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137170 (1999 HF1)
Classification: Aten [NEO]          SPK-ID: 2137170
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 464 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .46243740329538 5.2742e-08  
a .8191495668763246 7.8828e-10 au
q .4403441682595018 4.3344e-08 au
i 25.66043824804064 5.8049e-06 deg
node 155.8656789794098 2.0382e-05 deg
peri 253.4082602135487 1.8082e-05 deg
M 187.9386611944913 1.4392e-05 deg
tp 2459329.926746124385
(2021-Apr-25.42674612)
1.0905e-05 TDB
period 270.796617812245
0.74
3.9089e-07
1.07e-09
d
yr
n 1.329410990832993 1.919e-09 deg/d
Q 1.197954965493147 1.1528e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3785  
   data-arc span      7724 days (21.15 yr)  
   first obs. used      1999-04-20  
   last obs. used      2020-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .33216  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-16 06:26:55  

Additional Information
 Earth MOID = .174024 au 
 Jupiter MOID = 4.31429 au 
 T_jup = 6.986 
[ 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 14.56   n/a E2021B55  
rotation period rot_per 2.3192 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Sarounova, L.; Hicks, M.D.; Rabinowitz, D.L.; et al. (2002) Minor Planet Bull. 29, 23-25.]
[Pravec, P.; Sarounova, L.; Hicks, M.D.; Rabinowitz, D.L.; et al. (2002) Icarus 158, 276-280.]
[Polishook, D.; Brosch, N.; Prianik, D. (2005) Abstr. IAU Symp. 229, p. 60-61.]
[Pravec, P.; et al. (2006) Icarus 181, 63-93.]
[Polishook, D.; Brosch, N. (2008) Icarus 194, 111-124.]
[Elenin, L.; Molotov, I. (2012) Minor Planet Bull. 39, 101-102.]
[Marchis, F.; Enriquez, J.E.; Emery, J.P.; Mueller, M.; et al. (2012) Icarus 221, 1130-1161.]
[Warner, B.D. (2016) Minor Planet Bull. 43, 311-319.]
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.J.; Pravec, P.; Koehn, B.W. (2019) Minor Plantet Bull. 46, 238-265.]
SMASSII spectral type spec_B X:   n/a Binzel et al. (2004) Icarus 170, 259-294 SMASSIR data only, classification consistent with specified type, but uncertain

137170 (1999 HF1)          Discovered 1999-Apr-20 by LONEOS at Anderson Mesa
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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