04312+5858 STI 2051 AB

Coord 2000	04312+5858		Discov num	STI2051		Comp	AB		Coord arcsec 2000	04 31 11.52 +58 58 37.5
Date first	1908		Date last	2020		Obs	111
Pa first	145		Pa last	58.6		P.A. Now (θ)	58.6°
Sep first	6.9		Sep last	10.99		Sep. Now (ρ)	10.99"
Mag pri	11.38		Mag sec	12.13		delta mag (ΔM)	0.75		Spectral class	M4.0V+DC5 (red/white dwarf)
Pri motion ra	+130		Sec motion ra	+134
Pri motion dec	-205		Sec motion dec	-196
Notes	N C P (See Notes, Has orbit and linear solution, 100-year proper motion)

rPM=0.041 (< 0.3, Physical double) This double is physical.

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SAO

coord

wds_name

last

obs

pa

sep

mag1

mag2

d_mag

orb

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04 31 12 +58 58 38

STI 2051 AB

2020

111

59

11.0

11.38

12.13

0.75

Y

<===

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04 31 12 +58 58 38

PWS 2 AC

2000

2

326

139.3

10.97

15.31

4.34

Triple system
3 estimated visually detectable stars in this system

Constellation	Camelopardalis		HIP	21088		Tycho2	3744-00412-1		GL	Gl 169.1A
Distance	5.58		Distance ly	18.2

Period (P)	1799.89y		Periastron (T)	1798.9864y		Semi-major axis (a)	32.2191a
Eccentricity (e)	0.7054		Inclination (i)	105.2509°		Longitude of periastron (ω)	333.2549°
Node (Ω)	10.3888°		Notes	n		Reference	Kpp2020f
Equinox			Last observation			Grade	5	(1=Definitive, 9=Indet.)

label theta rho 2000 245.1 8.962 2001 244.6 9.039 2002 244.1 9.116 2003 243.7 9.193 2004 243.2 9.271 2005 242.7 9.349 2006 242.3 9.428 2007 241.9 9.507 2008 241.5 9.586 2009 241.0 9.666 2010 240.6 9.746 2011 240.2 9.827 2012 239.8 9.907 2013 239.4 9.989 2014 239.0 10.070 2015 238.7 10.152 2016 238.3 10.234 2017 237.9 10.316 2018 237.6 10.398 2019 237.2 10.481 2020 236.9 10.564 2021 236.5 10.647 2022 236.2 10.730 2023 235.8 10.814 2024 235.5 10.898 2025 235.2 10.982 2026 234.9 11.066 2027 234.6 11.150 2028 234.3 11.235 2029 233.9 11.320 2030 233.6 11.404		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

Identifier	04312+5858 STI2051 A
coord_arcsec_2000	043111.52+585837.5

Period (P)	23y		Periastron (T)	1966y		Semi-major axis (a)	0.07a
Eccentricity (e)	0.3		Inclination (i)	65°		Longitude of periastron (ω)	73°
Node (Ω)	97°		Notes	n		Reference	Str1977
Equinox			Last observation	1977		Grade	9	(1=Definitive, 9=Indet.)

label theta rho 2000 324.1 0.049 2001 339.2 0.042 2002 358.4 0.038 2003 20.0 0.038 2004 39.9 0.041 2005 55.8 0.047 2006 68.0 0.054 2007 77.8 0.059 2008 86.3 0.061 2009 94.5 0.060 2010 104.1 0.053 2011 118.6 0.040 2012 151.1 0.024 2013 215.3 0.024 2014 249.9 0.039 2015 264.2 0.054 2016 272.8 0.065 2017 279.3 0.072 2018 285.1 0.074 2019 290.8 0.073 2020 297.0 0.069 2021 304.1 0.063 2022 312.8 0.056 2023 324.1 0.049 2024 339.2 0.042 2025 358.4 0.038 2026 20.0 0.038 2027 39.9 0.041 2028 55.8 0.047 2029 68.0 0.054 2030 77.8 0.059		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

discov_num	notes	refcode
STI2051	A is an astrometric binary. B (mag. 12.44, 8", DC) is a white dwarf,
	in slow retrograde motion about the mass-center. A very large proper
	proper motion brought this pair close to a 13th magnitude star which
	was measured as the C component by Pauwels & Lampens.	Pws1993
	Also known as HDS 584.
	B: Teff = 7122 +/- 122 K, R = 0.0114 +/- 0.0004 \rsun, M = 0.675 +/-	BdH2017b
	0.051 \msun.
	AB: Rectilinear solutions by Cvetkovic (2015)	Cve2015b
	and Cvetkovic et al. (2016).	Cve2016
	Despite the linear solution, based on proper motion and parallax
	is physical.

refcode	metd	author	reference
BdH2017b	not -	Bond, H.E., Bergeron, P. & Bedard, A.	2017ApJ...848...16B
BdH2017b		ApJ 848, 16, 2017
Cve2015b	orb -	Cvetkovic, Z.	2015IAUDS.187....1C
Cve2015b	+lin	Inf. Circ. 187, 1, 2015
Cve2016	C j	Cvetkovic, Z., Pavlovic, R. & Boeva, S.	2016AJ....151...58C
Cve2016	+lin	AJ 151, 58, 2016
Kpp2020f	Hg+ j	Knapp, W.R.A.	2020JDSO...16..229K
Kpp2020f	+C	JDSO 16, 229, 2020
Kpp2020f	+orb
Pws1993	Pa -	Pauwels, T. & Lampens, P.	1993BAORB..10..216P
Pws1993		Bull. R. Astron. Obs. Belgium 10, 216, 1993

idgroup	discov	author
1	STI	Stein, J. (see Vat1926)

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
04312+5858	STI2051	AB	2006	78	62	9.4	11.38	12.13		NVDP	043110.05+585855.4
04312+5858	STI2051	AB	2010	83	61	10.1	11.38	12.13		NVDP	043110.09+585855.2
04312+5858	STI2051	AB	2012	85	60	10.0	11.38	12.13	M4.0V+DC5	NVDP	043110.05+585855.4
04312+5858	STI2051	AB	2015	88	60	10.2	11.38	12.13	M4.0V+DC5	NL P	043111.52+585837.5
04312+5858	STI2051	AB	2017	99	59	10.3	11.38	12.13	M4.0V+DC5	NL P	043111.52+585837.5
04312+5858	STI2051	AB	2019	103	57	10.6	11.38	12.13	M4.0V+DC5	NLVP	043111.52+585837.5
04312+5858	STI2051	AB	2020	110	59	11.0	11.38	12.13	M4.0V+DC5	NLVP	043111.52+585837.5

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

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