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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07877148139348084 1.6622e-08  
a 3.016247890914776 1.2828e-08 au
q 2.778653576297457 5.1352e-08 au
i 11.23046024639616 4.8719e-07 deg
node 109.1641468992817 4.772e-06 deg
peri 173.8533714140935 1.9574e-05 deg
M 9.98322547860479 1.538e-05 deg
tp 2459147.439986877665
(2020-Oct-24.93998688)
8.175e-05 TDB
period 1913.370059103408
5.24
1.2206e-05
3.342e-08
d
yr
n .1881496986362866 1.2003e-09 deg/d
Q 3.253842205532095 1.3838e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2576  
   data-arc span      29052 days (79.54 yr)  
   first obs. used      1941-04-03  
   last obs. used      2020-10-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42112  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:18:28  

Additional Information
 Earth MOID = 1.76056 au 
 Jupiter MOID = 1.89917 au 
 T_jup = 3.214 
[ 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 11.35   n/a E2021B10  
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. 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.; 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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