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729 Watsonia (1912 OD)

Classification: Main-belt Asteroid SPK-ID: 2000729

[ 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 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 1 (heliocentric ecliptic J2000)

Element	Value	Uncertainty (1-sigma)	Units
e	.09608542264795504	6.0168e-08
a	2.759202049637262	1.8217e-08	AU
q	2.494082954526762	1.6969e-07	AU
i	18.04212953502405	8.4737e-06	deg
node	124.403697973804	2.128e-05	deg
peri	88.29002855743084	4.7826e-05	deg
M	325.1768145904534	4.2187e-05	deg
t_p	2456562.434609088675 (2013-Sep-26.93460909)	0.00019603	JED
period	1674.070266298535 4.58	1.6579e-05 4.539e-08	d yr
n	.215044736918947	2.1296e-09	deg/d
Q	3.024321144747763	1.9967e-08	AU

Orbit Determination Parameters

# obs. used (total)	1092
data-arc span	35056 days (95.98 yr)
first obs. used	1917-04-22
last obs. used	2013-04-14
planetary ephem.	DE405
SB-pert. ephem.	SB405-CPV-2
condition code	0
fit RMS	.54995
data source	ORB
producer	Otto Matic
solution date	2013-Apr-29 12:38:03

Additional Information

Earth MOID = 1.56848 AU

T_jup = 3.264

[ 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	9.31	mag	n/a	IRAS-A-FPA-3-RDR-IMPS-V6.0	IRAS observations used: 17
diameter	diameter	49.15	km	1.5	IRAS-A-FPA-3-RDR-IMPS-V6.0	IRAS observations used: 17
rotation period	rot_per	25.230	h	n/a	Asteroid Lightcurve DataBase (Rev. 2013-May-01)	Published Reference List: [Stephens, R.D. (2013) Posting on CALL web site. http://www.minorplanet.info/call.html]
geometric albedo	albedo	0.1381		0.009	IRAS-A-FPA-3-RDR-IMPS-V6.0	IRAS observations used: 17
B-V	BV	.780	mag	.014	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1	#obs=2; phase (min.=11.06, mean=11.07, max.=11.07) deg.
U-B	UB	.375	mag	.021	EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1	#obs=2; phase (min.=11.06, mean=11.07, max.=11.07) deg.
Tholen spectral type	spec_T	STGD		n/a	EAR-A-5-DDR-TAXONOMY-V4.0	used 2 color indices
SMASSII spectral type	spec_B	L		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)

729 Watsonia (1912 OD) Discovered 1912-Feb-09 by Metcalf, J. H. at Winchester
Reference: DISCOVERY.DB	Last Updated: 2003-08-29

Alternate Designations

1912 OD = 1944 DP

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

2013-May-22 04:14 UT
(server date/time)

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