( 1620) Geographos

(1951 RA = 1983 CY3 )

Discovery Circumstances:

A. G. Wilson, R. Minkowski - Palomar Mountain

14 Sep 1951

(1)

Orbital Type:

AP

(*)( 2)( 3)( 4)( 5)( 6)( 7)( 8)( 9)(10)(11)

Taxonomic Type:

S

(12)(13)(14)(15)(16)

Albedo:

0.19

(17)(18)(19)

Diameter:(km)

5x2x1.5 km

(20)(21)

H:(mag)

16.5

(22)

G:

0.15

(#)

U-B:(mag)

0.50

(23)

B-V:(mag)

0.89

(23)

V-R:(mag)

-

-

R-I:(mag)

-

-

Rotation Period:(hrs)

5.2233

(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)

Quality:

4 !

(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)

Lightcurve Amplitude:(mag)

1.10-2.03

(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)

Spin Vector:

l= 55,b=-45

(40)(41)

Sense of Rotation:

ret

(42)(43)

Radar Observations:

Y

(44)(45)(46)(47)(48)

Spectral Observations:

Y

(49)(50)(51)(52)(53)(54)

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) I.A.U.Circ. 1326

(002) Milani, A. et al. (1989) Icarus 78, 212-269. (Dynamics of planet-crossing asteroids - Classes of orbital behavior - project Spaceguard)

(003) Hahn, G. & C.-I. Lagerkvist (1988) Celest. Mech. 43, 285-302. (Orbital evolution studies of planet-crossing asteroids)

(004) Hahn, G. & C.-I. Lagerkvist (1988) in "The Few Body Problem" (Ed.M.J. Valtonen), Kluwer Acad. Publ., Dordrecht, Netherlands, pp. 143-146. (Long-term orbital evolution studies of Aten-Apollo-Amor objects)

(005) Bottke, W.F. et al. (1999) Astron. J. 117, 1921-1928. (1620 Geographos and 433 Eros: shaped by planetary tides?)

(006) Durech, J. et al. (2008) ACM2008, 8392. (DETECTION OF THE YORP EFFECT ON ASTEROID (1620) GEOGRAPHOS)

(007) Dave, R. et al. (2010) DPS 42, 1324. (abstract) (Thermal Emission Spectroscopy (5.2 To 38 Microns) And Analysis Of 10 Near-earth Asteroids) (1612,1580,433,2212,1685,1917,1566,3200,7092,1866)

(008) Bottke, W.F. & D.C, Richardson (1997) B.A.A.S.29, 965. 05.06. (Has 1620 Geographos been reshaped by planetary tides?)

(009) Nugent, C.R. et al. (2012) Astron. J. 144, 60. (DETECTION OF SEMIMAJOR AXIS DRIFTS IN 54 NEAR-EARTH ASTEROIDS: NEW MEASUREMENTS OF THE YARKOVSKY EFFECT) (54 NEAs)

(010) Ness, R.G. & J.P. Emery (2014) LPSC 45, 1430. (Thermal Inertia Estimates of Four Near-Earth Asteroids from Spitzer Space Telescope Spectral Observations)(1580,1620,1685,1862)

(011) Rozitis, B. & S.F. Green (2014) Astron. Astrophys. 568, A43. (Physical characterisation of near-Earth asteroid (1620) Geographos. Reconciling radar and thermal-infrared observations)

(012) Tholen, D.J. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1139-1150.

(013) Hicks, M.D. et al. (1998) Icarus 133, 69-78. (The Unusual Spectra of 15 Near-Earth Asteroids and Extinct Comet Candidates)(1566,1620,2063,2102,2201,3200,4953,6053,6489,7092,8176,1994ES1,1995CR,1996JA1 )

(014) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.)

(015) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)

(016) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)

(017) Ostro, S.J. et al. (1996) Icarus 121, 46-66. (Radar Observations of Asteroid 1620 Geographos)

(018) Veeder, G.J. et al. (1989) Astron. J. 97, 1211-1219. (Radiometry of near-earth asteroids)

(019) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs)

(020) Veeder, G.J. et al. (1989) Astron. J. 97, 1211-1219. (Radiometry of near-earth asteroids)

(021) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs)

(022) Magnusson, P. et al. (1996) Icarus 123, 227-244. (Photometric Observations and Modeling of Asteroid 1620 Geographos)

(023) Tedesco, E.F. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1090-1138.

(024) Magnusson, P. et al. (1996) Icarus 123, 227-244. (Photometric Observations and Modeling of Asteroid 1620 Geographos)

(025) Krugly, Yu. N. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 903-906. (CCD photometry of Near-Earth asteroids in 2001) (rot.per. for 719,1916,26760,33342 2001 MF1; LCs for 1620,3103,5587,1999 K W4)

(026) Dunlap, J.L. (1974) Astron. J. 79, 324-332. (Minor planets and related objects. XV. Asteroid (1620) Geographos)

(027) Weidenschilling, S.J. et al. (1990) Icarus 86, 402-447. (Photometric geodesy of main-belt asteroids. III - Additional lightcurves)(.1620..)

(028) Michalowski, T. et al. (1994) Acta Astron. 44, 223-226. (CCD photometry of asteroid 1620)

(029) Kwiatkowski, T. (1995) Astron. & Astrophys. 294, 274-277. (Sideral period, pole and shape of asteroid 1620 Geograhos)

(030) Prokofeva, V.V. et al. (1997) Pis'ma Astronomicheskii Zhurnal 23, 870-880; Engl. Trans. Astron. Lett. 23, 758-767. (1620)

(031) Harris, A.W. (DLR) (1998) Icarus 131, 291-301. (A Thermal Model for Near-Earth Asteroids)

(032) Karachkina, L.G. (1998) Astron. Vestn. 32, 327-339; Engl. Trans. Solar System Res. 32, 287-289. (Modulation of brightness of asteroid 1620 Geographos)

(033) Hudson, R. S. & S. J. Ostro. (1999) Icarus 140, 369-378. (Physical model of asteroid 1620 Geographos from radar and optical data.)

(034) Kaasalainen, M. et al. (2001) Icarus 153, 37-51. (Optimization Methods for Asteroid Lightcurve Inversion)

(035) Krugly, Yu. N. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 903-906. (CCD photometry of Near-Earth asteroids in 2001) (rot.per. for 719,1916,26760,33342 2001 MF1; LCs for 1620,3103,5587,1999 KW4)

(036) Durech, J. et al. (2008) Astron. Astrophys. 489, L25-L28. (Detection of the YORP effect in asteroid (1620) Geographos)

(037) Ye, Q. et al. (2009) MPB 36, 126. (CCD LIGHTCURVE ANALYSIS OF (53430) 1999 TY16)

(038) Skiff, B.A. et al. (2012) MPB 39, 111-130. (LOWELL OBSERVATORY NEAR-EARTH ASTEROID PHOTOMETRIC SURVEY (NEAPS) - 2008 MAY THROUGH 2008 DECEMBER) (46 NEAs)

(039) Warner, B.D. (2016) MPB 43, 143-154. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2015 OCTOBER-DECEMBER)(36NEAs)

(040) Kaasalainen, M. et al. (2001) Icarus 153, 37-51. (Optimization Methods for Asteroid Lightcurve Inversion)

(041) Kwiatkowski, T. (1995) Astron. & Astrophys. 294, 274-277. (Sideral period, pole and shape of asteroid 1620 Geograhos)

(042) Kaasalainen, M. et al. (2001) Icarus 153, 37-51. (Optimization Methods for Asteroid Lightcurve Inversion)

(043) Kwiatkowski, T. (1995) Astron. & Astrophys. 294, 274-277. (Sideral period, pole and shape of asteroid 1620 Geograhos)

(044) Hudson, R.S. & S.J. Ostro (1997) B.A.A.S 29, 966. (Recent Radar Modeling Results: 1620 Geographos and 4179 Toutatis)

(045) Ostro, S.J. et al. (1995) Nature 375, 474. (Extreme elongation of asteroid 1620 geographos from radar images)

(046) Ostro, S.J. et al. (1996) Icarus 121, 46-66. (Radar Observations of Asteroid 1620 Geographos)

(047) Ostro, S.J. et al. (1991) Astron. J. 102, 1490-1502. (Asteroid radar astrometry)

(048) Hudson, R. S. & S. J. Ostro. (1999) Icarus 140, 369-378. (Physical model of asteroid 1620 Geographos from radar and optical data.)

(049) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.)

(050) Hicks, M.D. et al. (1995) Icarus 113, 456-459. (Rotationally resolved spectra of 1620 Geographos)

(051) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)

(052) Hicks, M.D. et al. (1998) Icarus 133, 69-78. (The Unusual Spectra of 15 Near-Earth Asteroids and Extinct Comet Candidates)(1566,1620,2063,2102,2201,3200,4953,6053,6489,7092,8176,1994ES1,1995CR,1996JA1)

(053) Fevig. R.A. and U. Fink (2007) Icarus 188, 175-188. (Spectral observations of 19 weathered and 23 fresh NEAs and their correlations with orbital parameters)(433,1036,1627,1685,1862,1866,1943,1980,3103 ,3122,3199,3671,4183,4341,4954,5587,5751,5836,6037,7358,7482,7753,7822,7977,8201,10563,11066,13651,13651,19356,20236,20255,35107,85490,J97GD32,J97UH9,J97US9,J98HE3,J98HT31,J98ME3,J98MS2,K04LC2)

(054) Sanchez, J.A. et al. (2012) Icarus 220, 36-50. (Phase reddening on near-Earth asteroids: Implications for mineralogical analysis, space weathering and taxonomic classification) (1036,1620,1627,1862,1980,4179,4954,6239,11398,25143,35107,66146)


NEODyS Page of ( 1620) Geographos