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3553 Mera (1985 JA)
Classification: Amor [NEO]          SPK-ID: 2003553
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 145 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3201562489911295 4.7202e-08  
a 1.644518297293538 6.69e-09 au
q 1.118015487834759 7.8768e-08 au
i 36.77055159951509 9.1083e-06 deg
node 232.527789806629 8.5458e-06 deg
peri 288.8731935318172 1.625e-05 deg
M 261.9356005807387 2.4808e-05 deg
tp 2459210.328928971318
(2020-Dec-26.82892897)
5.4146e-05 TDB
period 770.2939586334473
2.11
4.7004e-06
1.287e-08
d
yr
n .4673540483670207 2.8518e-09 deg/d
Q 2.171021106752316 8.8318e-09 au
  Orbit Determination Parameters
   # obs. used (total)      740  
   data-arc span      12956 days (35.47 yr)  
   first obs. used      1985-05-11  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48062  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-31 06:33:49  

Additional Information
 Earth MOID = .294382 au 
 Jupiter MOID = 3.18066 au 
 T_jup = 4.017 
[ 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 16.4   n/a MPO210363  
rotation period rot_per 3.1944 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2004) http://www.asu.cas.cz/~ppravec/neo.htm]
[Galad, A.; Pravec, P.; Kusnirak, P.; Gajdos, S.; et al. (2005) Earth, Moon, and Planets 97, 147-163.]

3553 Mera (1985 JA)          Discovered 1985-May-14 by Shoemaker, C. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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