08122+1739 STF 1196 AB,C (Zet2 Cnc)

Coord 2000	08122+1739		Discov num	STF1196		Comp	AB,C		Coord arcsec 2000	08 12 12.79 +17 38 51.2
Date first	1780		Date last	2025		Obs	576
Pa first	178		Pa last	57.1		P.A. Now (θ)	57.1°
Sep first	8.0		Sep last	6.33		Sep. Now (ρ)	6.33"
Mag pri	4.92		Mag sec	5.85		delta mag (ΔM)	0.93		Spectral class	F8V (yellow-white)
Pri motion ra	+080		Sec motion ra	+086
Pri motion dec	-129		Sec motion dec	-091
Notes	N O (See Notes, Orbital solution)

rPM=0.253 (< 0.3, Physical double) This double is physical.

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

Name	Zet2 Cnc		Constellation	Cancer		SAO	97645		HIP	40167
Tycho2	1381-01638-1		Gaia DR2	657244521593509376		HD	68257		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

Period (P)	735.1011y	± 335.2183	Periastron (T)	1800.6148y	± 18.4558	Semi-major axis (a)	8.8962a	± 2.53471
Eccentricity (e)	0.61788	± 0.14111	Inclination (i)	119.578°	± 8.651	Longitude of periastron (ω)	295.246°	± 19.126
Node (Ω)	157.656°	± 15.006	Notes	n		Reference	Izm2019
Equinox			Last observation	2015		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 72.6 6.011 2001 72.2 6.022 2002 71.8 6.033 2003 71.4 6.044 2004 71.0 6.056 2005 70.5 6.067 2006 70.1 6.079 2007 69.7 6.091 2008 69.3 6.103 2009 68.9 6.115 2010 68.5 6.127 2011 68.1 6.139 2012 67.7 6.152 2013 67.3 6.164 2014 66.9 6.177 2015 66.5 6.190 2016 66.1 6.203 2017 65.8 6.216 2018 65.4 6.230 2019 65.0 6.243 2020 64.6 6.256 2021 64.2 6.270 2022 63.8 6.284 2023 63.5 6.298 2024 63.1 6.312 2025 62.7 6.326 2026 62.3 6.340 2027 61.9 6.354 2028 61.6 6.369 2029 61.2 6.383 2030 60.8 6.398 2031 60.5 6.413 2032 60.1 6.428 2033 59.7 6.443 2034 59.4 6.458 2035 59.0 6.473 2036 58.7 6.489 2037 58.3 6.504 2038 58.0 6.519 2039 57.6 6.535 2040 57.2 6.551 2041 56.9 6.567 2042 56.6 6.583 2043 56.2 6.599 2044 55.9 6.615 2045 55.5 6.631 2046 55.2 6.647 2047 54.8 6.663 2048 54.5 6.680 2049 54.2 6.696 2050 53.8 6.713

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. Measures: green=micrometric, blue=interferometric, purple=photographic