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283 Emma
Classification: Main-belt Asteroid          SPK-ID: 2000283
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1482674481445992 4.3926e-08  
a 3.046462425869612 1.4079e-08 AU
q 2.59477121611752 1.333e-07 AU
i 7.993511809458252 5.0188e-06 deg
node 304.3708655937737 3.6547e-05 deg
peri 53.61140866653144 3.9317e-05 deg
M 15.93144653823107 1.6444e-05 deg
tp 2456914.550198964442
(2014-Sep-14.05019896)
8.8523e-05 JED
period 1942.192022460027
5.32
1.3464e-05
3.686e-08
d
yr
n .1853575732146275 1.2849e-09 deg/d
Q 3.498153635621706 1.6167e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1466  
   data-arc span      44091 days (120.71 yr)  
   first obs. used      1894-01-11  
   last obs. used      2014-09-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58363  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 13:45:36  

Additional Information
 Earth MOID = 1.60021 AU 
 T_jup = 3.207 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.72 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
diameter diameter 148.06 km 4.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
rotation period rot_per 6.896 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Stanzel, R. (1978) Astron. Astrophys. Suppl. Ser. 34, 373-376.]
[Michalowski, T.; Kaasalainen, M.; Polinska, M.; Marciniak, A.; et al. (2006) Astron. Astrophys. 459, 663-668.]
[Strabla, L.; Quadri, U.; Girelli, R. (2011) Minor Planet Bul. 38, 169-172.]
[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/aster oids3D/web.php]
geometric albedo albedo 0.0262   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
B-V BV .712 mag .031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=18.01 deg.
U-B UB .297 mag .034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1889-Feb-08 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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