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2804 Yrjo (1941 HF)
Classification: Main-belt Asteroid          SPK-ID: 2002804
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0775459928544079 3.956e-08  
a 3.012319638948626 1.9013e-08 au
q 2.778726321751523 1.2041e-07 au
i 11.23167836492545 4.5208e-06 deg
node 109.1651217016236 2.9178e-05 deg
peri 174.3473940350698 5.1378e-05 deg
M 256.4471269937212 4.509e-05 deg
tp 2459149.800075261775
(2020-Oct-27.30007526)
0.00024098 TDB
period 1909.633420622224
5.23
1.808e-05
4.95e-08
d
yr
n .1885178569417264 1.7848e-09 deg/d
Q 3.245912956145729 2.0488e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1923  
   data-arc span      28526 days (78.10 yr)  
   first obs. used      1941-04-03  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46362  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 22:24:09  

Additional Information
 Earth MOID = 1.7619 au 
 Jupiter MOID = 1.90713 au 
 T_jup = 3.215 
[ 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 11.3   n/a MPO445284  
diameter diameter 17.605 km 0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 8.12 h n/a LCDB (Rev. 2019-January); 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.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.]
geometric albedo albedo 0.220   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2804 Yrjo (1941 HF)          Discovered 1941-Apr-19 by Oterma, L. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1941 HF = 1951 EK2 = 1979 QD = 1979 QJ8 = 1982 BY6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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