00028+0208 BU  281AB

Coord 2000	00028+0208		Discov num	BU  281		Comp	AB		Coord arcsec 2000	00 02 47.14 +02 07 49.4
Date first	1877		Date last	2017		Obs	71
Pa first	217		Pa last	159		P.A. Now (θ)	158.2°
Sep first	1.1		Sep last	1.6		Sep. Now (ρ)	1.54"
Mag pri	7.40		Mag sec	9.36		delta mag (ΔM)	1.96		Spectral class	F2V (yellow-white)
Pri motion ra	+062		Sec motion ra	+062
Pri motion dec	-094		Sec motion dec	-094
Notes	N O (See Notes, Orbital solution)

This double is physical.

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name

SAO

coord

wds_name

last

obs

pa

sep

mag1

mag2

d_mag

orb

current

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00 02 47 +02 07 49

BU 281 AB

2017

71

158

1.5

7.40

9.36

1.96

Y

<===

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00 02 47 +02 07 49

HJ 998 AC

2016

20

329

46.3

7.40

12.38

4.98

Triple system
3 visible stars in this system

Precise pa	159.4		Precise sep	1.585		Constellation	Pisces		HIP	223
Tycho2	0001-00903-1		Gaia DR2	2739059700184753280		HD	225028		ADS	9
BD	BD+01 4820		Distance	42.63		Distance ly	139.06		last precise pa	159.4
last precise sep	1.585

Period (P)	1117y		Periastron (T)	2077.5y		Semi-major axis (a)	3.14a
Eccentricity (e)	0.639		Inclination (i)	108.5°		Longitude of periastron (ω)	55.7°
Node (Ω)	149.9°		Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2014

label rho theta 2000 1.572 164.9 2001 1.573 164.6 2002 1.573 164.3 2003 1.573 164.0 2004 1.573 163.6 2005 1.573 163.3 2006 1.573 163.0 2007 1.572 162.7 2008 1.571 162.4 2009 1.570 162.1 2010 1.569 161.8 2011 1.568 161.4 2012 1.566 161.1 2013 1.564 160.8 2014 1.562 160.5 2015 1.560 160.2 2016 1.558 159.9 2017 1.555 159.5 2018 1.552 159.2 2019 1.549 158.9 2020 1.546 158.6 2021 1.542 158.2 2022 1.538 157.9 2023 1.534 157.6 2024 1.529 157.3 2025 1.524 156.9 2026 1.519 156.6 2027 1.514 156.2 2028 1.508 155.9 2029 1.502 155.6 2030 1.496 155.2		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
00028+0208	BU 281	AB	2006	59	163	1.6	7.40	9.36	F2V	D	000247.14+020749.4
00028+0208	BU 281	AB	2008	64	163	1.6	7.40	9.36	F2V	D	000247.14+020749.4
00028+0208	BU 281	AB	2012	65	162	1.6	7.40	9.36	F2V	N D	000247.14+020749.4
00028+0208	BU 281	AB	2014	67	160	1.6	7.40	9.36	F2V	NU	000247.14+020749.4
00028+0208	BU 281	AB	2015	68	160	1.6	7.40	9.36	F2V	NO	000247.14+020749.4
00028+0208	BU 281	AB	2017	69	159	1.6	7.40	9.36	F2V	NO	000247.14+020749.4

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