375 Ursula

Template:Short description Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = 375 Ursula | image = {{#invoke:InfoboxImage|InfoboxImage|image=375Ursula-LB1.jpg|upright={{#if:||1.1}}|alt=}} | caption = Ursula imaged at amag 11.4 near the star TYC 581-36-1 (magnitude 11.9). The two galaxies are about magnitude 15. | headerstyle = {{#if:#D6D6D6|background-color:#D6D6D6|background-color:#E0CCFF}} | 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 = 124.06 yr (45,314 days) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 3.4544 AU | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = 2.7928 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 = 3.1236 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.1059 | label35 = Template:Longitem | data35 = 5.52 yr (2,016 days) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 189.03° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 15.943° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 336.57° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 342.15° | 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 = | 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 = Template:Val km<ref name="Nugent-2015" />
Template:Val km<ref name="Carry2012"/>
Template:Val km<ref name="AKARI" />
Template:Val km<ref name="Nugent-2016" />
Template:Val km<ref name="Millis-1984" />
216.10 km Template:Small<ref name="lcdb" /> | 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 = Template:Val<ref name="Carry2012"/> | label81 = Template:Longitem | data81 = Template:Val<ref name="Carry2012"/> | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = | label85 = Template:Longitem | data85 = Template:Val h<ref name="lcdb" />
Template:Val h<ref name="Schober-1983e" /><ref name="Schober-1987" />
Template:Val h<ref name="Pilcher-2017f" />
Template:Val h<ref name="Harris-1999a" /> | 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 = Template:Val<ref name="Nugent-2016" />
Template:Val<ref name="Nugent-2015" />
Template:Val<ref name="AKARI" />
0.0494 Template:Small<ref name="lcdb" /> | label94 = Temperature | data94 =

| data100 = {{#if:|

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

}}

| label101 = Surface absorbed dose rate | data101 = | label102 = Surface equivalent dose rate | data102 = | label103 = Template:Longitem | data103 = Tholen = C<ref name="jpldata" />
SMASS = Xc<ref name="jpldata" />
B–V = 0.683<ref name="jpldata" />
U–B = 0.341<ref name="jpldata" /> | label104 = Template:Longitem | data104 = | label105 = Template:Longitem | data105 = | label106 = Template:Longitem | data106 = 7.21<ref name="lcdb" />Template:·Template:Val<ref name="Harris-1999a" /><ref name="Pravec-2012b" />Template:·7.45<ref name="Nugent-2016" />Template:·7.47<ref name="jpldata" /><ref name="Nugent-2015" /><ref name="AKARI" />Template:·Template:Val<ref name="Veres-2015" /> | label107 = Template:Longitem | data107 =

| header110 = Atmosphere

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

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375 Ursula, provisional designation Template:Mp, is a dark asteroid and parent body of the Ursula family from the outer regions of the asteroid belt. It is one of the largest asteroids with a diameter of approximately 200 kilometers. It was discovered on 18 September 1893, by French astronomer Auguste Charlois at Nice Observatory in France.<ref name="MPC-object" /> The referent of the asteroids's name is unknown.<ref name="springer" />

Orbit and classificationEdit

Ursula is the parent body of the Ursula family (Template:Small),<ref name="Ferret" /> a large family of C- and X-type asteroids.<ref name="Nesvorny-2014" />Template:Rp It orbits the Sun in the outer asteroid belt at a distance of 2.8–3.5 AU once every 5 years and 6 months (2,016 days; semi-major axis of 3.12 AU). Its orbit has an eccentricity of 0.11 and an inclination of 16° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins at Vienna Observatory in October 1893, three weeks after its official discovery observation at Nice.<ref name="MPC-object" />

Physical characteristicsEdit

In the Tholen classification, Ursula is a carbonaceous C-type asteroid, while in the SMASS taxonomy, it is a Xc-subtype that transitions to the X-type asteroids.<ref name="jpldata" />

Rotation periodEdit

In January 2017, the so-far best-rated rotational lightcurve of Ursula was obtained from photometric observations by American astronomer Frederick Pilcher at the Organ Mesa Observatory (Template:Small), New Mexico. Lightcurve analysis gave a rotation period of 16.899 hours with a brightness amplitude of 0.11 magnitude (Template:Small).<ref name="Pilcher-2017f" />

Diameter and albedoEdit

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Ursula measures between 189.45 and 215.67 kilometers in diameter and its surface has an albedo between 0.04 and 0.049.<ref name="Nugent-2015" /><ref name="AKARI" /><ref name="Nugent-2016" />

Observations of an occultation on 15 November 1984, produced six chords indicating an estimated diameter of 216±10 km.<ref name="Millis-1984" /> The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0494 and adopts a diameter of 216.1 kilometers based on an absolute magnitude of 7.21.<ref name="lcdb" />

NamingEdit

Any reference of this minor planet's name to a person or occurrence is unknown.<ref name="springer" />

Unknown referentEdit

Among the many thousands of named minor planets, Ursula is one of only 120 for which no official naming citation has been published. All of these asteroids have low numbers between Template:Mp and Template:Mp and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.<ref name="DOMPN-unknown" />

ReferencesEdit

Template:Reflist

External linksEdit

Occultation of UCAC2 12060928 by 375 Ursula, Royal Astronomical Society of New Zealand, 27 May 2008
(375) Ursula, Asteroids and comets rotation curves, Raymond Poncy and Pierre Antonini (2006), Geneva Observatory
Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
Dictionary of Minor Planet Names, Google books
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
Template:AstDys
Template:JPL small body

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