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162173 Ryugu (1999 JU3)

Classification: Apollo [NEO, PHA] SPK-ID: 2162173

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]

Orbital Elements at Epoch 2455907.5 (2011-Dec-12.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.1902257533711703	4.0878e-08
a	1.189600821984975	3.3264e-09	au
q	.9633081094119196	4.7907e-08	au
i	5.883742390778817	3.9603e-06	deg
node	251.6197109778495	3.7157e-05	deg
peri	211.4258497031505	4.1484e-05	deg
M	3.983244739497243	2.5274e-05	deg
t_p	2455902.256336660653 (2011-Dec-06.75633666)	3.3258e-05	TDB
period	473.9148422005283 1.30	1.9878e-06 5.442e-09	d yr
n	.7596301443702679	3.1861e-09	deg/d
Q	1.41589353455803	3.9592e-09	au

Additional Model Parameters

Parameter	Value	Uncertainty (1-sigma)
A2 [EST]	-3.37188018015251E-14	1.654E-14
ALN [SET]	1.	n/a
NK [SET]	0.	n/a
NM [SET]	2.	n/a
R0 [SET]	1.	n/a

Orbit Determination Parameters

# obs. used (total)	725
data-arc span	11075 days (30.32 yr)
first obs. used	1986-04-14
last obs. used	2016-08-09
planetary ephem.	DE431
SB-pert. ephem.	SB431-N16
condition code	0
norm. resid. RMS	.35206
source	ORB
producer	Davide Farnocchia
solution date	2018-Mar-28 16:14:14

Additional Information

Earth MOID = .000638309 au

Jupiter MOID = 3.70038 au

T_jup = 5.308

Yarkovsky a priori (-25+-25)e-15 au/d^2

[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table

Parameter	Symbol	Value	Units	Sigma	Reference	Notes
absolute magnitude	H	19.3		n/a	MPO385718
rotation period	rot_per	7.627	h	n/a	LCDB (Rev. 2019-January); Warner et al., 2009	Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Abe, M.; Kawakami, K.; Hasegawa, S.; Kuroda, D.; Yoshikawa, M.; et al. (2008) Lunar & Planetary Sci. XXXIX. No. 1391, p. 1594.] [Muller, T.G.; Durech, J.; Hasegawa, S.; Abe, M.; et al. (2011) Astron. Astrophys. 525, A145.] [Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Ishiguro, M.; et al. (2013) Astron. Astrophys. 550, L11.] [Moskovitz, N.A.; Abe, S.; Pan, K.-S.; Osip, D.J.; et al. (2013) Icarus 224, 24.] [Muller, T.G.; Durech, J.; Ishiguro, M.; Mueller, M.; et al. (2017) Astron. Astrophys. 599, A103.]
SMASSII spectral type	spec_B	Cg		n/a	Binzel et al. (2001) Icarus 151, 139-149

162173 Ryugu	Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Ryugu is the undersea palace of the Dragon God. In a Japanese legend, a fisherman was rewarded with a visit to Ryugu and brought back a box with a secret. The spaceprobe Hayabusa 2 will visit this asteroid and bring back a capsule containing surface samples.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2015-09-28	Last Updated: 2015-10-05

[ show close-approach data ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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