( 99942) Apophis

(2004 MN4 )

Discovery Circumstances:

R. A. Tucker, D. J. Tholen, F. Bernardi - Kitt Peak

19 Jun 2004

(1)

Orbital Type:

AT

(*)( 2)( 3)( 4)( 5)( 6)( 7)( 8)( 9)(10)

Taxonomic Type:

Sq

(11)

Albedo:

0.33

(12)

Diameter:(km)

0.270

(13)

H:(mag)

19.7

(14)

G:

0.15

(#)

U-B:(mag)

-

-

B-V:(mag)

-

-

Rotation Period:(hrs)

30.5376

(15)

Quality:

2 !

(15)

Lightcurve Amplitude:(mag)

1.0

(15)

Spin Vector:

-

-

Radar Observations:

Y

(16)(17)(18)(19)

Spectral Observations:

Y

(20)(21)(22)

IR Observations:

-

-

Remarks

* - orbital type derived from osculating orbital elements

# - absolute magnitude H derived from astrometric observation via orbit determination - G value assumed to be 0.15

! - quality code according to Lagerkvist et al. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1162-1179.

References

( 1) M.P.E.C. 2004-Y25

( 2) Binzel, R.P. et al. (2007) DPS 39, 13.04. (Spectral Properties and Composition of Potentially Hazardous Asteroid (99942) Apophis)

( 3) Giorgini, J.D. et al. (2008) Icarus 193, 1-19. (Predicting the Earth encounters of (99942) Apophis)

( 4) Rubincam, D.P. (2007) Icarus 192, 460-468. (Orbital YORP and asteroid orbit evolution, with application to Apophis)

( 5) Sokolov, L.L. et al. (2008) SSR 42, 18-27. (Peculiarities of the Motion of Asteroid 99942 Apophis)

( 6) Chesley, S.R. et al. (2009) DPS 41, 4306. (An Updated Assessment Of The Impact Threat From 99942 Apophis)

( 7) Tholen, D.J. et al. (2009) DPS 41, 4305. (Here is Apophis!)

( 8) Ivashkin, V.V. & C.A. Stikhno (2009) Solar System Research 43, 483-496. (On the Prevention of a Possible Collision of Asteroid Apophis with the Earth)

( 9) Wlodarczyk, I. (2007) Contrib. Astron. Obs. Skalnate Pleso 37, 69-82. (Selected OrbFit impact solutions for asteroids (99942) Apophis and (144898) 2004VD17)

(10) Wlodarczyk, I. (2008) Contrib. Astron. Obs. Skalnate Pleso 38, 21-32. (The impact orbits of the dangerous asteroid (99942) Apophis)

(11) Binzel, R.P. et al. (2009) Icarus 200, 480-485. (Spectral properties and composition of potentially hazardous Asteroid (99942) Apophis)

(12) Delbo, M. et al. (2007) Icarus 188,266-269. (Albedo and size determination of potentially hazardous asteroids: (99942) Apophis)

(13) Delbo, M. et al. (2007) Icarus 188,266-269. (Albedo and size determination of potentially hazardous asteroids: (99942) Apophis)

(14) Delbo, M. et al. (2007) Icarus 188,266-269. (Albedo and size determination of potentially hazardous asteroids: (99942) Apophis)

(15) R. Behrend Courbes des lumiere, Observatoire de Geneve website

(16) JPL's NEO Radar Detection Program Webpage

(17) Ostro, S.J. et al. (2005) I.A.U. Circ. 8477 (2004 MN_4) Radar observations)

(18) Giorgini, J.D. et al. (2005) I.A.U. Circ. 8593 (99942 Apophis) (radar observations and orbital improvement)

(19) Benner, L.A.M. et al. (2006) I.A.U. Circ. 8711. ((99942) APOPHIS) (radar observations and orbital improvement)

(20) Binzel, R.P. et al. (2006) LPSC 37, 1491. (The MIT-Hawaii-IRTF joint campaign for NEO spectral reconnaissance.)

(21) Binzel, R.P. et al. Webpage

(22) Binzel, R.P. et al. (2009) Icarus 200, 480-485. (Spectral properties and composition of potentially hazardous Asteroid (99942) Apophis)

NEODyS Page of ( 99942) Apophis