762 Pulcova

{{Infobox planet

| minorplanet = yes

| background = #D6D6D6

| name = 762 Pulcova

| image = 762Pulcova-SwRI.gif

| image_scale =

| caption = 762 Pulcova and satellite as seen with adaptive optics in 2000

| discovery_ref =

| discoverer = G. N. Neujmin

| discovered = 3 September 1913

| mpc_name = (762) Pulcova

| pronounced = {{IPAc-en|'|p|ʊ|l|k|ə|v|ə}}

| adjective = Pulcovian {{IPAc-en|p|ʊ|l|'|k|oʊ|v|i|ə|n}}Catalogue of the Mathematical, Historical, Bibliographical and Miscellaneous Portion of the Celebrated Library of M. Guglielmo Libri, 1861, p. 216

| named_after = Pulkovo Heights

| alt_names = 1913 SQ

| mp_category = Main belt

| orbit_ref =

| epoch = 31 July 2016 (JD 2457600.5)

| aphelion = {{Convert|3.4801|AU|Gm|abbr=on|lk=on}} (Q)

| perihelion = {{Convert|2.8291|AU|Gm|abbr=on}} (q)

| semimajor = {{Convert|3.1546|AU|Gm|abbr=on}} (a)

| eccentricity = 0.10319 (e)

| period = 5.60 yr (2046.5 d)

| avg_speed =

| inclination = 13.089° (i)

| asc_node = 305.76° (Ω)

| mean_anomaly = 348.62° (M)

| arg_peri = 189.54° (ω)

| satellites = S/2000 (762) 1

| dimensions =

| mean_radius = {{val|68.54|1.6}} km

| mass = 1.40{{e|18}} kg

| density = 0.90 g/cm³

| surface_grav =

| escape_velocity =

| sidereal_day = 5.839 hr

| axial_tilt =

| pole_ecliptic_lat =

| pole_ecliptic_lon =

| albedo = {{val|0.0458|0.002}}

| spectral_type =

| magnitude = 11.93 to 14.79Magnitudes generated with JPL Horizons for the year 1950 through 2100

| abs_magnitude = 8.28

| mean_motion = {{Deg2DMS|0.17591|sup=ms}} / day (n)

| observation_arc = 100.08 yr (36553 d)

| uncertainty = 0

| rotation = {{Convert|5.839|h|d|abbr=on|lk=on}}

| moid = {{Convert|1.84297|AU|Gm|abbr=on}}

| jupiter_moid = {{Convert|1.60162|AU|Gm|abbr=on}}

| tisserand = 3.158

}}

762 Pulcova is a main-belt asteroid. It was discovered by Grigoriy N. Neujmin in 1913, and is named after Pulkovo Observatory, near Saint Petersburg. Pulcova is 137 km in diameter,{{cite web

|type=2009-09-22 last obs

|title=JPL Small-Body Database Browser: 762 Pulcova (1913 SQ)

|url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=762

|access-date=5 May 2016}} and is a C-type asteroid, which means that it is dark in colouring with a carbonate composition.

Photometric observations of this asteroid from Leura, Australia during 2006 gave a light curve with a period of 5.8403 ± 0.0005 hours and a brightness variation of 0.20 ± 0.02 in magnitude. This result is in agreement with previous studies.

Satellite

File:762 Pulcova Hubble.jpg in January 2005]]

File:762 Pulkova orbit.png

On February 22, 2000,{{cite web

|date=2000-02-22

|title=762 Pulcova

|publisher=SwRI

|url=http://www.boulder.swri.edu/merline/press/fig3.html

|access-date=2009-10-20}} (AO image) astronomers at the Canada-France-Hawaii Telescope on Mauna Kea, Hawaii, discovered a 15-km moon (roughly a tenth the size of the primary){{cite web

|date=2000-10-26

|title=Astronomers Image Double Asteroid

|publisher=SwRI Press Release

|author=Dr. William J. Merline

|author2=Maria Martinez

|name-list-style=amp

|url=http://www.boulder.swri.edu/merline/press/release.txt

|access-date=2009-10-20}} (mentions both 90 Antiope and 762 Pulcova) orbiting Pulcova at a distance of 800 km. Its orbital period is 4 days.{{cite web | url=http://www.johnstonsarchive.net/astro/astmoons/am-00762.html | title=(762) Pulcova | work=Johnston's Archive | date=September 1, 2005 | access-date=1 November 2013 | author=Johnston, Robert}} The satellite is about 4 magnitudes fainter than the primary. It was one of the first asteroid moons to be identified.

Density

In the year 2000, Merline estimated Pulcova to have a density of 1.8 g/cm³, which would make it more dense than the triple asteroid 45 Eugenia, and binary 90 Antiope.{{cite web

|date=2000-06-21

|title=Discovery of Companions to Asteroids 762 Pulcova and 90 Antiope by Direct Imaging

|publisher=SwRI

|display-authors=6

|author=W.J. Merline (SwRI)

|author2=L.M. Close (ESO, U. Arizona)

|author3=C. Dumas (JPL)

|author4=J.C. Shelton (Mt. Wilson Obs.)

|author5=F. Menard (CFHT)

|author6=C.R. Chapman

|author7=D.C. Slater (SwRI)

|url=http://www.boulder.swri.edu/merline/press/dps.abstract.pdf

|access-date=2009-10-21}} But estimates by Marchis in 2008 suggest a density of only 0.90 g/cm³,

{{cite web

|date=2008

|title=Recent Asteroid Mass Determinations

|publisher=Personal Website

|author=Jim Baer

|url=http://home.earthlink.net/~jimbaer1/astmass.txt

|access-date=2008-11-28

|archive-url=https://web.archive.org/web/20130702212735/http://home.earthlink.net/~jimbaer1/astmass.txt

|archive-date=2013-07-02

|url-status=dead

}}

suggesting it may be a loosely packed rubble pile, not a monolithic object.

References

{{Reflist|refs=

{{Citation

| last1 = Oey

| first1 = Julian

| title = Lightcurves analysis of 10 asteroids from Leura Observatory

| journal = The Minor Planet Bulletin

| volume = 33

| issue = 4

| pages = 96–99

|date=December 2006

| bibcode = 2006MPBu...33...96O

| postscript= .

}}

External links

[http://www.johnstonsarchive.net/astro/asteroidmoons.html Asteroids with Satellites], Robert Johnston, johnstonsarchive.net
{{AstDys|762}}
{{JPL small body}}

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