390 Alma

{{Short description|Main-belt asteroid}}

{{Use dmy dates|date=June 2017}}

{{Infobox planet

| minorplanet=yes

| background=#D6D6D6

| image=390Alma (Lightcurve Inversion).png

| image_scale =

| caption=A three-dimensional model of 390 Alma based on its light curve

| name=390 Alma

| discoverer=Guillaume Bigourdan

| discovered=24 March 1894

| mpc_name=(390) Alma

| alt_names=1894 BC; 1930 QW;
1950 BV; 1950 CH;
1953 YB; 1963 DF

| named_after=Alma River

| mp_category=Main belt (Eunomia family)

| epoch=31 July 2016 (JD 2457600.5)

| semimajor={{Convert|2.65059|AU|Gm|abbr=on}}

| perihelion={{Convert|2.29906|AU|Gm|abbr=on}}

| aphelion={{Convert|3.00211|AU|Gm|abbr=on|lk=on}}

| eccentricity=0.13262

| period=4.32 yr (1576.2 d)

| inclination=12.1645°

| asc_node=305.223°

| arg_peri=190.194°

| mean_anomaly=136.953°

| dimensions={{val|23.74|1.4|ul=km}}
24 km

| mass=

| density=~2.7 g/cm³

| rotation={{Convert|3.74|h|d|abbr=on|lk=on}}
0.156 d

| spectral_type=S-type asteroid

| abs_magnitude=10.39

| albedo={{val|0.2190|0.029}}

| mean_motion={{Deg2DMS|0.228397|sup=ms}} / day

| orbit_ref={{Cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=390;cad=1 |title=390 Alma (1894 BC) |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=10 May 2016}}

| observation_arc=122.02 yr (44568 d)

| uncertainty=0

}}

390 Alma is an asteroid from the intermediate asteroid belt, approximately 24 kilometers in diameter. It was Guillaume Bigourdan's only asteroid discovery. He discovered it on 24 March 1894 in Paris.