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{{short description|salah satu asteroid dekat Bumi yang paling berbahaya}}
{{Infobox Planet
{{Infobox planet
|minorplanet = yes
| minorplanet = yes
|width = 25em
| background = #FFC2E0
|bgcolour =
| name = 101955 Bennu
|apsis =
| pronounced = {{IPAc-en|'|b|ɛ|n|u:}}<ref>{{dict.com|Bennu}}</ref>
|name = 101955 Bennu
| named_after = [[Bennu]]
|symbol =
|image =
| image = BennuAsteroid.jpg
| image_size = 250px
|caption =
| image_alt =
|discovery = yes
| caption = Gambar mosaik asteroid Bennu yang tersusun atas 12 gambar PolyCam hasil pengamatan wahana antariksa [[OSIRIS-REx]] pada 2 Desember 2018. OSIRIS-REx saat itu berjarak {{convert|24|km|mi|abbr=on}} dari asteroid Bennu.
|discovery_ref =
| discovery_ref = <ref name="jpldata" />
|discoverer =LINEAR
| discoverer = [[Lincoln Near-Earth Asteroid Research|LINEAR]]
|discovery_site =704
|discovered = 1999/09/11
| discovered = 11 September 1999
| discovery_site = [[MIT Lincoln Laboratory#Lincoln Laboratory's ETS|Lincoln Lab's ETS]]
|designations = yes
| mpc_name = (101955) Bennu
|mp_name =
| mp_category = [[Asteroid Apollo|Apollo]]{{·}}[[Objek dekat Bumi|NEO]]{{·}}[[Objek berpotensi berbahaya|PHA]]
|alt_names =
| alt_names = {{mp|1999 RQ|36}}
|mp_category =
|orbit_ref =
| orbit_ref = <ref name="jpldata" />
| epoch = 31 Juli 2016 ([[hari Julian|JD]] 2457600.5)
|epoch =
| uncertainty = 0
|aphelion =1.355
| observation_arc = 13.36 tahun (4880 hari)
|perihelion =0.897
| aphelion = {{convert|1.3559|au|Gm|abbr=on|lk=on}}
|semimajor =1.126
| perihelion = {{convert|0.89689|au|Gm|abbr=on}}
|eccentricity =0.204
| semimajor = {{convert|1.1264|au|Gm|abbr=on}}
|period =
| eccentricity = 0.20375
|avg_speed =
| period = 1.1955 [[tahun Julian (astronomi)|tahun]] (436.65 [[tahun Julian (astronomi)|hari]])
|inclination =6.0
| avg_speed = {{convert|28.0|km/s|mph|abbr=on}}
|asc_node =2.0
| inclination = 6.0349°
|mean_anomaly =237.8
| asc_node = 2.0609°
|arg_peri =66.3
| mean_anomaly = 101.7039[[Derajat (sudut)|°]]
|satellites =
| mean_motion = {{Deg2DMS|0.82446|sup=ms}} / day
|physical_characteristics = yes
| arg_peri = 66.2231°
|dimensions =
| moid = {{convert|0.0032228|au|km|abbr=on}}
|mass =
| venus_moid = {{convert|0.194|au|km|abbr=on}}<ref name="mpc"/>
|density =
| mars_moid = {{convert|0.168|au|km|abbr=on}}<ref name="mpc"/>
|surface_grav =
| jupiter_moid = {{convert|3.877|au|Gm|abbr=on}}
|escape_velocity =
| tisserand = 5.525
|sidereal_day =
| p_orbit_ref = <ref name=neodys />
|axial_tilt =
| p_semimajor =
|pole_ecliptic_lat =
| p_eccentricity = 0.21145
|pole_ecliptic_lon =
| p_inclination = 5.0415°
|albedo =
| p_mean_motion = 301.1345
|temperatures=
| physical_ref = <ref name="Lauretta2019Nature">{{cite journal |last1= Lauretta |first1= D. S. |date= March 19, 2019 |title= The unexpected surface of asteroid (101955) Bennu|journal=[[Nature (journal)|Nature]] |volume= 568 |issue= 7750 |pages=55–60 |doi= 10.1038/s41586-019-1033-6|pmid= 30890786 |pmc= 6557581 |bibcode= 2019Natur.568...55L }}</ref>
|temp_name1 =
| dimensions = {{val|565|x|535|x|508|ul=m}}<ref name="jpldata" />
|mean_temp_1 =
| mean_radius = {{val|245.03|0.08|u=m}}
|max_temp_1 =
| equatorial_radius = {{val|282.37|0.06|u=m}}
|temp_name2 =
| polar_radius = {{val|249.25|0.06|u=m}}
|max_temp_2 =
| volume = {{val|0.0615|0.0001|u=km3}}
|spectral_type =
| surface_area = {{val|0.782|0.004|u=km2}}
|abs_magnitude =20.9
| mass = {{val|7.329|0.009|e=10|u=kg}}
| surface_grav = 6.27 mikro-[[Gravitasi Bumi|g]]<ref name="Barnouin2019Nature">{{cite journal |last1= Barnouin |first1= O. S. |date= March 19, 2019 |title= Shape of (101955) Bennu indicative of a rubble pile with internal stiffness|journal=[[Nature Geoscience]] |volume= 12 |issue= 4 |pages= 247–252 |doi= 10.1038/s41561-019-0330-x|pmid= 31080497 |pmc= 6505705 |bibcode= 2019NatGe..12..247B }}</ref>
| density = {{val|1.190|.013|u=g/cm3}}
| axial_tilt = {{val|177.6|0.11}}°
| right_asc_north_pole = {{val|+85.65|0.12}}°
| declination = {{val|−60.17|0.09}}°
| rotation = {{val|4.296057|0.000002|ul=h}}
| albedo = {{val|0.044|0.002}}
| spectral_type = [[B-type asteroid|B]]<ref name="jpldata" /><ref name="Lauretta2019Nature" /><br />[[F-type asteroid|F]]<ref name="Cellino2018" />
| abs_magnitude = 20.9
| temp_name1 = Kelvin<ref name="PHL" />
| min_temp_1 = 236
| mean_temp_1 = 259
| max_temp_1 = 279
| temp_name2 = Fahrenheit
| min_temp_2 = -34.6
| mean_temp_2 = 6.8
| max_temp_2 = 42.8
| temp_name3 = Celsius
| min_temp_3 = -37
| mean_temp_3 = -14
| max_temp_3 = 6
}}
}}
'''101955 Bennu''' (1999 RQ36) adalah sebuah [[asteroid]]. Asteroid ini merupakan bagian dari [[asteroid Apollo]], yang terletak dekat dengan [[bumi]]. [[Eksentrisitas orbit]] asteroid ini tercatat sebesar 0.204, sementara [[magnitudo mutlak]]nya adalah 20.9.
'''101955 Bennu''' (1999 RQ36) adalah sebuah [[asteroid]]. Asteroid ini merupakan bagian dari [[asteroid Apollo]], yang terletak dekat dengan [[bumi]]. [[Eksentrisitas orbit]] asteroid ini tercatat sebesar 0.204, sementara [[magnitudo mutlak]]nya adalah 20.9.
Baris 60: Baris 82:


== Referensi ==
== Referensi ==
{{Reflist|refs=
<ref name="jpldata">
| type = 2017-09-01 last observation. Solution includes non-gravitational parameters
| title = JPL Small-Body Database Browser: 101955 Bennu (1999 RQ36)
| publisher = [[Jet Propulsion Laboratory]]
| url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=101955;cad=1
| archiveurl = https://web.archive.org/web/20180319121233/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=101955;cad=1
| archivedate= 19 March 2018
| url-status = live
| access-date = 20 August 2016}}</ref>


<ref name=neodys>{{cite web | url=https://newton.spacedys.com/neodys/index.php?pc=1.1.0&n=101955 | title=(101955) Bennu | publisher=University of Pisa | website=NEODyS | access-date=1 December 2015}}</ref>
{{Reflist}}


<ref name="mpc">{{cite web
== Pranala luar ==
| title=(101955) Bennu = 1999 RQ36 Orbit
| publisher=[[Minor Planet Center]]
| url=https://www.minorplanetcenter.net/db_search/show_object?object_id=Bennu
| access-date=2018-03-21
}}</ref>


<ref name="PHL">{{cite web | url=http://phl.upr.edu/projects/habitable-exoplanets-catalog/calculators | title=Planetary Habitability Calculators | publisher=University of Puerto Rico at Arecibo | website=Planetary Habitability Laboratory | access-date=6 December 2015}}</ref>

<ref name="Cellino2018">{{Cite journal
| title=Unusual polarimetric properties of (101955) Bennu: similarities with F-class asteroids and cometary bodies
| journal=Monthly Notices of the Royal Astronomical Society: Letters
| volume=481
| issue=1
| pages=L49–L53
| arxiv=1808.07812
| last1=Hergenrother
| first1=Carl W
| author2=Maria Antonietta Barucci
| last3=Barnouin
| first3=Olivier
| last4=Bierhaus
| first4=Beau
| last5=Binzel
| first5=Richard P
| last6=Bottke
| first6=William F
| last7=Chesley
| first7=Steve
| last8=Clark
| first8=Ben C
| last9=Clark
| first9=Beth E
| last10=Cloutis
| first10=Ed
| author11=Christian Drouet d'Aubigny
| last12=Delbo
| first12=Marco
| last13=Emery
| first13=Josh
| last14=Gaskell
| first14=Bob
| last15=Howell
| first15=Ellen
| last16=Keller
| first16=Lindsay
| last17=Kelley
| first17=Michael
| last18=Marshall
| first18=John
| last19=Michel
| first19=Patrick
| last20=Nolan
| first20=Michael
| last21=Rizk
| first21=Bashar
| last22=Scheeres
| first22=Dan
| last23=Takir
| first23=Driss
| last24=Vokrouhlický
| first24=David D
| last25=Beshore
| first25=Ed
| last26=Lauretta
| first26=Dante S
| s2cid=119226483
| year=2018
| doi=10.1093/mnrasl/sly156
| bibcode=2018MNRAS.481L..49C
}}</ref>


}}

== Pranala luar ==
* [http://www.minorplanetcenter.net/iau/lists/t_apollos.html Daftar asteroid Apollo] - ''The International Astronomical Union Minor Planet Center.''
* [http://www.minorplanetcenter.net/iau/lists/t_apollos.html Daftar asteroid Apollo] - ''The International Astronomical Union Minor Planet Center.''
{{asteroid-stub}}
{{asteroid-stub}}

Revisi per 2 Desember 2020 13.16

101955 Bennu
Gambar mosaik asteroid Bennu yang tersusun atas 12 gambar PolyCam hasil pengamatan wahana antariksa OSIRIS-REx pada 2 Desember 2018. OSIRIS-REx saat itu berjarak 24 km (15 mi) dari asteroid Bennu.
Penemuan[1]
Ditemukan olehLINEAR
Situs penemuanLincoln Lab's ETS
Tanggal penemuan11 September 1999
Penamaan
(101955) Bennu
Pelafalan/ˈbɛnuː/[2]
Asal nama
Bennu
1999 RQ36
Apollo · NEO · PHA
Ciri-ciri orbit[1]
Epos 31 Juli 2016 (JD 2457600.5)
Parameter ketidakpastian 0
Rentang pengamatan13.36 tahun (4880 hari)
Aphelion13.559 au (2.028.400 Gm)
Perihelion089.689 au (13.417.300 Gm)
11.264 au (1.685.100 Gm)
Eksentrisitas0.20375
1.1955 tahun (436.65 hari)
Kecepatan orbit rata-rata
280 km/s (630.000 mph)
101.7039°
0° 49m 28.056s / day
Inklinasi6.0349°
2.0609°
66.2231°
MOID Bumi00.032.228 au (4,8212×1012 km)
MOID Venus0.194 au (2,90×1010 km)[3]
MOIDnbsp;Mars&0.168 au (2,51×1010 km)[3]
MOID Jupiter3.877 au (580.000 Gm)
TJupiter5.525
Elemen orbit tetap[4]
0.21145
Inklinasi tetap
5.0415°
301.1345 ° / tahun
1.19548 tahun
(436.649 hari)
Ciri-ciri fisik[7]
Dimensi565 m × 535 m × 508 m[1]
Jari-jari rata-rata
245,03±0,08 m
Jari-jari khatulistiwa
282,37±0,06 m
Jari-jari kutub
249,25±0,06 m
0,782±0,004 km2
Volume0,0615±0,0001 km3
Massa(7,329±0,009)×1010 kg
Massa jenis rata-rata
1,190±0,013 g/cm3
6.27 mikro-g[5]
4,296057±0,000002 j
177,6±0,11°
Asensio rekta kutub utara
+85,65±0,12°
Deklinasi kutub utara
−60,17±0,09°
0,044±0,002
Suhu permukaan min. rata-rata maks.
Kelvin[6] 236 259 279
Fahrenheit -34.6 6.8 42.8
Celsius -37 -14 6
B[1][7]
F[8]
20.9

101955 Bennu (1999 RQ36) adalah sebuah asteroid. Asteroid ini merupakan bagian dari asteroid Apollo, yang terletak dekat dengan bumi. Eksentrisitas orbit asteroid ini tercatat sebesar 0.204, sementara magnitudo mutlaknya adalah 20.9.

Pembentukan

Seperti asteroid pada umumnya, asteroid ini terbentuk dari nebula matahari primordial sebagai pecahan planetisimal, sesuatu di nebula matahari muda yang tidak cukup besar untuk berubah menjadi planet.[9]

Penemuan

Bagi Puzio, pesawat ruang angkasa OSIRIS-REx dengan lengan TAGSAM yang diperpanjang menyerupai dewa Mesir, biasanya digambarkan sebagai burung bangau.

Referensi

  1. ^ a b c d | type = 2017-09-01 last observation. Solution includes non-gravitational parameters | title = JPL Small-Body Database Browser: 101955 Bennu (1999 RQ36) | publisher = Jet Propulsion Laboratory | url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=101955;cad=1 | archiveurl = https://web.archive.org/web/20180319121233/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=101955;cad=1 | archivedate= 19 March 2018 | url-status = live | access-date = 20 August 2016}}
  2. ^ Templat:Dict.com
  3. ^ a b "(101955) Bennu = 1999 RQ36 Orbit". Minor Planet Center. Diakses tanggal 2018-03-21. 
  4. ^ "(101955) Bennu". NEODyS. University of Pisa. Diakses tanggal 1 December 2015. 
  5. ^ Barnouin, O. S. (March 19, 2019). "Shape of (101955) Bennu indicative of a rubble pile with internal stiffness". Nature Geoscience. 12 (4): 247–252. Bibcode:2019NatGe..12..247B. doi:10.1038/s41561-019-0330-x. PMC 6505705 alt=Dapat diakses gratis. PMID 31080497. 
  6. ^ "Planetary Habitability Calculators". Planetary Habitability Laboratory. University of Puerto Rico at Arecibo. Diakses tanggal 6 December 2015. 
  7. ^ a b Lauretta, D. S. (March 19, 2019). "The unexpected surface of asteroid (101955) Bennu". Nature. 568 (7750): 55–60. Bibcode:2019Natur.568...55L. doi:10.1038/s41586-019-1033-6. PMC 6557581 alt=Dapat diakses gratis. PMID 30890786. 
  8. ^ Hergenrother, Carl W; Maria Antonietta Barucci; Barnouin, Olivier; Bierhaus, Beau; Binzel, Richard P; Bottke, William F; Chesley, Steve; Clark, Ben C; Clark, Beth E; Cloutis, Ed; Christian Drouet d'Aubigny; Delbo, Marco; Emery, Josh; Gaskell, Bob; Howell, Ellen; Keller, Lindsay; Kelley, Michael; Marshall, John; Michel, Patrick; Nolan, Michael; Rizk, Bashar; Scheeres, Dan; Takir, Driss; Vokrouhlický, David D; Beshore, Ed; Lauretta, Dante S (2018). "Unusual polarimetric properties of (101955) Bennu: similarities with F-class asteroids and cometary bodies". Monthly Notices of the Royal Astronomical Society: Letters. 481 (1): L49–L53. arXiv:1808.07812 alt=Dapat diakses gratis. Bibcode:2018MNRAS.481L..49C. doi:10.1093/mnrasl/sly156. 
  9. ^ "What Are Asteroids And Comets?". Near Earth Object Program FAQ. NASA. Diarsipkan dari versi asli tanggal 9 September 2010. Diakses tanggal 13 September 2010. 

Pranala luar

Ikon rintisan

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