ʻOumuamua

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1I/ʻOumuamua
ʻOumuamua, Gamba diambiak jo Teleskop William Herschel . 1I/ʻOumuamua iyolah titiak di tongah gamba. Basobok garak copek objek antarbintang, bintang-bintang di latar balakang tampak ajak garih-garih cahayo.
Panamoan
1I/2017 U1 (ʻOumuamua)[1]
Asa namo
(namo Hawaii)[1]
1I/ʻOumuamua
1I/2017 U1 · A/2017 U1 [2]
C/2017 U1 [3] · P10Ee5V
Objek antarbintang,[1] asteroid hiperbola (JPL)[4]
Ciri-ciri orbit [4]
Epos 2017-Oct-31 (JD 2458057.5)
Rontang pangamatan34 hari
Perihelion0,25534 AU
−1,2799 AU[n 1]
Eksentrisitas1,19949 ± 0.00019
Kacapatan orbit rata-rata
26,33±0,01 km/s (antarbintang)[5]
35,060°
0° 40m 48.72s / day
Inklinasi122,69°
24,599°
241,70°
MOID Bumi0,0958 AU · 37,3 LD
MOID Jupiter1,455 AU
Ciri-ciri fisik
Dimensi180 × 30 × 30 m (± 0.10)[6][7]
200 m (± 0.06–0.08)[8]
8,14±0,02 h[9]
8,10±0,42 h[8]
0,1 (spectral est.)[6]
0,06–0,08 (spectral est.)[8]
RR (merah, tidak berbentuk)[10]
D?[6]
P?[8]
B–V = 0,7±0,06[6]
V-R = 0,45±0,05[6]
g-r = 0,47±0,04[8]
r-i = 0,36±0,16[8]
r-J = 1,20±0,11[8]
19,7 hingga >27m5[5][n 2][11]
22,08±0,45[4]

1I/‘Oumuamua (sacaro rasmi banamo 1I/2017 U1; sabalunnyo C/2017 U1 (PANSTARRS) dan A/2017 U1) adolah objek antarbintang nan partamo dikana nan lalu ka Tata Surya.[12] Objek iko awalnyo dikiro sabuah komet, kudian diklasifikasikan sabagai asteroid saminggu kudian. Objek iko iyolah bando partamo dari objek antarbintang. Akibaik lintasan hiperbola, bando iko akan malalui orbit Neptunus pado taun 2022 dan maninggakan sistem Tata Surya kiro-kiro 20.000 taun. Jumlah wakatu objek tasabuik malayang di antaro bintang-bintang galaksi cakram iko alun dikatahui.

Badasarkan 34 hari observasi arc, eksentrisitas orbit ‘Oumuamua iko iyolah 1,20, nan paliang tinggi dari objek nan alun dicaliak dalam sistem Tata Surya. Pamogang rekor sabalunnyo iyolah C/1980 E1 dangan eksentrisitas orbit 1,057.[n 3] Eksentrisitas tinggi dari orbit ‘Oumuamua, baiak orbit masuak dan kalua, manunjuakan dek bando tu indak parnah tarikek gravitasi ka Tata Surya dan objek antarbintang basobok laju masuak nan labih capek daripado Laju lapeh Matoari. Benda iko bagarak pado arah nan balawanan dari orbit planet-planet, pado kamiringan ka ekliptika hinggo 60°. Arah garakan dari ‘Oumuamua iyolah 6° dari apeks tata surya.

Nomenklatur[suntiang | suntiang sumber]

Catatan[suntiang | suntiang sumber]

  1. ↑ Objects in hyperbolic orbits have negative semimajor axis, giving them a positive orbital energy.
  2. ↑ Range at which the object is expected to be observable. Brightness peaked at 19.7 mag on 18 October 2017, and fades below 27.5 mag (the limit of HST for fast-moving objects) around 1 January 2018. By late 2019, it should dim to 34 mag.
  3. ↑ Unlike ʻOumuamua, C/1980 E1's orbit got its high eccentricity due to a close encounter with Jupiter. Its inbound-orbit eccentricity was less than 1.

Rujuakan[suntiang | suntiang sumber]

  1. ↑ a b c "MPEC 2017-V17 : NEW DESIGNATION SCHEME FOR INTERSTELLAR OBJECTS". Minor Planet Center. International Astronomical Union. 6 November 2017. Diakses tanggal 6 November 2017. 
  2. ↑ "MPEC 2017-U183: A/2017 U1". Minor Planet Center. International Astronomical Union. 25 October 2017. Diakses tanggal 25 October 2017.  (AK17U010)
  3. ↑ "MPEC 2017-U181: COMET C/2017 U1 (PANSTARRS)". Minor Planet Center. International Astronomical Union. 25 October 2017. Diakses tanggal 25 October 2017.  (CK17U010)
  4. ↑ a b c "JPL Small-Body Database Browser: ʻOumuamua (A/2017 U1)" (JPL s14 with last obs: 17 November 2017). Jet Propulsion Laboratory. Diarsipkan dari versi asli tanggal 25 October 2017. Diakses tanggal 23 November 2017. 
  5. ↑ a b "Pseudo-MPEC for A/2017 U1 (Fact File)". Bill Gray of Project Pluto. 26 October 2017. Diakses tanggal 26 October 2017.  (Orbital elements)
  6. ↑ a b c d e Jewitt, David; Luu, Jane; Rajagopal, Jayadev; Kotulla, Ralf; Ridgway, Susan; Liu, Wilson; Augusteijn, Thomas (2017). "Interstellar Interloper 1I/2017 U1: Observations from the NOT and WIYN Telescopes" (PDF). Submitted to Astrophysical Journal Letters: 11. arXiv:1711.05687 alt=Dapat diakses gratis. 
  7. ↑ "A Familiar-Looking Messenger from Another Solar System". National Optical Astronomy Observatory. Diarsipkan dari versi asli tanggal 2017-11-16. Diakses tanggal 15 November 2017. 
  8. ↑ a b c d e f g Bannister, Michele T.; Schwamb, Megan E. (2017). "Col-OSSOS: Colors of the Interstellar Planetesimal 1I/2017 U1 in Context with the Solar System". Submitted to ApJL: 9. arXiv:1711.06214 alt=Dapat diakses gratis. 
  9. ↑ Bolin, Bryce T.; Weaver, Harold A.; Fernandez, Yanga R.; Lisse, Carey M.; Huppenkothen, Daniela; Jones, R. Lynne; Juric, Mario; Moeyens, Joachim; Schambeau, Charles A.; Slater, Colin T.; Ivezic, Zeljko; Connolly, Andrew J. (2017). "APO Time Resolved Color Photometry of Highly-Elongated Interstellar Object 1I/ʻOumuamua". Submitted to Astrophysical Journal Letters: 11. arXiv:1711.04927 alt=Dapat diakses gratis. 
  10. ↑ Fitzsimmons, Alan [@FitzsimmonsAlan] (27 Oct 2017). "Spectrum of A/2017 U1 obtained on Wednesday night with the @INGLaPalma 4.2m WHT. Colour is red like Kuiper Belt Objects, featureless" (Tweet) – via Twitter. 
  11. ↑ "Which way home? Finding the origin of our Solar System's first interstellar visitor" (PDF). NASA. Diakses tanggal 15 November 2017. 
  12. ↑ Overbye, Dennis (22 November 2017). "An Interstellar Visitor Both Familiar and Alien". The New York Times. Diakses tanggal 23 November 2017. 
Kutipan rusak: Tag <ref> jo namo "NASA171026" pado <references> indak ado.

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