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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07802385035408675 3.6594e-08  
a 3.013704322664682 1.4619e-08 au
q 2.778563507581628 1.1509e-07 au
i 11.23181217098843 3.8584e-06 deg
node 109.163583319737 2.0476e-05 deg
peri 174.1688951824299 3.4952e-05 deg
M 332.047396175335 2.6899e-05 deg
tp 2459148.877878376434
(2020-Oct-26.37787838)
0.0001425 TDB
period 1910.950283936785
5.23
1.3905e-05
3.807e-08
d
yr
n .18838794657617 1.3708e-09 deg/d
Q 3.248845137747735 1.576e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2531  
   data-arc span      29052 days (79.54 yr)  
   first obs. used      1941-04-03  
   last obs. used      2020-10-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42135  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:05:55  

Additional Information
 Earth MOID = 1.76236 au 
 Jupiter MOID = 1.90516 au 
 T_jup = 3.215 
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Orbital Elements at Epoch 2457094.5 (2015-Mar-13.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07635842418829507 3.6618e-08  
q 2.783276742915123 1.1493e-07 au
tp 2457239.097626549315
(2015-Aug-04.59762655)
0.00015007 TDB
node 109.1819225682377 2.0482e-05 deg
peri 174.3474848094582 3.5475e-05 deg
i 11.2298748187252 3.8579e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2531  
   data-arc span      29052 days (79.54 yr)  
   first obs. used      1941-04-03  
   last obs. used      2020-10-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42135  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:05:55  

Additional Information
 Jupiter MOID = 1.90516 au 
 T_jup = 3.215 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.340894681442459E-15 -4.181581137076764E-15 -3.929015856129144E-13 -7.025601530964907E-15 -4.249001154946785E-14 -6.444256087243136E-16
q -4.181581137076764E-15 1.320992548207019E-14 4.894464530065579E-13 2.452433276949045E-14 -1.344861350749747E-14 2.396274780422966E-15
tp -3.929015856129144E-13 4.894464530065579E-13 2.251984961743098E-8 6.482482885268658E-12 4.368457326317635E-9 -2.007862439327564E-12
node -7.025601530964907E-15 2.452433276949045E-14 6.482482885268658E-12 4.195136628364233E-10 -4.098171627326497E-10 -1.439044500918028E-11
peri -4.249001154946785E-14 -1.344861350749747E-14 4.368457326317635E-9 -4.098171627326497E-10 1.258499351560897E-9 1.37168861506114E-11
i -6.444256087243136E-16 2.396274780422966E-15 -2.007862439327564E-12 -1.439044500918028E-11 1.37168861506114E-11 1.488309861254817E-11

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-August); 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

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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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