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00315-6257
I 260 CD

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

00315-6257 I 260 CD

00^h 31^m 33.36^s -62° 57' 55.6" P.A. 330.00 sep 0.4 mag 4.60,6.54 Sp A2V+A7V dist. 51.65 pc (168.48 l.y.)

Coord 2000	00315-6257		Discov num	I 260		Comp	CD		Coord arcsec 2000	00 31 33.36 -62 57 55.6
Date first	1895		Date last	2021		Obs	79
Pa first	335		Pa last	330.3		P.A. Now (θ)	317.4°
Sep first	0.6		Sep last	0.405		Sep. Now (ρ)	0.462"
Mag pri	4.60		Mag sec	6.54		delta mag (ΔM)	1.94		Spectral class	A2V+A7V (white/white)
Pri motion ra	+095		Sec motion ra	+095
Pri motion dec	-049		Sec motion dec	-049
Notes	N O V (See Notes, Orbital solution, Proper motion indicates physical)

This double is physical.

00315-6257 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		248201	00 31 33 -62 57 29	B 7 AB	1932	2	153	2.6	4.36	13.50	9.14
Show	Bet1 Tuc	248201	00 31 33 -62 57 29	LCL 119 AC	2021	54	168	27.1	4.28	4.51	0.23
Show		248201	00 31 33 -62 57 29	SHY 114 AE	2000	4	118	548.9	4.28	5.07	0.79
Show		248201	00 31 33 -62 57 29	SHY 114 AF	2000	3	20	999.9	4.28	9.66	5.38
Show		248201	00 31 33 -62 57 29	SHY 114 AG	2000	3	251	999.9	4.28	7.52	3.24
Show		248202	00 31 33 -62 57 56	I 260 CD	2021	79	330	0.4	4.60	6.54	1.94	Y	<===
Show		248208	00 32 44 -63 01 53	B 8 Ea,Eb	1964	24	171	0.1	5.80	6.00	0.20
Show		248208	00 32 44 -63 01 53	SHY 116 EF	2000	4	12	999.9	5.07	9.66	4.59
Show		248208	00 32 44 -63 01 53	SHY 116 EH	2000	4	330	999.9	5.07	11.57	6.50
Show			00 34 51 -61 54 58	VSP 7 Fa,Fb	2018	2	245	0.0	7.20	7.30	0.10
Show			00 34 51 -61 54 58	SHY 113 FG	2015	4	230	999.9	9.66	7.52	2.14
Show			00 34 51 -61 54 58	SHY 117 FH	2015	4	289	999.9	9.66	11.57	1.91
Show			00 34 51 -61 54 58	SHY 117 FI	2000	3	258	999.9	9.66	11.53	1.87
Show		248159	00 18 26 -63 28 39	SHY 113 GH	2015	4	22	999.9	7.52	11.57	4.05
Show		248159	00 18 26 -63 28 39	CVN 33 GI	2006	1	233	10.2	6.15	19.60	13.45

11-fold system
9 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Tucana		SAO	248202		HIP	2487		Tycho2	8844-01520-1
Gaia DR2	4900926678262376704		HD	2885		HR	127		GC	626
Bayer	Beta 2 Tucanae		Bayer name	Bet2 Tuc		Distance	51.65		Distance ly	168.48
Bayer greek	β² Tuc

ORBITAL ELEMENTS

Period (P)	44.73y	± 0.34	Periastron (T)	2011.62y	± 0.01	Semi-major axis (a)	0.495a	± 0.001
Eccentricity (e)	0.81	± 0.001	Inclination (i)	124.7°	± 0.3	Longitude of periastron (ω)	112.2°	± 0.2
Node (Ω)	241.6°	± 0.2	Notes	n		Reference	Tok2015c
Equinox	2000		Last observation	2014		Grade	2	(1=Definitive, 9=Indet.)

label	theta	rho
2000	276.1	0.580
2001	274.1	0.568
2002	272.0	0.553
2003	269.8	0.535
2004	267.4	0.512
2005	264.8	0.486
2006	261.8	0.453
2007	258.3	0.414
2008	253.9	0.365
2009	248.0	0.303
2010	238.4	0.221
2011	210.3	0.102
2012	75.0	0.103
2013	41.7	0.179
2014	25.0	0.218
2015	12.9	0.248
2016	3.2	0.273
2017	355.1	0.297
2018	348.1	0.320
2019	342.1	0.342
2020	336.8	0.364
2021	332.1	0.385
2022	327.9	0.405
2023	324.1	0.425
2024	320.6	0.444
2025	317.4	0.462
2026	314.4	0.479
2027	311.7	0.496
2028	309.1	0.511
2029	306.6	0.525
2030	304.3	0.539
2031	302.1	0.551
2032	300.0	0.562
2033	297.9	0.572
2034	295.9	0.581
2035	294.0	0.589
2036	292.1	0.595
2037	290.3	0.600
2038	288.5	0.603
2039	286.7	0.605
2040	284.9	0.605
2041	283.1	0.604
2042	281.3	0.600
2043	279.4	0.595
2044	277.5	0.587
2045	275.6	0.577
2046	273.6	0.564
2047	271.4	0.548
2048	269.2	0.529
2049	266.7	0.506
2050	264.0	0.477

grafico orbita

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

wds00315-6257b.png orbit plot

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