Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
137170 (1999 HF1)
Classification: Aten [NEO]          SPK-ID: 2137170
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 467 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4624220798092277 5.2719e-08  
a .8191606473868284 7.8401e-10 au
q .4403626771243377 4.3323e-08 au
i 25.66080692597536 5.8036e-06 deg
node 155.8641199572272 2.0361e-05 deg
peri 253.4032520461379 1.8063e-05 deg
M 88.50259167112716 1.4537e-05 deg
tp 2459329.925864515223
(2021-Apr-25.42586452)
1.0894e-05 TDB
period 270.8021123672744
0.74
3.8878e-07
1.064e-09
d
yr
n 1.32938401718134 1.9085e-09 deg/d
Q 1.197958617649319 1.1466e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3797  
   data-arc span      8137 days (22.28 yr)  
   first obs. used      1999-04-20  
   last obs. used      2021-07-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .33185  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-31 05:52:31  

Additional Information
 Earth MOID = .173162 au 
 Jupiter MOID = 4.31516 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-26 08:03 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin