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08122+1739
HUT 1 Ca,Cb

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

08122+1739 HUT 1 Ca,Cb

08^h 12^m 13.27^s +17° 38' 51.6" P.A. 338.00 sep 0.3 mag 6.20,7.10 Sp M1 dist. 25.08 pc (81.81 l.y.)

Coord 2000	08122+1739		Discov num	HUT 1		Comp	Ca,Cb		Coord arcsec 2000	08 12 13.27 +17 38 51.6
Date first	1982		Date last	2022		Obs	22
Pa first	241		Pa last	338.2		P.A. Now (θ)	265° (calc)
Sep first	0.3		Sep last	0.318		Sep. Now (ρ)	0.407" (calc)
Mag pri	6.20		Mag sec	7.10		delta mag (ΔM)	0.9		Spectral class	M1 (red)
Pri motion ra	+086		Sec motion ra
Pri motion dec	-091		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

08122+1739 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Tegmine	97645	08 12 13 +17 38 51	STF 1196 AB	2025	1244	349	1.1	5.30	6.25	0.95	Y
Show	Zet2 Cnc	97645	08 12 13 +17 38 51	STF 1196 AB,C	2025	576	57	6.3	4.92	5.85	0.93	Y
Show	Tegmine	97645	08 12 13 +17 38 51	STF 1196 AC	2022	650	61	6.2	5.30	5.85	0.55
Show		97645	08 12 13 +17 38 51	STF 1196 AB,D	2017	21	107	275.9	4.92	8.89	3.97
Show		97645	08 12 13 +17 38 51	ENH 1 AB,E	2007	5	26	562.2	4.92	10.08	5.16
Show		97645	08 12 13 +17 38 51	ENH 1 AB,F	2007	5	46	638.1	4.92	10.26	5.34
Show		97645	08 12 13 +17 38 51	ENH 1 AB,G	2007	5	332	672.3	4.92	10.15	5.23
Show		97645	08 12 13 +17 38 52	STF 1196 BC	2020	190	70	5.5	6.25	5.85	0.40
Show		97645	08 12 13 +17 38 52	HUT 1 Ca,Cb	2022	22	338	0.3	6.20	7.10	0.90	Y	<===
Show		97645	08 12 13 +17 38 52	OCC 9141 Ca,Cc	1998	0	-1	0.1	5.20	7.00	1.80
Show		97646	08 12 13 +17 38 52	STF 1196 CD	2000	7	107	277.5	5.85	8.89	3.04
Show			08 12 30 +17 47 14	ENH 1 EF	2015	12	106	218.7	10.08	10.26	0.18

Ninefold system
8 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Cancer		SAO	97645		HIP	40167		Tycho2	1381-01641-1
Gaia DR2	657244521593508992		HD	68256		HR	3208		GC	11142
ADS	6650		BD	BD+18 1867		Bayer	Zeta 2 Cancri		Bayer name	Zet2 Cnc
Distance	25.08		Distance ly	81.81		Bayer greek	ζ² Cnc

ORBITAL ELEMENTS

Period (P)	17.2y	± 0.019	Periastron (T)	1983.159y	± 0.149	Semi-major axis (a)	0.377a	± 0.002
Eccentricity (e)	0.101	± 0.003	Inclination (i)	144.097°	± 0.705	Longitude of periastron (ω)	342.733°	± 2.777
Node (Ω)	68.62°	± 1.188	Notes	n		Reference	JAA2023
Equinox			Last observation			Grade	2	(1=Definitive, 9=Indet.)

label	theta	rho
2000	90.6	0.327
2001	69.3	0.340
2002	48.5	0.337
2003	26.4	0.322
2004	2.3	0.310
2005	337.3	0.312
2006	314.0	0.332
2007	294.0	0.362
2008	277.1	0.391
2009	262.2	0.409
2010	248.1	0.413
2011	233.6	0.400
2012	217.6	0.372
2013	198.4	0.336
2014	174.8	0.304
2015	147.4	0.291
2016	119.7	0.302
2017	95.1	0.323
2018	73.4	0.339
2019	52.7	0.339
2020	31.0	0.325
2021	7.3	0.311
2022	342.2	0.310
2023	318.4	0.327
2024	297.7	0.356
2025	280.3	0.385
2026	265.0	0.407
2027	250.9	0.413
2028	236.6	0.404
2029	221.0	0.378
2030	202.6	0.343
2031	179.9	0.309
2032	153.0	0.292
2033	125.1	0.298
2034	99.8	0.319
2035	77.6	0.337
2036	56.9	0.340
2037	35.5	0.328
2038	12.2	0.313
2039	347.2	0.309
2040	322.9	0.322
2041	301.6	0.350
2042	283.5	0.380
2043	268.0	0.403
2044	253.7	0.413
2045	239.5	0.407
2046	224.3	0.384
2047	206.6	0.350
2048	184.8	0.315
2049	158.6	0.293
2050	130.5	0.295

grafico orbita

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

wds08122%2B1739m.png orbit plot

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