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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07802385061347011 3.6605e-08  
a 3.013704323947161 1.4689e-08 au
q 2.778563507982339 1.1514e-07 au
i 11.23181204886131 3.8627e-06 deg
node 109.1635779328569 2.1239e-05 deg
peri 174.1689047956509 3.5661e-05 deg
M 332.0473912341088 2.7415e-05 deg
tp 2459148.877904700140
(2020-Oct-26.37790470)
0.00014527 TDB
period 1910.95028515659
5.23
1.3971e-05
3.825e-08
d
yr
n .1883879464559175 1.3773e-09 deg/d
Q 3.248845139911984 1.5835e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2405  
   data-arc span      28977 days (79.33 yr)  
   first obs. used      1941-04-03  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42879  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:56:42  

Additional Information
 Earth MOID = 1.76236 au 
 Jupiter MOID = 1.90516 au 
 T_jup = 3.215 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456972.5 (2014-Nov-11.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07627712483970039 3.6631e-08  
q 2.78321447290919 1.1497e-07 au
tp 2457239.331178316699
(2015-Aug-04.83117832)
0.00015267 TDB
node 109.1816287478256 2.1245e-05 deg
peri 174.3975850127493 3.6211e-05 deg
i 11.22992571475358 3.8621e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2405  
   data-arc span      28977 days (79.33 yr)  
   first obs. used      1941-04-03  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42879  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:56:42  

Additional Information
 Jupiter MOID = 1.90516 au 
 T_jup = 3.215 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.34180388026821E-15 -4.18401925173552E-15 -3.95633285875604E-13 -9.857244830116643E-15 -4.020098836487918E-14 -7.225987321956375E-16
q -4.18401925173552E-15 1.321806552876425E-14 5.361634088912066E-13 3.379598302679716E-14 -1.44138127240888E-14 2.651981300872881E-15
tp -3.95633285875604E-13 5.361634088912066E-13 2.330710414537757E-8 1.243099703608674E-11 4.500482759815583E-9 -1.801912562687214E-12
node -9.857244830116643E-15 3.379598302679716E-14 1.243099703608674E-11 4.51369802524554E-10 -4.399921019742206E-10 -1.348330218172867E-11
peri -4.020098836487918E-14 -1.44138127240888E-14 4.500482759815583E-9 -4.399921019742206E-10 1.311228387716035E-9 1.286409678481719E-11
i -7.225987321956375E-16 2.651981300872881E-15 -1.801912562687214E-12 -1.348330218172867E-11 1.286409678481719E-11 1.491591838157504E-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

[ 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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