(99907) 1989 VA

Template:Short description Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = Template:Mp | image = {{#invoke:InfoboxImage|InfoboxImage|image=|upright={{#if:||1.1}}|alt=}} | caption = | headerstyle = {{#if:#FFC2E0|background-color:#FFC2E0|background-color:#E0CCFF}}; color:inherit; | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y

| header1 = Discovery<ref name="jpldata" />

| header10 = {{#if:|Designations|Designations}}

| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}}<ref name="jpldata" />

| data21 = | data22 = {{#if:4 September 2017 (JD 2458000.5) |Epoch 4 September 2017 (JD 2458000.5)}} | data23 = {{#if:0 | Uncertainty parameter 0}} | label24 = Observation arc | data24 = 26.16 yr (9,555 days) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 1.1616 AU | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = 0.2952 AU | label28 = Peri{{#if:|{{{apsis}}}|apsis}} | data28 = | label29 = {{#switch:{{{apsis}}} |helion|astron=Ap{{{apsis}}} |Apo{{#if:|{{{apsis}}}|apsis}}}} | data29 = | label30 = Periastron | data30 = | label31 = Apoastron | data31 = | label32 = Template:Longitem | data32 = 0.7284 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.5947 | label35 = Template:Longitem | data35 = 0.62 yr (227 days) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 79.277° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 28.801° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 225.60° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 2.8461° | label46 = Template:Nowrap | data46 = | label47 = Satellite of | data47 = | label48 = Group | data48 = | label49 = {{#switch: |yes|true=Satellites |Known satellites}} | data49 = | label50 = Star | data50 = | label51 = Earth MOID | data51 = 0.1552 AUTemplate:·60.5 LD | label52 = Mercury MOID | data52 = | label53 = Venus MOID | data53 = | label54 = Mars MOID | data54 = | label55 = Jupiter MOID | data55 = | label56 = Saturn MOID | data56 = | label57 = Uranus MOID | data57 = | label58 = Neptune MOID | data58 = | label59 = T_Jupiter | data59 =

| header60 = Proper orbital elements

| label61 = Template:Longitem | data61 = {{#if: |{{{p_semimajor}}} AU}} | label62 = Template:Longitem | data62 = | label63 = Template:Longitem | data63 = | label64 = Template:Longitem | data64 = {{#if: |{{{p_mean_motion}}} deg Template:\yr}} | label65 = Template:Longitem | data65 = {{#if:|{{#expr:360/1 round 5}} yr
({{#expr:365.25*360/1 round 3}} d) }} | label66 = Template:Longitem | data66 = {{#if:|{{{perihelion_rate}}} arcsec Template:\yr }} | label67 = Template:Longitem | data67 = {{#if:|{{{node_rate}}} arcsec Template:\yr}}

| header70 = Template:Anchor{{#if:yes| Physical characteristics|Physical characteristics}}

| label71 = Dimensions | data71 = 0.547 km Template:Small<ref name="lcdb" />
Template:Val km<ref name="Campins-2009a" />
1.4 km<ref name="jpldata" /> | label72 = Template:Longitem | data72 = | label73 = Template:Longitem | data73 = | label74 = Template:Longitem | data74 = | label75 = Template:Longitem | data75 = | label76 = Flattening | data76 = | label77 = Circumference | data77 = | label78 = Template:Longitem | data78 = | label79 = Volume | data79 = | label80 = Mass | data80 = | label81 = Template:Longitem | data81 = | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = | label85 = Template:Longitem | data85 = 2.514 h<ref name="Pravec-1997c" /> | label86 = Template:Longitem | data86 = | label87 = Template:Longitem | data87 = | label88 = Template:Longitem | data88 = | label89 = Template:Longitem | data89 = | label90 = Template:Longitem | data90 = | label91 = Template:Longitem | data91 = | label92 = Template:Longitem | data92 = | label93 = {{#if:yes |Template:Longitem |Albedo}} | data93 = 0.3718 Template:Small<ref name="lcdb" />
Template:Val<ref name="Campins-2009a" /> | label94 = Temperature | data94 =

| data100 = {{#if:|

Surface temp.	min	mean	max
{{{temp_name1}}}
{{{temp_name2}}}
{{{temp_name3}}}
{{{temp_name4}}}

}}

| header110 = Atmosphere

| below = {{#if:||Template:Reflist }}

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Template:Mp (provisional designation Template:Mp) 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.<ref name="MPC-object" />

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.<ref name="Campins-2009a" /><ref name="lcdb" /><ref name="Pravec-1997c" /> 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 Template:Mp, with an eccentricity of 0.665 – have been discovered.<ref name=MPCatenlist /> 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 Template:Mp (0.683 AU),<ref name=MPCatenlist /> 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 Template:Mp 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.<ref name="Christou-2000" /><ref name="Fuente-2013" /> Currently, the only known Venus co-orbitals are Template:Mpl, Zoozve and Template:Mpl (as of 18 March 2013). Of the seven known objects in Venus' zone of influence, Template:Mp is the largest at about 1,400 metres. All of these objects, like Template:Mp, 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 Template:Mp 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 Template:Mpl (0.277 AU) was discovered that an Aten asteroid with a lower perihelion was found. Template:Mp'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, Template:Mp is characterized as a Sq-subtype that fall into the broader class of stony S-type asteroids.<ref name=jpldata />

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 22 June 2005.<ref name="MPC-Circulars-Archive" /> As of 2018, it has not been named.<ref name="MPC-object" />

References

Template:Reflist

External links

Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
Template:NeoDys
Template:ESA-SSA
Template:JPL small body

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(99907) 1989 VA

Contents

Orbit and classification

Physical characteristics

Numbering and naming

References

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(99907) 1989 VA

Orbit and classification

Physical characteristics

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