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Doubles in session

Current system

15348-2952
BUG 3

Selections

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Binocular doubles
Binary Systems
Triple Systems
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Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

15348-2952 BUG 3

15^h 34^m 49.84^s -29° 52' 27.4" P.A. 358.10 sep 0.1 mag 15.50,16.00 Sp T4.5+T5.0

Coord 2000	15348-2952		Discov num	BUG 3		Comp			Coord arcsec 2000	15 34 49.84 -29 52 27.4
Date first	2000		Date last	2015		Obs	32
Pa first	357		Pa last	194		P.A. Now (θ)	358.1°
Sep first	0.1		Sep last	0.2		Sep. Now (ρ)	0.06"
Mag pri	15.50		Mag sec	16.00		delta mag (ΔM)	0.5		Spectral class	T4.5+T5.0 (brown dwarf/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

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	194		Precise sep	0.213		Constellation	Libra		last precise pa	194
last precise sep	0.213

ORBITAL ELEMENTS

Period (P)	20.38y	± 0.06	Periastron (T)	62400d (2029.721y)	± 900	Semi-major axis (a)	213.92m	± 0.27
Eccentricity (e)	0.0058	± 0.0028	Inclination (i)	85.55°	± 0.08	Longitude of periastron (ω)	80°	± 40
Node (Ω)	13.61°	± 0.05	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox			Last observation	2015

label	rho	theta
2000	0.025	331.0
2001	0.083	2.9
2002	0.138	8.3
2003	0.181	10.8
2004	0.207	12.4
2005	0.213	13.8
2006	0.200	15.3
2007	0.168	17.1
2008	0.120	20.2
2009	0.061	28.7
2010	0.018	125.4
2011	0.073	181.3
2012	0.130	187.8
2013	0.176	190.5
2014	0.204	192.2
2015	0.214	193.7
2016	0.204	195.1
2017	0.175	196.8
2018	0.129	199.5
2019	0.073	206.1
2020	0.018	261.4
2021	0.060	358.1
2022	0.118	6.8
2023	0.166	10.0
2024	0.199	11.8
2025	0.213	13.3
2026	0.207	14.7
2027	0.182	16.3
2028	0.139	18.8
2029	0.084	24.0
2030	0.025	55.1

grafico orbita

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

wds15348-2952c.png orbit plot

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

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
15348-2952	BUG 3		2000	1	1	0.1	15.50	16.00		DK	153449.84-295227.4
15348-2952	BUG 3		2006	3	15	0.2	15.50	16.00		DK	153449.84-295227.4
15348-2952	BUG 3		2008	12	21	0.1	15.50	16.00	T5.0 T5.5	NODK	153449.84-295227.4
15348-2952	BUG 3		2009	16	39	0.0	15.50	16.00	T5.0+T5.5	NODK	153449.84-295227.4

If you need more information about this double, apply for a data request form to the WDS.