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(99942) Apophis

Services:

• Ephemerides
• Observation Prediction

Orbital Information:

Keplerian elements at epoch 54200 (MJD)

 

	element value	1-sigma variation
a (AU)	0.922261	2.368e-08
eccentricity	0.191059	7.406e-08
inclination (deg)	3.331	2.021e-06
Asc. node (deg)	204.459	0.0001068
Arg. perih. (deg)	126.386	0.0001059
M (deg)	307.363	3.113e-05

Other useful data:

 

Absolute Magnitude (H)	19.216
Slope parameter (G)	0.15
Perihelion (AU)	0.7461
Aphelion (AU)	1.0985
Asc. node-Earth sep. (AU)	-0.00093
Desc. node-Earth sep. (AU)	-0.19805
Earth MOID (AU)	0.00027
Orbital period (days)	323.504
Date of orbit computation	Apr 5 20:40

Get the orbital details, including covariance and correlation:

- Near middle of observational arc: (MJD = 53478.6): (HTML) (ASCII)
- Near present day (MJD = 54200): (HTML) (ASCII)


Note: Note that the elements are given with reduced precision in order to be more readable. For full precision please use the machine readable ASCII files, which contain equinoctial (not keplerian) elements and are in a format suitable for OrbFit input. Also refer to the discussion in the FAQ.

Minimum Orbital Intersection Distance:

Includes Orbit diagram.

- with .gif figures

Proper elements and encounter conditions:

- Proper elements and encounter conditions with .gif figures

Observational Information:

 

Optical Astrometry
RMS of residuals (arcsec)	3.02127E-01
Date of first obs. (yr/mo/day)	2004/03/15.10789
Date of last obs. (yr/mo/day)	2006/08/16.626954
Number of Observations	1000
Number Discarded	5
Radar Astrometry
Date of first obs. (yr/mo/day)	2005/01/27
Date of last obs. (yr/mo/day)	2006/05/06
Number of Observations	7
Delay observations	2
Discarded delay	0
Doppler observations	5
Discarded Doppler	0
Arc Information
Arc length (days)	885
Days unobserved	238

Get the observational details: optical observations, radar observations, ASCII file
Note: The ASCII file is in a format suitable for OrbFit input.

Close Approaches (from 1950 to 2100):

Information on converting to and from MJD is available.

 

Planet	Date	MJD	Nominal Distance (AU)	Minimum Possible Distance (AU)	Stretching (AU)	Width (AU)	Close approach probability	Linearity Applies
EARTH	1957/04/01.12043	35929.1	0.0754381	0.0752724	5.525e-05	9.846e-08	1	Yes
EARTH	1964/10/24.91759	38692.9	0.187672	0.187573	3.344e-05	6.677e-08	1	Yes
EARTH	1965/02/11.49916	38802.5	0.125836	0.12583	9.174e-06	4.95e-08	1	Yes
EARTH	1972/12/24.48574	41675.5	0.0792198	0.0791341	3.13e-05	3.39e-08	1	Yes
EARTH	1980/12/18.07836	44591.1	0.0721386	0.0720843	2.255e-05	4.757e-08	1	Yes
EARTH	1982/04/11.51201	45070.5	0.179518	0.179462	1.865e-05	1.016e-07	1	Yes
EARTH	1990/04/14.86419	47995.9	0.0329362	0.0329072	1.024e-05	1.027e-07	1	Yes
EARTH	1998/04/14.82361	50917.8	0.0243859	0.0243842	1.65e-06	1.026e-07	1	Yes
EARTH	2004/12/21.39225	53360.4	0.0963839	0.0963838	4.986e-08	2.798e-08	1	Yes
EARTH	2013/01/09.48831	56301.5	0.0966614	0.0966592	1.17e-06	3.386e-08	1	Yes
EARTH	2021/03/06.05184	59279.1	0.112651	0.112648	1.166e-06	7.283e-08	1	Yes
EARTH	2029/04/13.90710	62239.9	0.000255	0.0002534	3.63e-06	7.949e-08	1	Yes
EARTH	2037/09/22.53694	65323.5	0.180254	0.119544	0.1621	1.746e-05	0.33	No
EARTH	2044/07/22.82121	67818.8	0.117654	0.101432	0.08046	2.698e-05	0.714	No
EARTH	2051/04/11.01110	70272	0.0398186	0.021002	0.3286	5.629e-07	0.202	No
EARTH	2059/09/13.80186	73349.8	0.0227782	0.0120618	0.8283	1.736e-05	0.0803	Yes
EARTH	2066/05/10.71385	75780.7	0.0880835	0.0152553	4.475	9.544e-06	0.0149	No
EARTH	2081/09/03.13428	81375.1	0.0627759	0.0331402	11.19	1.976e-05	0.00587	No
EARTH	2088/04/15.25889	83791.3	0.0134445	0.0043436	6.225	1.192e-07	0.0107	Yes
EARTH	2095/04/07.98723	86340	0.0892276	0.0783836	140.6	1.907e-06	0.000436	No

Ephemeris:

Ephemeris at epoch 54202 (MJD)

 

Right Ascension (deg)	331.639
Declination (deg)	-8.95185
V Magnitude	21.08
Solar Elongation (deg)	51.19
Phase (deg)	69.48
Galactic Latitude (deg)	-47.11
Distance from Earth (AU)	0.92
Distance from Sun (AU)	0.834
Apparent motion
Rate (deg/day)	1.3
Direction (PA deg)	68.68
Uncertainty Ellipse (1-sigma)
Semimajor axis (arcmin)	0.001
Semiminor axis (arcmin)	0
Orientation (PA deg)	72.17

Physical Information

The following link will take you directly to the appropriate page in the NEA database of physical and bibliographic information for near-Earth asteroids, maintained at the European Asteroid Research Node (E.A.R.N.) by Gerhard Hahn.

(99942) Apophis physical data

Orbit Animation

The following link points to a Java orbit animation maintained by the NEO Program Office at the Jet Propulsion Laboratory:

JPL Orbit Diagram