657 Gunlöd

{{Short description|Main-belt asteroid}}

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

{{Infobox planet

| minorplanet= yes

| background= #D6D6D6

| name= 657 Gunlöd

| mpc_name= (657) Gunlöd

| alt_names= 1908 BV; 1927 SC;
1929 AM; 1936 YJ

| discoverer= A. Kopff

| discovered= 23 January 1908

| discovery_site= Heidelberg Obs.

| epoch= 31 July 2016 (JD 2457600.5)

| eccentricity= 0.11223

| semimajor= {{Convert|2.6118|AU|Gm|abbr=on}}

| perihelion= {{Convert|2.3187|AU|Gm|abbr=on}}

| aphelion= {{Convert|2.9049|AU|Gm|abbr=on|lk=on}}

| period= 4.22 yr (1541.7 d)

| inclination= 10.228°

| asc_node= 297.595°

| arg_peri= 245.225°

| mean_anomaly= 207.017°

| mean_motion= {{Deg2DMS|0.23351|sup=ms}} / day

| orbit_ref= {{Cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=657;cad=1 |title=657 Gunlod (1908 BV) |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=2016-05-05 |df=dmy-all}}

| observation_arc= 107.90 yr (39412 d)

| uncertainty= 0

| abs_magnitude= 10.93

| rotation= {{Convert|15.6652|h|d|abbr=on|lk=on}}

| albedo= {{val|0.0415|0.003}}

| mean_radius= {{val|21.26|0.7}} km

}}

657 Gunlöd is a dark background asteroid orbiting in the intermediate asteroid belt, approximately {{convert|43|km|mi}} in diameter. It was discovered on 23 January 1908, by astronomer August Kopff at the Heidelberg Observatory in southwest Germany. It has an albedo of around 0.042 and a rotation period of 15.7 hours.