04242-5704 RMK 4 (HD 28255)
04h 24m 12.21s -57° 04' 16.8" P.A. 248.00 sep 5.3 mag 6.87,7.23 Sp G4V dist. 27.7 pc (90.36 l.y.)
Coord 2000 |
04242-5704 |
|
Discov num |
RMK 4 |
|
Comp |
|
|
Coord arcsec 2000 |
04 24 12.21 -57 04 16.8 |
|
Date first |
1834 |
|
Date last |
2015 |
|
Obs |
55 |
|
Pa first |
226 |
|
Pa last |
248.3 |
|
P.A. Now (θ) |
248.3° |
|
Sep first |
5.0 |
|
Sep last |
5.34 |
|
Sep. Now (ρ) |
5.34" |
|
Mag pri |
6.87 |
|
Mag sec |
7.23 |
|
delta mag (ΔM) |
0.36 |
|
Spectral class |
G4V (yellow) |
|
Pri motion ra |
-104 |
|
Sec motion ra |
-100 |
|
Pri motion dec |
-074 |
|
Sec motion dec |
-060 |
|
Notes |
C
(Has orbit and linear solution) |
|
rPM=0.114 (< 0.3, Physical double)
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 28255 |
|
Constellation |
Dorado |
|
SAO |
233506 |
|
HIP |
20552 |
|
Tycho2 |
8505-01902-1 |
|
Gaia DR2 |
4775347916201249792 |
|
HD |
28255 |
|
HR |
1405 |
|
GC |
5366 |
|
GL |
Wo 9155A |
|
CP |
CP-57 659 |
|
Distance |
27.7 |
|
Distance ly |
90.36 |
|
ORBITAL ELEMENTS
Period (P) | 2400y | ± 400 |
Periastron (T) | 1900y | ± 110 |
Semi-major axis (a) | 8a | ± 1.1 |
Eccentricity (e) | 0.22 | ± 0.05 |
Inclination (i) | 70° | ± 2 |
Longitude of periastron (ω) | 200° | ± 30 |
Node (Ω) | 54.9° | ± 0.7 |
Notes | | |
Reference | LRR2018b | |
Equinox | 2000 | |
Last observation | 2015 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
253.1 |
4.814 |
2001 |
253.2 |
4.800 |
2002 |
253.3 |
4.786 |
2003 |
253.5 |
4.773 |
2004 |
253.6 |
4.759 |
2005 |
253.8 |
4.745 |
2006 |
253.9 |
4.732 |
2007 |
254.0 |
4.718 |
2008 |
254.2 |
4.704 |
2009 |
254.3 |
4.690 |
2010 |
254.5 |
4.676 |
2011 |
254.6 |
4.662 |
2012 |
254.8 |
4.649 |
2013 |
254.9 |
4.635 |
2014 |
255.1 |
4.621 |
2015 |
255.2 |
4.607 |
2016 |
255.4 |
4.592 |
2017 |
255.5 |
4.578 |
2018 |
255.7 |
4.564 |
2019 |
255.8 |
4.550 |
2020 |
256.0 |
4.536 |
2021 |
256.1 |
4.522 |
2022 |
256.3 |
4.507 |
2023 |
256.5 |
4.493 |
2024 |
256.6 |
4.479 |
2025 |
256.8 |
4.465 |
2026 |
256.9 |
4.450 |
2027 |
257.1 |
4.436 |
2028 |
257.3 |
4.421 |
2029 |
257.4 |
4.407 |
2030 |
257.6 |
4.393 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|