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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05496775462578063 3.2453e-08  
a 2.992486222030923 1.1531e-08 au
q 2.827995973657297 9.952e-08 au
i 4.990094691789794 4.5756e-06 deg
node 163.1858932078476 4.0661e-05 deg
peri 250.4762011349154 5.8273e-05 deg
M 333.3633416209827 4.2176e-05 deg
tp 2459140.401994555828
(2020-Oct-17.90199456)
0.00022164 TDB
period 1890.804669393977
5.18
1.0929e-05
2.992e-08
d
yr
n .190395129558985 1.1005e-09 deg/d
Q 3.156976470404547 1.2165e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3046  
   data-arc span      42720 days (116.96 yr)  
   first obs. used      1903-02-07  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44231  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:35:19  

Additional Information
 Earth MOID = 1.84364 au 
 Jupiter MOID = 2.05401 au 
 T_jup = 3.247 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456289.5 (2012-Dec-28.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0544204043390246 3.2839e-08  
q 2.831610705715539 1.0076e-07 au
tp 2457222.986107777471
(2015-Jul-19.48610778)
0.00022171 TDB
node 163.3676437264645 4.0549e-05 deg
peri 245.6865408126976 5.8437e-05 deg
i 4.994078969780658 4.5827e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3046  
   data-arc span      42720 days (116.96 yr)  
   first obs. used      1903-02-07  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44231  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:35:19  

Additional Information
 Jupiter MOID = 2.05401 au 
 T_jup = 3.247 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.078398418254689E-15 -3.289282037390281E-15 -1.496028044341922E-12 -8.204017320948143E-16 -2.771325854500797E-13 1.784196562348414E-16
q -3.289282037390281E-15 1.015177392346467E-14 4.885614657055937E-12 2.973534117321438E-15 8.915990341442656E-13 -4.962512265028261E-16
tp -1.496028044341922E-12 4.885614657055937E-12 4.915480191687323E-8 -1.119265004499116E-11 9.338742666400467E-9 -2.15604950467873E-12
node -8.204017320948143E-16 2.973534117321438E-15 -1.119265004499116E-11 1.644208271993858E-9 -1.639542614938538E-9 -2.057154498991856E-12
peri -2.771325854500797E-13 8.915990341442656E-13 9.338742666400467E-9 -1.639542614938538E-9 3.414869200271057E-9 1.615955120249288E-12
i 1.784196562348414E-16 -4.962512265028261E-16 -2.15604950467873E-12 -2.057154498991856E-12 1.615955120249288E-12 2.100132752164686E-11

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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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, http://obswww.unige.ch/~behrend/page_cou.html]
[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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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 ]
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