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49438 (1998 YD4)
Classification: Main-belt Asteroid          SPK-ID: 2049438
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05206965913225873 4.3475e-08  
a 3.001047216346568 1.5629e-08 au
q 2.844783710751589 1.3523e-07 au
i 2.482425794802638 3.824e-06 deg
node 201.8140602324752 9.1905e-05 deg
peri 336.3114484497638 9.8641e-05 deg
M 340.0437767601325 3.5578e-05 deg
tp 2459105.764885441877
(2020-Sep-13.26488544)
0.00018776 TDB
period 1898.924375799237
5.20
1.4834e-05
4.061e-08
d
yr
n .1895810094325004 1.4809e-09 deg/d
Q 3.157310721941548 1.6443e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2000  
   data-arc span      9145 days (25.04 yr)  
   first obs. used      1995-05-26  
   last obs. used      2020-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48558  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:32:38  

Additional Information
 Earth MOID = 1.84818 au 
 Jupiter MOID = 1.8055 au 
 T_jup = 3.249 
[ 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 13.5   n/a MPO385133  
diameter diameter 5.036 km 0.212 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.44 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:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]
geometric albedo albedo 0.365   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49438 (1998 YD4)          Discovered 1998-Dec-19 by Kobayashi, T. at Oizumi
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 YD4 = 2000 EX103 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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