(99907) 1989 VA

Last updated

(99907) 1989 VA
Discovery [1]
Discovered by C. S. Shoemaker
E. M. Shoemaker
D. H. Levy
Discovery site Palomar Obs.
Discovery date2 November 1989
Designations
(99907) 1989 VA
NEO  · Aten [1] [2]  · Mercury-grazer  · Venus-crosser  · Earth-crosser
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 26.16 yr (9,555 days)
Aphelion 1.1616 AU
Perihelion 0.2952 AU
0.7284 AU
Eccentricity 0.5947
0.62 yr (227 days)
79.277°
1° 35m 7.44s / day
Inclination 28.801°
225.60°
2.8461°
Earth  MOID 0.1552 AU ·60.5 LD
Physical characteristics
Dimensions0.547 km (derived) [3]
0.55±0.06 km [4]
1.4 km [1]
2.514 h [5]
0.3718 (derived) [3]
0.40±0.30 [4]
SMASS = Sq [1]  · S [3]
17.9 [1]

    (99907) 1989 VA (provisional designation 1989 VA) is a very eccentric, stony asteroid and near-Earth object, approximately 1 kilometer in diameter. It was discovered on 2 November 1989, by American astronomer couple Carolyn and Eugene Shoemaker and Canadian astronomer David Levy at the Palomar Observatory on Mount Palomar, California. [2]

    Contents

    Orbit and classification

    It is a member of the Aten asteroid, a subgroup of near-Earth objects that are located in the zone of influence of Venus. It has frequent, relatively close encounters with the Earth, as its minimum orbit intersection distance (MOID) is 0.16 AU or about 23 million kilometers. It was the eighth Aten asteroid discovered. Since then the number of Atens has grown to about one thousand known bodies.

    This asteroid orbits the Sun with a short orbital period at a distance of 0.3–1.2 AU once every 227 days. The body rotates every two and a half hours around its axis and has a notably high albedo of about 0.40. [4] [3] [5] Its orbit is tilted by 29 degrees to the plane of the ecliptic. With an exceptionally high eccentricity of 0.59, it was the most eccentric Aten asteroid known at the time of discovery, more eccentric than previously discovered Aten, 3753 Cruithne. Since then, more eccentric Atens – such as (162004) 1991 VE, with an eccentricity of 0.665 – have been discovered. [6] Due to this elongated orbit, the Aten asteroid and near-Earth asteroid also classifies as Earth-crosser, Venus-crosser and Mercury-grazer.

    1989 VA was the first asteroid discovered with such a small semi-major axis (0.728 AU, about the same as Venus), breaking 2100 Ra-Shalom's distance record (0.832 AU), which had held for over a decade. It remained the asteroid with the smallest known semi-major axis for five years until the discovery of 1994 GL (0.683 AU), [6] which was the first asteroid discovered closer to the Sun than Venus.

    Being so close to Venus, it is also the first asteroid discovered within Venus' zone of influence. This means that it is close enough to Venus for the planet to capture 1989 VA into a co-orbital relationship. Though it is not a Venus co-orbital at the moment, it may become one in the future and may have been one in the past. [7] [8] Currently, the only known Venus co-orbitals are 2001 CK32 , Zoozve and 2012 XE133 (as of 18 March 2013). Of the seven known objects in Venus' zone of influence, 1989 VA is the largest at about 1,400 metres. All of these objects, like 1989 VA, have eccentric orbits that cross Mercury's and Earth's orbits as well.

    The combination of a small semi-major axis and high eccentricity made 1989 VA the first Aten asteroid discovered to get closer to the Sun (0.295 AU) than Mercury ever does. 2340 Hathor (the second Aten discovered, in 1976) had the smallest perihelion (0.464 AU) earlier, which was about the same distance as Mercury's aphelion (0.467 AU). It was not until (66063) 1998 RO1 (0.277 AU) was discovered that an Aten asteroid with a lower perihelion was found. 1989 VA's eccentric orbit takes it out past the Earth, where it has encounters of about 0.15 to 0.20 AU about every 3 to 5 years around October–November. It was discovered during its 1989 encounter and was about 0.17 AU away at the time. Further observations were made in October 2002 and during the most recent close encounter in November 2007.

    Physical characteristics

    In the SMASS taxonomy, 1989 VA is characterized as a Sq-subtype that fall into the broader class of stony S-type asteroids. [1]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 22 June 2005. [9] As of 2018, it has not been named. [2]

    Related Research Articles

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    (434326) 2004 JG6, provisional designation 2004 JG6, is an eccentric, sub-kilometer sized asteroid, classified as near-Earth object and potentially hazardous asteroid of the Atira group. It is one of the closest orbiting objects to the Sun. While its perihelion lies within the orbit of Mercury its orbital trajectory is highly elliptical, causing its aphelion to cross the orbit of Venus. Therefore, it does not fit the criteria for a vulcanoid or ꞋAylóꞌchaxnim asteroid, which would require it have a wholly intra-Mercurian and intra-Venusian orbit respectively.

    <span class="nowrap">(33342) 1998 WT<sub>24</sub></span> Sub-kilometer asteroid

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    <span class="mw-page-title-main">524522 Zoozve</span> Temporary quasi-satellite of Venus

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    <span class="mw-page-title-main">3752 Camillo</span>

    3752 Camillo is an inclined contact-binary asteroid, classified as near-Earth object of the Apollo group, approximately 2.3 kilometers in diameter. It was discovered on 15 August 1985, by astronomers Eleanor Helin and Maria Barucci using a 0.9-metre (35 in) telescope at the CERGA Observatory in Caussols, France. Lightcurve studies by Petr Pravec in 1998 suggest that the assumed S-type asteroid has an elongated shape and a longer-than average rotation period of 38 hours.

    <span class="mw-page-title-main">163693 Atira</span> Asteroid

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    2012 XE133 is an asteroid, classified as near-Earth object of the Aten group that is a temporary co-orbital of Venus.

    <span class="nowrap">(66063) 1998 RO<sub>1</sub></span> Stony near-Earth object of the Aten group

    (66063) 1998 RO1 is a stony near-Earth object of the Aten group on a highly-eccentric orbit. The synchronous binary system measures approximately 800 meters (0.50 miles) in diameter. It was discovered by astronomers of the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, on 14 September 1998.

    2013 ND15 (also written 2013 ND15) is an asteroid that is a temporary trojan of Venus, the first known Venus trojan.

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    (386454) 2008 XM is a highly eccentric, sub-kilometer-sized asteroid, with one of the smallest known perihelions among all minor planets. It is classified as near-Earth object of the Apollo group and was discovered on 2 December 2008, by the LINEAR program at Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, United States.

    (391211) 2006 HZ51 is a bright, sub-kilometer asteroid on an eccentric orbit, classified as a near-Earth object and a potentially hazardous asteroid of the Amor group. It was discovered on 27 April 2006, by astronomers of the Catalina Sky Survey conducted at Mount Lemmon Observatory, Arizona, United States. During preliminary observations, it was thought to have a small chance of impacting Earth in 2008. The asteroid measures approximately half a kilometer in diameter and has an exceptionally high albedo.

    (456938) 2007 YV56, provisional designation 2007 YV56, is a sub-kilometer asteroid on an eccentric orbit, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 190–360 meters (620–1,200 ft) in diameter. It was discovered on 31 December 2007, by astronomers of the Catalina Sky Survey conducted at the Catalina Station in Arizona, United States.

    (85182) 1991 AQ is a stony asteroid on a highly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.1 kilometers in diameter. It was discovered on 14 January 1991, by American astronomer Eleanor Helin at the Palomar Observatory in California. Based on its brightness variation of 0.69 magnitude, this Q-type asteroid is likely elongated. It belongs to the small group of potentially hazardous asteroids larger than one kilometer.

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    594913 ꞌAylóꞌchaxnim (provisional designation 2020 AV2) is a large near-Earth asteroid discovered by the Zwicky Transient Facility on 4 January 2020. It is the first asteroid discovered to have an orbit completely within Venus's orbit, and is thus the first and only known member of the eponymous ꞌAylóꞌchaxnim (informally named Vatira before its discovery) population of Atira-class asteroids. ꞌAylóꞌchaxnim has the smallest known aphelion and third-smallest known semi-major axis among all asteroids. With an absolute magnitude approximately 16.2, the asteroid is expected to be larger than 1 km in diameter.

    2019 BE5 is a sub-kilometer near-Earth asteroid classified under the Aten group. It was discovered on 31 January 2019, by the Zwicky Transient Facility at the Palomar Observatory. The asteroid was discovered one day after it had made a close approach to Earth from a distance of 0.00784 AU (1.173 million km; 3.05 LD).

    2020 SW is a tiny near-Earth asteroid discovered by the Mount Lemmon Survey on 18 September 2020, six days before it made its closest approach to Earth. The asteroid passed within 21,600 kilometres (13,400 mi) from Earth's surface on 24 September 2020 11:13 UT, within the geostationary altitude of 36,000 kilometres (22,000 mi). The encounter with Earth perturbed the asteroid's heliocentric trajectory from an Apollo-type orbit to an Aten-type orbit with a semi-major axis within one astronomical unit from the Sun. As a result, the asteroid will not make any close approaches to Earth within 0.01 astronomical units (4 LD) in the next 200 years.

    <span class="nowrap">(231937) 2001 FO<sub>32</sub></span> Asteroid

    (231937) 2001 FO32 is a near-Earth asteroid classified as a potentially hazardous asteroid of the Apollo group. With an estimated diameter around 550 m (1,800 ft), it was discovered by the Lincoln Near-Earth Asteroid Research at Socorro, New Mexico on 23 March 2001. The asteroid safely passed by Earth on 21 March 2021 16:03 UTC from a closest approach distance of 0.0135 AU (2.02 million km; 1.25 million mi), or 5.25 lunar distances (LD). During the day before closest approach, 2001 FO32 reached a peak apparent magnitude of 11.7 and was visible to ground-based observers with telescope apertures of at least 20 cm (8 in). It is the largest and one of the fastest asteroids to approach Earth within 10 LD (3.8 million km; 2.4 million mi) in 2021.

    <span class="nowrap">2021 PH<sub>27</sub></span> Near-Earth asteroid of the Atira group

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    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 99907 (1989 VA)" (2015-12-31 last obs.). Jet Propulsion Laboratory . Retrieved 1 June 2017.
    2. 1 2 3 "99907 (1989 VA)". Minor Planet Center. Retrieved 3 December 2015.
    3. 1 2 3 4 "LCDB Data for (99907)". Asteroid Lightcurve Database (LCDB). Retrieved 3 December 2015.
    4. 1 2 3 Campins, Humberto; Kelley, Michael S.; Fernández, Yanga; Licandro, Javier; Hargrove, Kelsey (September 2009). "Low Perihelion Near-Earth Asteroids". Earth. 105 (2–4): 159–165(EM&PHomepage). Bibcode:2009EM&P..105..159C. doi:10.1007/s11038-009-9310-2. S2CID   119771719 . Retrieved 3 December 2015.
    5. 1 2 Pravec, P.; Wolf, M.; Sarounová, L.; Mottola, S.; Erickson, A.; Hahn, G.; Harris, A. W.; Harris, A. W.; Young, J. W. (December 1997). "The Near-Earth Objects Follow-Up Program". Icarus. 130 (2): 275–286. Bibcode:1997Icar..130..275P. doi:10.1006/icar.1997.5816 . Retrieved 3 December 2015.
    6. 1 2 List Of Aten Minor Planets
    7. ↑ Christou, Apostolos A. (March 2000). "A Numerical Survey of Transient Co-orbitals of the Terrestrial Planets". Icarus. 144 (1): 1–20. Bibcode:2000Icar..144....1C. doi:10.1006/icar.1999.6278 . Retrieved 3 December 2015.
    8. ↑ de la Fuente Marcos, C.; de la Fuente Marcos, R. (June 2013). "Asteroid 2012 XE133: a transient companion to Venus". Monthly Notices of the Royal Astronomical Society. 432 (2): 886–893. arXiv: 1303.3705 . Bibcode:2013MNRAS.432..886D. doi:10.1093/mnras/stt454 . Retrieved 3 December 2015.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
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