2005 NB56

{{Use dmy dates|date=February 2018}}

{{DISPLAYTITLE:{{mp|2005 NB|56}}}}

{{Infobox planet

|minorplanet = yes

|background = #FFC2E0

|name = {{mp|2005 NB|56}}

|symbol =

|image =

|caption =

|discovery_ref = {{cite web|title=2005 NB56|url=http://www.minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=2005+NB56|publisher=Minor Planet Center|accessdate=9 August 2017}}

|discoverer = Mount Lemmon Survey

|discovered = 11 July 2005

|discovery_site = Summerhaven, Arizona, US

|mpc_name = 2005 NB56

|mp_category = {{Ubl

| {{mpcat|Apollo}}

| NEO

}}

|alt_names =

|orbit_ref = {{cite sbdb|title=(2005 NB56)|id=3283898|accessdate=9 August 2017}}

|epoch = 14 July 2005 (JD 2453565.5)

|uncertainty = 7

|observation_arc = 17 d

|aphelion = {{Convert|2.41707|AU|Gm|abbr=on|lk=on}}

|perihelion = {{Convert|0.86585|AU|Gm|abbr=on}}

|semimajor = {{Convert|1.64146|AU|Gm|abbr=on}}

|eccentricity = 0.47251

|period = 2.10 yr (768.15 d)

|avg_speed =

|inclination = 6.7563°

|asc_node = 112.359°

|mean_anomaly = 25.175°

|arg_peri = 114.15°

|moid = {{Convert|0.0163799|AU|km|abbr=on}}

|mercury_moid =

|mean_diameter = {{val|170|u=m|p=~}}{{cite arXiv|title=A search for a present-day candidate for the Comet P/Tunguska-1908|first1=E. M.|last1=Drobyshevski|first2=T. Yu|last2=Galushina|first3=M. E.|last3=Drobyshevski|eprint=0903.3313|date=March 2009|class=astro-ph.EP}}

|sidereal_day =

|albedo =

|spectral_type =

|abs_magnitude = 22.9

|mean_motion = {{Deg2DMS|0.46866|sup=ms}} /day

|jupiter_moid = {{Convert|2.5887|AU|Gm|abbr=on}}

}}

{{mp|2005 NB|56}}, also written as 2005 NB56, is a near-Earth asteroid of the Apollo group. In 2009, research physicist Edward Drobyshevski and colleagues have suggested that {{mp|2005 NB|56}} could be a possible source of the meteoroid that caused the Tunguska event on 30 June 1908. It has been also suspected to be a dormant comet.[http://www.popularmechanics.com/science/environment/natural-disasters/4316464 When Comets Attack: Solving the Mystery of the Biggest Natural Explosion in Modern History], By Mark Anderson, Popular Mechanics