20526-1609 SPF 2

20^h 52^m 35.31^s -16° 09' 29.8" P.A. 124.00 sep 0.1 mag 15.57,16.30 Sp L6.0+T2.0

Coord 2000	20526-1609	Discov num	SPF 2	Comp		Coord arcsec 2000	20 52 35.31 -16 09 29.8
Date first	2005	Date last	2014	Obs	18
Pa first	13	Pa last	124	P.A. Now (θ)	124°
Sep first	0.1	Sep last	0.146	Sep. Now (ρ)	0.146"
Mag pri	15.57	Mag sec	16.30	delta mag (ΔM)	0.73	Spectral class	L6.0+T2.0 (very deep red/brown dwarf)
Pri motion ra		Sec motion ra
Pri motion dec		Sec motion dec
Notes	N O K (See Notes, Orbital solution, K-band or other infrared magnitudes)

Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Constellation

Capricornus

ORBITAL ELEMENTS

Period (P)	32y	Periastron (T)	53654.31d (2005.776y)	Semi-major axis (a)	0.147a
Eccentricity (e)	0.005	Inclination (i)	45°	Longitude of periastron (ω)	98°
Node (Ω)	327°	Notes	n	Reference	BGg2015
Equinox	2000	Last observation	2010	Grade	5	(1=Definitive, 9=Indet.)

label	theta	rho
2000	351.2	0.136
2001	1.1	0.128
2002	12.4	0.119
2003	25.4	0.111
2004	40.0	0.106
2005	55.8	0.103
2006	71.7	0.105
2007	86.6	0.110
2008	99.9	0.118
2009	111.4	0.127
2010	121.5	0.135
2011	130.5	0.141
2012	138.9	0.145
2013	146.9	0.147
2014	154.9	0.146
2015	163.2	0.142
2016	172.1	0.136
2017	182.0	0.128
2018	193.2	0.120
2019	206.1	0.112
2020	220.6	0.107
2021	236.1	0.104
2022	251.7	0.106
2023	266.3	0.111
2024	279.3	0.119
2025	290.7	0.127
2026	300.7	0.135
2027	309.7	0.141
2028	318.1	0.146
2029	326.1	0.147
2030	334.1	0.146

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

Measures: green=micrometric, blue=interferometric, purple=photographic

WDS 20526-1609 SPF 2 : NOTES

discov_num	notes	refcode
SPF 2	Stumpf et al. (2011) estimate the period at 21 +/- 1 yr and the system	Spf2011
	mass at > 78 Mjup. Near-IR colors suggest spectral types T1 +1/-4 and
	T2.5 +/- 1.
	SDSS J205235.31-160929.8. Bardalez Gagliuffi et al. (2015) derive a
	preliminary orbit for this very low-mass binary, deriving a system
	mass of 0.0823 +0.0037/-0.0027 Msun and spectral types L6.0 +/- 2.0
	and T2.0 +/- 0.05. (Note: the quoted 2453654.31 Julian date for tau_0
	does not appear to correspond to the best-fit T0. To was adjusted to
	2455054.31 for the orbit catalog figure.)	BGg2015

REFERENCES

refcode	metd	author	reference
BGg2015	A j	Bardalez Gagliuffi, D.C., Gelino, C.R., & Burgasser, A.J.	2015AJ....150..163B
BGg2015	+Ag	AJ 150, 163, 2015
Spf2011	A j	Stumpf, M.B., Geissler, K., Bouy, H., Brandner, W., Goldman, B., & Henning, Th.	2011A&A...525A.123S
Spf2011	+Hn	A&A 525, A123, 2011

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20526-1609	SPF 2		2009	2	67	0.1	15.57	16.30	T1 T2.5	N DK	205235.31-160929.8
20526-1609	SPF 2		2010	6	79	0.1	15.57	16.30	L6.0+T2.0	NO K	205235.31-160929.8
20526-1609	SPF 2		2014	17	124	0.1	15.57	16.30	L6.0+T2.0	NO K	205235.31-160929.8

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WDS 20526-1609 SPF 2 : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 20526-1609 SPF 2 : MEASURES

No records found.

WDS 20526-1609 : VIRTUAL EYEPIECE

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WDS 20526-1609 : ALADIN DSS IMAGE @ 20^h 52^m 35.31^s -16° 09' 29.8"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 20526-1609 SPF 2 : NEIGHBORHOODS

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Pass over with the mouse cursor to display the catalog designation.

Show	name	coord_2000	discov#	comp	pa	sep	dist(')
Show		20526-1609	SPF 2		124	0.1
Show		20528-1610	BU 154		61	3.0	4
Show		20519-1631	HJ 3001		241	6.6	24
Show		20557-1625	DAM 219		117	8.2	48
Show		20557-1547	GWP3018		249	15.2	51
Show		20494-1638	RST3269		71	2.1	54
Show		20538-1516	UC 4320		156	10.3	57
Show		20537-1711	GWP3014		264	9.5	64
Show		20550-1705	SKF2092		68	8.3	66
Show		20533-1719	HLD 42		44	1.3	71
Show		20571-1539	SKF2093		197	16.6	72
Show		20558-1707	JAY 1	AB	324	1.1	74
Show		20558-1707	TOK 343	AC	138	324.9	74
Show		20477-1542	OCC1007		-1	0.1	76
Show		20558-1707	JAY 2	CD	141	2.2	79
Show		20465-1642	SKI 11		289	3.9	94
Show		20468-1655	ARN 110		90	59.4	96
Show		20593-1628	SKF2095			14.4	99
Show		20464-1653	HU 271		100	0.3	99
Show		20571-1453	TVB 318		49	16.0	101
Show		20569-1731	OCC 351		-1	0.2	103
Show		20595-1653	UC 4353		143	15.1	108
Show		20452-1548	OCC 290		-1	0.1	109
Show		20530-1416	HU 272		184	3.5	114
Show		21008-1606	GWP3028		345	14.1	119
Show		20493-1802	HJ 3000		251	33.4	122
Show		20578-1749	DVG 47		343	41.2	125
Show		21002-1507	OCC1006		-1	0.1	127
Show		21006-1705	HO 461		229	3.0	128
Show		20439-1646	RST3268		119	1.7	131
Show		21016-1626	OCC1016		-1	0.1	131
Show		20587-1429	OCC 19	AB	-1	0.1	134
Show		20587-1429	SKF2094	AC	118	129.0	134
Show		20448-1458	OCC 20	AB	-1	0.1	135
Show		20448-1458	OCC 20	AC	-1	0.1	135
Show		20555-1400	LDS6418	AB	185	107.3	135
Show		20555-1400	TSN 195	Aa,Ab	190	0.1	135
Show		21001-1449	RST4072		142	1.9	136
Show		20444-1503	HJ 1567		344	30.6	136
Show		20484-1812	OCC9211	EF	46	0.6	137
Show		20484-1812	S 763	AB	293	15.8	137
Show		20484-1812	S 763	AC	177	542.3	137
Show		20433-1701	RST3267		217	1.4	144
Show		20484-1812	S 763	CD	333	9.1	145
Show		21009-1732	OCC 607		-1	-1.0	145
Show		20599-1750	ALD 120		120	3.7	146
Show		21025-1544	GWP3030		37	56.1	146
Show		21006-1740	HLD 165		172	8.2	146
Show		21026-1528	OCC1013		-1	0.0	150
Show		20518-1336	BRT2777		333	3.5	155
Show		20452-1809	GWP2992		114	100.8	160

WDS 20526-1609 : COMPONENTS

	A
B	pa=125.1° sep=0.14"

20526-1609 A

Componente originario normalizzato

Coord arcsec 2000

205235.31-160929.8

Mag

15.57

Spectral class

L6.0 (very deep red)

20526-1609 B

Componente originario normalizzato	AB		Coord arcsec 2000	205235.32-160929.9		Mag	16.3		Spectral class	T2.0 (brown dwarf)
Calc delta mag	0.73		Calc coord	yes