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283 Emma (A889 CA)
Classification: Main-belt Asteroid          SPK-ID: 2000283
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 83 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .144110730805171 3.8641e-08  
a 3.048200198555758 1.0852e-08 au
q 2.60892184030142 1.1771e-07 au
i 7.989497455485445 4.2336e-06 deg
node 303.901180152594 2.9848e-05 deg
peri 55.25229574537844 3.2853e-05 deg
M 24.85095072430224 1.4087e-05 deg
tp 2458866.314939949660
(2020-Jan-17.81493995)
7.5948e-05 TDB
period 1943.854066350959
5.32
1.038e-05
2.842e-08
d
yr
n .1851990878491198 9.8898e-10 deg/d
Q 3.487478556810095 1.2416e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3201  
   data-arc span      46314 days (126.80 yr)  
   first obs. used      1894-01-11  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43614  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:31:21  

Additional Information
 Earth MOID = 1.61484 au 
 Jupiter MOID = 1.99994 au 
 T_jup = 3.207 
[ 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 8.6   n/a MPO502155 IRAS observations used: 4
diameter diameter 132.385 km 0.258 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.896 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Stanzel, R. (1978) Astron. Astrophys. Suppl. Ser. 34, 373-376.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Michalowski, T.; Kaasalainen, M.; Polinska, M.; Marciniak, A.; et al. (2006) Astron. Astrophys. 459, 663-668.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT). http://astro.troja.mff.cuni.cz/projects/asteroids3D/web.php]
[Strabla, L.; Quadri, U.; Girelli, R. (2011) Minor Planet Bull. 38, 169-172.]
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Alton, K.B. (2015) Minor Planet Bull. 42, 146-148.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.]
geometric albedo albedo 0.023   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.712   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=18.01 deg.
U-B UB 0.297   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=18.01 deg.
Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

283 Emma (A889 CA)          Discovered 1889-Feb-08 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A889 CA = 1980 FJ12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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