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2207 Antenor (1977 QH1)

Classification: Jupiter Trojan SPK-ID: 2002207

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]

Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.01610151218585262	4.0535e-08
a	5.150342898993684	6.5618e-08	au
q	5.067414590044217	1.9117e-07	au
i	6.802370576030514	4.7084e-06	deg
node	159.1120600242695	3.3357e-05	deg
peri	307.7630794813377	0.00016249	deg
M	104.2677038014591	0.00015699	deg
t_p	2457363.983396525691 (2015-Dec-07.48339653)	0.001865	TDB
period	4269.260384772396 11.69	8.1589e-05 2.234e-07	d yr
n	.0843237393727608	1.6115e-09	deg/d
Q	5.23327120794315	6.6675e-08	au

Orbit Determination Parameters

# obs. used (total)	2789
data-arc span	22074 days (60.44 yr)
first obs. used	1959-03-11
last obs. used	2019-08-17
planetary ephem.	DE431
SB-pert. ephem.	SB431-N16
condition code	0
norm. resid. RMS	.46277
source	ORB
producer	Otto Matic
solution date	2019-Sep-23 19:23:05

Additional Information

Earth MOID = 4.08906 au

Jupiter MOID = .212008 au

T_jup = 2.986

[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table

Parameter	Symbol	Value	Units	Sigma	Reference	Notes
absolute magnitude	H	8.9		n/a	MPO492776	IRAS observations used: 9
diameter	diameter	97.658	km	0.504	urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)
rotation period	rot_per	7.9647	h	n/a	LCDB (Rev. 2019-January); Warner et al., 2009	Published Reference List: [Gonano, M.; Di Martino, M.; Mottola, S.; Neukum, G. (1991) Adv. Space Res. 11, no. 12, 197-200.] [Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Stephens, R.D.; Coley, D.R.; French, L.M. (2016) Minor Planet Bull. 43, 265-270.] [Stephens, R.D.; Coley, D.R. (2017) Minor Planet Bull. 44, 252-257.] [Stephens, R.D.; Pravec, P.; Kueakova, H.; Kusnirak, P.; et al. (2018) Minor Planet Bull. 45, 341-342.]
geometric albedo	albedo	0.051		0.003	urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)
B-V	BV	0.733		0.035	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2	#obs=3; phase (min.=1.44, mean=2.56, max.=4.58) deg.
U-B	UB	0.232		0.038	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2	#obs=3; phase (min.=1.44, mean=2.56, max.=4.58) deg.
Tholen spectral type	spec_T	D		n/a	EAR-A-5-DDR-TAXONOMY-V4.0	used 7 color indices; used ground-based radiometric albedo

2207 Antenor	Discovered 1977 Aug. 19 by N. S. Chernykh at the Crimean Astrophysical Observatory.
This Trojan planet is named for the Trojan hero and sage who called for peace with the Greeks. He advised the citizens of Troy to put an end to the war by returning the kidnapped Helen to her husband Menelaus.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5849	Last Updated: 2006-03-21

Alternate Designations

1977 QH1 = 1959 EM = 1971 BE1 = 1978 UU

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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