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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 
[ 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-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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1918-Jun-04 08:34 00:02 Jupiter 1.9094531010842 1.90945271960545 1.90945348256316 3.50839793584126 3.37959575570397 2421748.856915495 2.0404766523254 93.5407127269635 15.3908006158071 -86.9187558759983 3126028.71987827 T 30 CATAB v2.0f-lin.ifort 2020-Aug-24 22:56:54 2020-Aug-24 22:56
1965-Mar-22 13:14 00:01 Jupiter 1.91668588921166 1.91668548758844 1.91668629083487 3.19967742311986 3.05844648383516 2438842.051618171 1.07989836637984 80.1792630176774 16.728131476438 -84.9826183116988 3377674.36472643 T 30 CATAB v2.0f-lin.ifort 2020-Aug-24 22:56:54 2020-Aug-24 22:56
2011-Dec-30 08:20 < 00:01 Jupiter 1.96813276432193 1.96813233540694 1.96813319323681 3.05749989499824 2.91334317150091 2455925.847383995 0.216967324213428 71.255431211716 16.6668382432898 -88.8828770042695 3419354.20541594 T 30 CATAB v2.0f-lin.ifort 2020-Aug-24 22:56:54 2020-Aug-24 22:56
2049-Aug-14 04:52 < 00:01 Jupiter 1.96097094548531 1.9609705248562 1.96097136611476 3.81452128987524 3.69955293661997 2469667.702634089 0.784561541198793 72.6084099008802 13.8212717640688 -79.9349893831222 3867097.33641529 T 30 CATAB v2.0f-lin.ifort 2020-Aug-24 22:56:54 2020-Aug-24 22:56
2096-Jun-10 16:29 00:02 Jupiter 1.90651844217688 1.90651806040022 1.90651882395386 3.58882702773458 3.46282041149191 2486770.187023793 1.78638264935631 97.2144215530843 15.0011582008484 -86.3524256717811 3318934.41112442 T 30 CATAB v2.0f-lin.ifort 2020-Aug-24 22:56:54 2020-Aug-24 22:56
2143-Apr-02 16:12 00:03 Jupiter 1.9109623563023 1.91096183962779 1.91096287297703 3.32840306879653 3.19245658938098 2503866.175042510 2.88461868454605 85.442431421186 23.4071038600682 -78.8738629452044 3337856.87373544 T 30 CATAB v2.0f-lin.ifort 2020-Aug-24 22:56:54 2020-Aug-24 22:56
2190-Jan-12 20:31 00:04 Jupiter 1.96520024873077 1.96519922504257 1.9652012724335 3.17127002470498 3.03231462507181 2520953.355166911 4.04424255717714 308.893473933289 18.6663794367934 -81.4629270526944 3447375.86258007 T 30 CATAB v2.0f-lin.ifort 2020-Aug-24 22:56:54 2020-Aug-24 22:56

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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