Changes

{{Minor Planet

{{Infobox planet

  | name=728 Leonisis

  | name=728 Leonisis

  | discoverer=[[J. Palisa]]

  | discoverer=[[J. Palisa]]

  | discovery_date=[[February 16]], [[1912]]

  | discovered=16 February 1912

  | designations=1912 NU; A907 UE;<br />1941 WR; 1968 UT

  | mpc_name=(728) Leonisis

  | category=[[Asteroid belt|Main belt]] ([[Flora family]])

| alt_names=1912 NU; A907 UE;<br />1941 WR; 1968 UT

  | epoch=[[August 8]], [[2005]] ([[Julian day|JD]] 2453600.5)

  | pronounced= {{IPAc-en|l|iː|ə|'|n|aɪ|s|ᵻ|s}}<!--per Leon+Isis-->

  | semimajor=337.2 [[Giga|G]][[metre|m]] (2.254 [[Astronomical unit|AU]])

| mp_category=[[Asteroid belt|Main belt]] ([[Flora family]])

  | perihelion=307.7 Gm (2.057 AU)

  | orbit_ref=<ref name="JPL">{{Citation

  | aphelion=366.7 Gm (2.451 AU)

  | eccentricity=0.0873

  | period=1236.0 [[day|d]] (3.38 [[Julian year (astronomy)|a]])

  | inclination=4.258[[degree (angle)|°]]

  | asc_node=82.701°

| publisher = [[NASA Jet Propulsion Laboratory]]

  | arg_peri=55.194°

  | mean_anomaly=232.528°

  | speed=19.80 km/[[second|s]]

  | dimensions=''unknown''

  | mass=''unknown''

| epoch=31 July 2016 ([[Julian day|JD]] 2457600.5)

  | density=''unknown''

  | semimajor={{Convert|2.2535|AU|Gm|abbr=on}}

  | gravity=''unknown''

  | perihelion={{Convert|2.0561|AU|Gm|abbr=on}}

  | escape_velocity=''unknown''

  | aphelion={{Convert|2.4509|AU|Gm|abbr=on|lk=on}}

  | rotation=~0.2 d (~5 [[hour|h]])<ref>[http://www.psi.edu/pds/archive/lc.html]</ref>

  | eccentricity=0.087584

  | spectral_class=[[A-type asteroid|A]] or  [[L-type asteroid|Ld]]

  | period=3.38 [[Julian year (astronomy)|yr]] (1235.6 [[Julian year (astronomy)|d]])

  | abs_mag=12.8

  | inclination=4.2564°

  | albedo=''unknown''

  | asc_node=82.661°

  | temperature=

  | arg_peri=55.396°

  | mean_anomaly=317.487[[Degree (angle)|°]]

  | avg_speed=19.80 km/s

  | dimensions=

  | mass=

  | density=

  | rotation={{Convert|5.5783|h|d|abbr=on|lk=on}}<ref name="JPL"/><ref name="Pilcher2010">{{Citation

| pages    = 119–122

  |date=July 2010

  | bibcode  = 2010MPBu...37..119P

| postscript= .

}}</ref>

  | spectral_type=[[A-type asteroid|A]] or  [[L-type asteroid|Ld]]

  | abs_magnitude=13.0

  | albedo=

  | single_temperature=

| uncertainty=0

}}

}}

'''728 Leonisis''' is an [[asteroid]] of the [[Flora family]], found by [[Johann Palisa]] in [[1912]] in [[Vienna]].  Its provisional name was '''1912 NU'''.

'''728 Leonisis''' is an [[asteroid]] of the [[Flora family]], found by [[Johann Palisa]] in [[1912]] in [[Vienna]].  Its provisional name was '''1912 NU'''.

Astronomers are not sure what its spectral class is. It has been previously placed in the rare [[A-type asteroid|A]] and [[L-type asteroid|L]] classes.<ref>[http://www.psi.edu/pds/resource/taxonomy.html]</ref> These are generally "stony" spectra, but with significant differences from the usual [[S-type asteroid|S-type]]. The unusual spectrum brings Leonisis' membership in the Flora family into doubt.

Astronomers are not sure what its spectral class is. It has been previously placed in the rare [[A-type asteroid|A]] and [[L-type asteroid|L]] classes.<ref>{{cite web | url=http://www.psi.edu/pds/resource/taxonomy.html | title=Asteroid Taxonomy &#124; PDS SBN Asteroid/Dust Subnode }}</ref> These are generally "stony" spectra, but with significant differences from the usual [[S-type asteroid|S-type]]. The unusual spectrum brings Leonisis' membership in the Flora family into doubt.

 

== References ==

== References ==

{{reflist}}

{{reflist}}

== Other websites ==

== Other websites ==

* [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.txt Discovery Circumstances: Numbered Minor Planets]

* [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.txt Discovery Circumstances: Numbered Minor Planets]