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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 144 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3201562490933487 4.7213e-08  
a 1.644518296184629 7.1623e-09 au
q 1.118015486912773 7.8769e-08 au
i 36.77055173445697 9.1532e-06 deg
node 232.5277896752244 8.5522e-06 deg
peri 288.8731921354261 1.6734e-05 deg
M 261.9356047139672 2.6804e-05 deg
tp 2459210.328919915193
(2020-Dec-26.82891992)
5.8523e-05 TDB
period 770.2939578543263
2.11
5.0322e-06
1.378e-08
d
yr
n .4673540488397303 3.0532e-09 deg/d
Q 2.171021105456485 9.4553e-09 au
  Orbit Determination Parameters
   # obs. used (total)      736  
   data-arc span      12525 days (34.29 yr)  
   first obs. used      1985-05-11  
   last obs. used      2019-08-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4816  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-19 07:10:58  

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. 2019-August); 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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