (a) | 5.26971a | ± 3.6158 |
| Eccentricity (e) | 0.87373 | ± 0.11611 |
Inclination (i) | 94.561° | ± 6.534 |
Longitude of periastron (ω) | 105.852° | ± 23.086 |
| Node (Ω) | 123.515° | ± 4.687 |
Notes | | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2008 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
266.3 |
0.863 |
| 2001 |
265.9 |
0.857 |
| 2002 |
265.4 |
0.851 |
| 2003 |
265.0 |
0.845 |
| 2004 |
264.5 |
0.840 |
| 2005 |
264.1 |
0.834 |
| 2006 |
263.6 |
0.828 |
| 2007 |
263.2 |
0.822 |
| 2008 |
262.7 |
0.817 |
| 2009 |
262.2 |
0.811 |
| 2010 |
261.7 |
0.805 |
| 2011 |
261.2 |
0.800 |
| 2012 |
260.7 |
0.794 |
| 2013 |
260.2 |
0.789 |
| 2014 |
259.7 |
0.784 |
| 2015 |
259.1 |
0.778 |
| 2016 |
258.6 |
0.773 |
| 2017 |
258.1 |
0.768 |
| 2018 |
257.5 |
0.763 |
| 2019 |
257.0 |
0.757 |
| 2020 |
256.4 |
0.752 |
| 2021 |
255.8 |
0.748 |
| 2022 |
255.3 |
0.743 |
| 2023 |
254.7 |
0.738 |
| 2024 |
254.1 |
0.733 |
| 2025 |
253.5 |
0.728 |
| 2026 |
252.9 |
0.724 |
| 2027 |
252.3 |
0.719 |
| 2028 |
251.6 |
0.715 |
| 2029 |
251.0 |
0.710 |
| 2030 |
250.4 |
0.706 |
|
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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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