291 Alice

{{Short description|Main-belt asteroid}}

{{Use dmy dates|date=October 2019}}

{{Infobox planet

| minorplanet=yes

| background=#D6D6D6

| name=291 Alice

| image=291Alice (Lightcurve Inversion).png

| image_scale =

| caption=A three-dimensional model of 291 Alice based on its light curve

| discoverer=Johann Palisa

| discovered=25 April 1890

| mpc_name=(291) Alice

| alt_names=A890 HA, {{mp|1954 UJ|3}}

| mp_category=main-belt

| orbit_ref=

| epoch=31 July 2016 (JD 2457600.5)

| semimajor={{Convert|2.22182|AU|Gm|abbr=on}}

| perihelion={{Convert|2.01631|AU|Gm|abbr=on}}

| aphelion={{Convert|2.4273|AU|Gm|abbr=on|lk=on}}

| eccentricity=0.092495

| period=3.31 yr (1209.7 d)

| inclination=1.8555°

| asc_node=161.655°

| arg_peri=331.580°

| mean_anomaly=115.293°

| dimensions={{val|14.97|1.1|ul=km}}
19×12×11 km[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab Supplemental IRAS Minor Planet Survey] {{webarchive |url=https://web.archive.org/web/20060623213811/http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab |date=June 23, 2006 }}{{cite journal | author= A. Kryszczyńska| title= CCD Photometry of Seven Asteroids: New Spin Axis and Shape Determinations| journal= Icarus| year= 1996| volume= 124| issue= 1| pages= 134–140| doi= 10.1006/icar.1996.0194| bibcode=1996Icar..124..134K|display-authors=etal}}

| mass=~

| density=~2.7 g/cm³{{cite journal | author= G. A. Krasinsky| title= Hidden Mass in the Asteroid Belt| journal= Icarus| year= 2002| volume= 158| issue= 1| pages= 98–105| doi= 10.1006/icar.2002.6837| bibcode=2002Icar..158...98K|display-authors=etal}}

| rotation={{Convert|4.313|h|d|abbr=on|lk=on}}
0.180 d (4.32 h)[https://archive.today/20060614093519/http://www.psi.edu/pds/archive/lc.html PDS lightcurve data]

| spectral_type=S{{cite web|url=http://www.psi.edu//pds/resource/taxonomy.html|title=Asteroid Taxonomy|publisher=Planetary Science Institute|access-date=2016-02-27}}

| abs_magnitude=11.45

| albedo={{val|0.2075|0.033}}
0.208

| mean_motion={{Deg2DMS|0.297606|sup=ms}} / day

| observation_arc=124.62 yr (45516 d)

| uncertainty=0

}}

291 Alice is a stony background asteroid from the inner region of the asteroid belt. It was discovered by Johann Palisa on 25 April 1890 at the Vienna Observatory.

Photometric observations of this asteroid at the Leura Observatory in Leura, Australia during 2006 gave a rotation period of 4.313 ± 0.002 hours and a brightness variation of 0.20 ± 0.02 in magnitude. This result is in agreement with previous studies. Lightcurve analysis indicates that Alice's pole points towards either ecliptic coordinates (β, λ) = (55°, 65°) or (β, λ) = (55°, 245°) with a 10° uncertainty. This gives an axial tilt of about 35° in both cases.