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17378 (1981 EM5)
Classification: Main-belt Asteroid          SPK-ID: 2017378
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04682335824864584 4.2506e-08  
a 3.096548079144693 2.3381e-08 au
q 2.951557299100745 1.2512e-07 au
i 8.170705268462113 4.5621e-06 deg
node 271.9170185479749 4.0233e-05 deg
peri 183.2738617675299 7.6501e-05 deg
M 195.3001769415837 6.6939e-05 deg
tp 2460111.054196020875
(2023-Jun-15.55419602)
0.00037467 TDB
period 1990.284533889573
5.45
2.2542e-05
6.172e-08
d
yr
n .1808786602468639 2.0486e-09 deg/d
Q 3.241538859188641 2.4476e-08 au
  Orbit Determination Parameters
   # obs. used (total)      892  
   data-arc span      14433 days (39.52 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-08-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55542  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:21:22  

Additional Information
 Earth MOID = 1.96811 au 
 Jupiter MOID = 1.91021 au 
 T_jup = 3.206 
[ 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 14.0   n/a MPO344441  
diameter diameter 6.867 km 0.307 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 18.4114 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.113   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17378 (1981 EM5)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

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