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253 Mathilde

Classification: Main-belt Asteroid SPK-ID: 2000253

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

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Orbit Diagram

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2454800.5 (2008-Nov-30.0) TDB
Reference: JPL 123 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.266755211055886	2.8092e-08
a	2.645441753404595	5.1957e-09	AU
q	1.939756380139099	7.5074e-08	AU
i	6.741388542900605	5.6416e-06	deg
node	179.621337776514	2.4075e-05	deg
peri	157.5118768315754	2.4421e-05	deg
M	249.3060770128574	7.3232e-06	deg
t_p	2455283.744601308486 (2010-Mar-28.24460131)	3.2649e-05	JED
period	1571.613434382139 4.30	4.6301e-06 1.268e-08	d yr
n	.2290639619923647	6.7483e-10	deg/d
Q	3.35112712667009	6.5817e-09	AU

Orbit Determination Parameters

# obs. used (total)	1666
# delay obs. used	1
# Doppler obs. used	0
data-arc span	44769 days (122.57 yr)
first obs. used	1885-12-01
last obs. used	2008-06-28
planetary ephem.	DE405
SB-pert. ephem.	SB405-CPV-2
quality code	0
fit RMS	.67659
data source	ORB
producer	Otto Matic
solution date	2008-Sep-19 12:57:06

Additional Information

Earth MOID = .931272 AU

T_jup = 3.332

[ show covariance matrix ]

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

Physical Parameter Table

Parameter	Symbol	Value	Units	Sigma	Reference	Notes
absolute magnitude	H	10.20	mag	n/a	IRAS-A-FPA-3-RDR-IMPS-V6.0	IRAS observations used: 20
diameter	diameter	52.8	km	n/a	n/a	Yeomans E-mail 2001-Apr-04
GM	GM	0.00689	km^3/s^2	0.00030	Yeomans et al. (1997) Science v.278, pp.2106-2109
bulk density	density	1.3	g/cm^3	0.2	Yeomans et al. (1997) Science v.278, pp.2106-2109	based on a nominal volume of 78000 km^3 (with lower/uppper limits of 67000/90000 km^3)
rotation period	rot_per	417.7	h	n/a	IAU Lightcurve Data (A.W. Harris, E-mail Mar. 2006)	"Tumbling" (non-principal axis rotational motion), alternate(s): 250. Published Reference List: [Mottola, S., Sears, W.D., Erikson, A., Harris, A.W., Young, J.W., Hahn, G., Dahlgren, M., Mueller, B.E.A., Owen, W., Gil-Hutton, R., Licandro, J., Barruci, M.A., Angeli, C., Neukum, G., Lagerkvist, C.-I., Lahulla, J.F.: 1995, Planet. Space Sci. 43, 1609-1613.] [Pravec, P., plus 19 co-authors: 2005, Icarus 173, 108-131.]
geometric albedo	albedo	0.0436		0.004	IRAS-A-FPA-3-RDR-IMPS-V6.0	IRAS observations used: 20
SMASSII spectral type	spec_B	Cb		n/a	EAR-A-5-DDR-TAXONOMY-V4.0	based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

253 Mathilde	Discovered 1885-Nov-12 by Palisa, J. at Vienna
Reference: DISCOVERY.DB	Last Updated: 2003--0-8-

Alternate Designations

1949 OL1 = A915 TN

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

2008-Sep-20 08:31 UT
(server date/time)

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