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723 Hammonia (A911 UO)
Classification: Main-belt Asteroid          SPK-ID: 2000723
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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.

Note: If the applet is not working, here are some notes that might help.
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05496775654828114 3.2071e-08  
a 2.99248621987908 1.0585e-08 au
q 2.82799596587068 9.7667e-08 au
i 4.990093099452907 4.052e-06 deg
node 163.1858969505026 4.0156e-05 deg
peri 250.4761888912684 5.4585e-05 deg
M 333.3633510918628 3.6321e-05 deg
tp 2459140.401944661637
0.00019072 TDB
period 1890.804667354512
n .1903951297643495 1.0102e-09 deg/d
Q 3.156976473887479 1.1166e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3291  
   data-arc span      42997 days (117.72 yr)  
   first obs. used      1903-02-07  
   last obs. used      2020-10-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43037  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:26:31  

Additional Information
 Earth MOID = 1.84364 au 
 Jupiter MOID = 2.05401 au 
 T_jup = 3.247 
[ 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 10.0   n/a MPO452167  
diameter diameter 23.456 km 0.988 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 5.436 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2007) Observatoire de Geneve web site,]
[Shevchenko, V.G.; Slyusarev, I.G.; Belskaya, I.N.; Checha, V.A.; et al. (2015) Lunar & Planetary Sci. LXVI, #1832.]
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
geometric albedo albedo 0.352   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
SMASSII spectral type spec_B C   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)

723 Hammonia (A911 UO)          Discovered 1911-Oct-21 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A911 UO = 1949 YR = 1955 FU1 = A903 CA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Nov-28 12:18 UT
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