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JPL Small-Body Database Browser
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4478 Blanco (1984 HG1)
Classification: Main-belt Asteroid          SPK-ID: 2004478
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1343479676124424 3.1558e-08  
a 2.248659004431033 6.7368e-09 au
q 1.946556237332306 7.0024e-08 au
i 3.281974460286974 3.4036e-06 deg
node 266.9947514769124 7.042e-05 deg
peri 4.973292667525124 7.2145e-05 deg
M 200.8655941433581 1.7319e-05 deg
tp 2459544.934222368419
(2021-Nov-26.43422237)
6.003e-05 TDB
period 1231.640128340294
3.37
5.5348e-06
1.515e-08
d
yr
n .2922931721014324 1.3135e-09 deg/d
Q 2.550761771529761 7.6419e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1931  
   data-arc span      24984 days (68.40 yr)  
   first obs. used      1951-09-04  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49659  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:14:26  

Additional Information
 Earth MOID = .930335 au 
 Jupiter MOID = 2.53688 au 
 T_jup = 3.615 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456115.5 (2012-Jul-07.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1342027187064985 3.142e-08  
q 1.946410993491264 6.9668e-08 au
tp 2455848.284985456920
(2011-Oct-13.78498546)
5.6843e-05 TDB
node 267.0654120130239 7.0491e-05 deg
peri 4.36524772432892 7.2229e-05 deg
i 3.279843290307563 3.4026e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1931  
   data-arc span      24984 days (68.40 yr)  
   first obs. used      1951-09-04  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49659  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:14:26  

Additional Information
 Jupiter MOID = 2.53688 au 
 T_jup = 3.615 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.872321626276287E-16 -2.181638663772188E-15 2.50979070140283E-13 7.822781782498836E-16 5.758739648667958E-14 5.262635975793919E-17
q -2.181638663772188E-15 4.853672812524159E-15 -5.365894093388061E-13 -1.790891428956638E-15 -1.208443007160634E-13 -8.517839171735191E-17
tp 2.50979070140283E-13 -5.365894093388061E-13 3.231145052938885E-9 2.72979096679001E-13 9.117201854152623E-10 -1.145676883441875E-12
node 7.822781782498836E-16 -1.790891428956638E-15 2.72979096679001E-13 4.968964639175748E-9 -4.960554155893304E-9 3.077520686666127E-12
peri 5.758739648667958E-14 -1.208443007160634E-13 9.117201854152623E-10 -4.960554155893304E-9 5.216995747705133E-9 -3.404935214453446E-12
i 5.262635975793919E-17 -8.517839171735191E-17 -1.145676883441875E-12 3.077520686666127E-12 -3.404935214453446E-12 1.157793392597389E-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 14.1   n/a MPO298994  
diameter diameter 3.519 km 0.623 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.347   0.137 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

4478 Blanco (1984 HG1)          Discovered 1984-Apr-23 by Ferreri and Zappala at La Silla
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
1979-Jan-25 04:01 < 00:01 Amphi 0.0429105543384395 0.0429093269204074 0.0429117818460206 3.84728368477048 3.8472836499484 2443898.667555659 0.441406891220796 125.078813776312 27.2400390538537 -63.344794400488 211747.620577623 T 34 CATAB v2.0f-lin.ifort 2020-Feb-22 17:14:39 2020-Feb-22 17:14
2081-Mar-14 13:10 < 00:01 Eunom 0.0490882143446554 0.0490831224575895 0.0490933063930517 5.2686287605375 5.26862870626009 2481203.048348608 0.467559953438838 290.406026099336 30.7326870627946 -29.2820527049152 118859.830860138 T 34 CATAB v2.0f-lin.ifort 2020-Feb-22 17:14:39 2020-Feb-22 17:14

Alternate Designations
 1984 HG1 = 1951 RN = 1978 TT1 = 1988 QN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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