1627 Ivar

1627 Ivar

Light-curve-based 3D-model of 1627 Ivar
Discovery [1]
Discovered by E. Hertzsprung
Discovery site Johannesburg Obs.
(Leiden Southern Station)
Discovery date 25 September 1929
Designations
MPC designation 1627 Ivar
Named after
 Ivar Hertzsprung
(discoverer's brother)[2]
1929 SH · 1957 NA
1957 XA
Amor, NEO
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 85.71 yr (31305 days)
Aphelion 2.6016 AU (389.19 Gm)
Perihelion 1.1243 AU (168.19 Gm)
1.8629 AU (278.69 Gm)
Eccentricity 0.39650
2.54 yr (928.74 d)
356.39°
0° 23m 15.432s / day
Inclination 8.4511°
133.15°
167.79°
Earth MOID 0.110404 AU (16.5162 Gm)
Jupiter MOID 2.64726 AU (396.024 Gm)
Jupiter Tisserand parameter 3.880
Physical characteristics
Dimensions 9.12 km[3]
10.2 km[4]
9.9±2.8 km[5]
8.370±0.075 km[6]
Mean radius
 4.56 km
4.795 h (0.1998 d)[1][7][8]
4.796 h[9]
4.798 h[10]
4.797 h[11]
4.798 h[12]
4.80 h[13]
4.795170 h[14]
4.7954±0.006 h[15]
4.7961±0.0001 h[16]
4.79517±0.00005 h[17]
0.15[1][3][18]
0.117[4]
0.128±0.123[5]
0.09±0.12[19]
0.134±0.025[6]
0.151 (taken)[20]
B–V = 0.872
U–B = 0.459
S (Tholen), S (SMASS)
S [20]
13.2

    1627 Ivar, provisional designation 1929 SH, is a large, stony and eccentric asteroid classified as near-Earth object and Amor asteroid, that measures about 9 kilometers in diameter. It was discovered on 25 September 1929 by Danish astronomer Ejnar Hertzsprung at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa.[21]

    The S-type asteroid orbits the Sun at a distance of 1.1–2.6 AU once every 2.54 years (929 days). Its orbit shows a high eccentricity of 0.40 and is tilted by 8 degrees to the plane of the ecliptic. It has a rotation period of 4.80 hours and an albedo around 0.15.[3][18] In 1985, the body was observed with radar from the Arecibo Observatory in Puerto Rico at a distance of 0.20 AU. The measured radar cross-section was 7.5 square kilometers.[22]

    Although, as an Amor asteroid, it is a Mars-crosser, that does not cross the orbit of Earth, it has a low Earth minimum orbit intersection distance (MOID) of 0.1122 AU. In 2074, it will pass Earth at 0.141 AU, closer than it actually approached Mars in 1975 (0.150 AU).

    The minor planet was named by the discoverer in honor of his late brother Ivar Hertzsprung.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1627 Ivar (1929 SH)" (2015-06-11 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1627) Ivar. Springer Berlin Heidelberg. p. 129. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 Delbó, Marco; Harris, Alan W.; Binzel, Richard P.; Pravec, Petr; Davies, John K. (November 2003). "Keck observations of near-Earth asteroids in the thermal infrared". Icarus 166 (1): 116–130. Bibcode:2003Icar..166..116D. doi:10.1016/j.icarus.2003.07.002. Retrieved November 2015.
    4. 1 2 Harris, Alan W. (February 1998). "A Thermal Model for Near-Earth Asteroids". Icarus 131 (2): 291–301. Bibcode:1998Icar..131..291H. doi:10.1006/icar.1997.5865. Retrieved November 2015.
    5. 1 2 Mueller, Michael; Delbo', M.; Hora, J. L.; Trilling, D. E.; Bhattacharya, B.; Bottke, W. F.; et al. (April 2011). "ExploreNEOs. III. Physical Characterization of 65 Potential Spacecraft Target Asteroids". The Astronomical Journal 141 (4): 9. Bibcode:2011AJ....141..109M. doi:10.1088/0004-6256/141/4/109. Retrieved November 2015.
    6. 1 2 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved November 2015.
    7. ↑ Pravec, Petr; Sarounová, Lenka; Wolf, Marek (December 1996). "Lightcurves of 7 Near-Earth Asteroids". Icarus 124 (2): 471–482. Bibcode:1996Icar..124..471P. doi:10.1006/icar.1996.0223. Retrieved November 2015.
    8. ↑ Warner, Brian D. (July 2015). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 January - March". The Minor Planet Bulletin 42 (3): 172–183. Bibcode:2015MPBu...42..172W. ISSN 1052-8091. Retrieved November 2015.
    9. ↑ Harris, A. W.; Young, J. W. (June 1985). "Photometric Results for Earth Approaching Asteroids.". Bulletin of the American Astronomical Society 17. Bibcode:1985BAAS...17R.726H. Retrieved November 2015.
    10. ↑ Lupishko, D. F.; Velichko, F. P.; Shevchenko, V. G. (October 1986). "The asteroid 1627 Ivar - UBV photometry, period, and sense of rotation". Kinematika i Fizika Nebesnykh Tel: 39–43. Bibcode:1986KFNT....2...39L. ISSN 0233-7665. Retrieved November 2015.
    11. ↑ Hahn, G.; Magnusson, P.; Harris, A. W.; Young, J. W.; Belkora, L. A.; Fico, N. J.; et al. (April 1989). "Physical studies of Apollo-Amor asteroids - UBVRI photometry of 1036 Ganymed and 1627 Ivar". Icarus: 363–381. Bibcode:1989Icar...78..363H. doi:10.1016/0019-1035(89)90184-X. ISSN 0019-1035. Retrieved November 2015.
    12. ↑ Kiss, L. L.; Szabó, Gy.; Sárneczky, K. (November 1999). "CCD photometry and new models of 5 minor planets". Astronomy and Astrophysics Supplement. arXiv:astro-ph/9909159. Bibcode:1999A&AS..140...21K. doi:10.1051/aas:1999115. Retrieved November 2015.
    13. ↑ Szabo, Gyula; Kiss, Laszlo L. (February 2001). "CCD photometric investigations of small bodies in the solar system". Publications of the Astronomy Department of the Eötvös University (11): 119. Bibcode:2001PADEU..11..119S. Retrieved November 2015. PDF: http://astro.elte.hu/phd2000/szabogy.pdf
    14. ↑ Kaasalainen, Mikko; Pravec, Petr; Krugly, Yurij N.; Sarounová, Lenka; Torppa, Johanna; Virtanen, Jenni; et al. (January 2004). "Photometry and models of eight near-Earth asteroids". Icarus 167 (1): 178–196. Bibcode:2004Icar..167..178K. doi:10.1016/j.icarus.2003.09.012. Retrieved November 2015.
    15. ↑ Skiff, Brian A.; Bowell, Edward; Koehn, Bruce W.; Sanborn, Jason J.; McLelland, Kyle P.; Warner, Brian D. (July 2012). "Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) - 2008 May through 2008 December". The Minor Planet Bulletin 39 (3): 111–130. Bibcode:2012MPBu...39..111S. ISSN 1052-8091. Retrieved November 2015.
    16. ↑ Warner, Brian D. (January 2014). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2013 June-September". The Minor Planet Bulletin 41 (1): 41–47. Bibcode:2014MPBu...41...41W. ISSN 1052-8091. Retrieved November 2015.
    17. ↑ Hanus, J.; Delbo', M.; Durech, J.; Alí-Lagoa, V. (August 2015). "Thermophysical modeling of asteroids from WISE thermal infrared data - Significance of the shape model and the pole orientation uncertainties". Icarus 256: 101–116. arXiv:1504.04199. Bibcode:2015Icar..256..101H. doi:10.1016/j.icarus.2015.04.014. Retrieved November 2015.
    18. 1 2 Mainzer, A.; Grav, T.; Masiero, J.; Bauer, J.; Wright, E.; Cutri, R. M.; et al. (August 2011). "Thermal Model Calibration for Minor Planets Observed with Wide-field Infrared Survey Explorer/NEOWISE". The Astrophysical Journal 736 (2): 9. Bibcode:2011ApJ...736..100M. doi:10.1088/0004-637X/736/2/100. Retrieved November 2015.
    19. ↑ Thomas, C. A.; Trilling, D. E.; Emery, J. P.; Mueller, M.; Hora, J. L.; Benner, L. A. M.; et al. (September 2011). "ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population". The Astronomical Journal 142 (3): 12. Bibcode:2011AJ....142...85T. doi:10.1088/0004-6256/142/3/85. Retrieved November 2015.
    20. 1 2 "LCDB Data for (1627) Ivar". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    21. ↑ "1627 Ivar (1929 SH)". Minor Planet Center. Retrieved November 2015.
    22. ↑ Ostro, S. J.; Jurgens, R. F.; Rosema, K. D.; Winkler, R.; Yeomans, D. K.; Campbell, D. B.; et al. (October 1991), "Asteroid radar astrometry", Astronomical Journal 102, pp. 1490–1502, Bibcode:1991AJ....102.1490O, doi:10.1086/115975

    External links

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