08122+1739 STF 1196 AB (Tegmine)

08^h 12^m 12.79^s +17° 38' 51.2" P.A. 359.00 sep 1.1 mag 5.30,6.25 Sp F8V dist. 25.08 pc (81.81 l.y.)

Coord 2000	08122+1739		Discov num	STF1196		Comp	AB		Coord arcsec 2000	08 12 12.79 +17 38 51.2
Date first	1825		Date last	2022		Obs	1230
Pa first	58		Pa last	359.2		P.A. Now (θ)	354°
Sep first	1.1		Sep last	1.134		Sep. Now (ρ)	1.098"
Mag pri	5.30		Mag sec	6.25		delta mag (ΔM)	0.95		Spectral class	F8V (yellow-white)
Pri motion ra	+080		Sec motion ra	+080
Pri motion dec	-129		Sec motion dec	-129
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	2022	1230	359	1.1	5.30	6.25	0.95	Y	<===
Show	Zet2 Cnc	97646	08 12 13 +17 38 51	STF 1196 AB,C	2020	575	64	6.0	4.92	5.85	0.93	Y
Show	Tegmine	97646	08 12 13 +17 38 51	STF 1196 AC	2022	643	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	187	70	5.5	6.25	5.85	0.40
Show		97646	08 12 13 +17 38 52	HUT 1 Ca,Cb	2021	21	344	0.3	6.20	7.10	0.90	Y
Show		97646	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

Common name	Tegmine		Constellation	Cancer		SAO	97645		HIP	40167
Tycho2	1381-01638-1		Gaia DR2	657244521593509376		HD	68255		HR	3208
GC	11142		ADS	6650		BD	BD+18 1867		Bayer	Zeta 2 Cancri
Bayer name	Zet2 Cnc		Flamsteed	16 Cancri		Flamsteed name	16 Cnc		Distance	25.08
Distance ly	81.81		Bayer greek	ζ² Cnc

ORBITAL ELEMENTS

Period (P)	59.4252y	± 0.0658	Periastron (T)	1929.5282y	± 0.0775	Semi-major axis (a)	0.85272a	± 0.00334
Eccentricity (e)	0.31435	± 0.00183	Inclination (i)	173.574°	± 2.66	Longitude of periastron (ω)	239.232°	± 26.195
Node (Ω)	67.744°	± 26.034	Notes	n		Reference	Izm2019
Equinox			Last observation	2015		Grade	1	(1=Definitive, 9=Indet.)

label	theta	rho
2000	85.0	0.828
2001	79.2	0.857
2002	73.7	0.885
2003	68.6	0.912
2004	63.7	0.937
2005	59.1	0.960
2006	54.7	0.982
2007	50.5	1.003
2008	46.4	1.022
2009	42.5	1.039
2010	38.7	1.054
2011	35.0	1.068
2012	31.4	1.080
2013	27.9	1.090
2014	24.4	1.099
2015	21.0	1.105
2016	17.6	1.110
2017	14.2	1.114
2018	10.9	1.115
2019	7.6	1.115
2020	4.2	1.114
2021	0.9	1.110
2022	357.5	1.105
2023	354.0	1.098
2024	350.6	1.090
2025	347.0	1.079
2026	343.4	1.068
2027	339.7	1.054
2028	335.9	1.039
2029	332.0	1.022
2030	328.0	1.004

grafico orbita

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

wds08122%2B1739h.png orbit plot

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