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21221 (1994 YM1)
Classification: Main-belt Asteroid          SPK-ID: 2021221
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08407317412318618 3.2492e-08  
a 2.981416605349264 1.8199e-08 au
q 2.730759447953977 9.3803e-08 au
i 11.75725207836523 3.7892e-06 deg
node 91.35886194943424 1.7107e-05 deg
peri 207.2485891455107 2.9059e-05 deg
M 183.1927426140396 2.5141e-05 deg
tp 2460123.985354889043
(2023-Jun-28.48535489)
0.00013391 TDB
period 1880.32285934013
5.15
1.7217e-05
4.714e-08
d
yr
n .1914564821736711 1.7531e-09 deg/d
Q 3.232073762744552 1.973e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2231  
   data-arc span      10427 days (28.55 yr)  
   first obs. used      1992-07-05  
   last obs. used      2021-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41944  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:51:27  

Additional Information
 Earth MOID = 1.71819 au 
 Jupiter MOID = 1.93276 au 
 T_jup = 3.222 
[ 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 13.41   n/a E2021B10  
diameter diameter 7.929 km 0.270 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 36.2974 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 0.256   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21221 (1994 YM1)          Discovered 1994-Dec-31 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1994 YM1 = 2000 AS22 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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