Mê-ông-chheⁿ

Mê-ông-chheⁿ
Hoat-kiàn
Hoat-kiàn-chiá	Clyde W. Tombaugh
Hoat-kiàn tē-tiám	Lowell Observatory
Hoat-kiàn ji̍t-chí	February 18, 1930
Miâ-hō
MPC miâ-hō	(134340) Pluto
Hō-miâ iû-lâi	Pluto
Minor planet category	Dwarf planet; Trans-Neptunian object; Kuiper belt object; Plutino;
Kúi-tō sèng-chit
	Goân-kî J2000
Earliest precovery date	August 20, 1909
Aphelion	49.305 AU; (7.37593 billion km); February 2114;
Kīn-ji̍t-tiám	29.658 AU; (4.43682 billion km); (September 5, 1989);
Pòaⁿ-tn̂g chhia-sim	39.482 AU; (5.90638 billion km);
Lî-sim-lu̍t	0.2488
Kúi-tō chiu-kî	247.94 years; 90,560 d;
Hōe-ha̍p chiu-kî	366.73 days
Pêng-kin kúi-tō sok-le̍k	4.743 km/s
Pêng-kin kīn-tiám-kak	14.53 deg
Khi-pêng	17.16°; (11.88° to Sun's equator);
Seng-kau-tiám ê keng-tō͘	110.299°
Hn̄g-tiám ê ín-sò͘	113.834°
Known satellites	5
Bu̍t-lí sèn-chit
Dimensions	2,376.6±1.6 km (observations consistent with a sphere, predicted deviations too small to be observed)
Pêng-kin poàn-kéng	1,188.3±0.8 km; 0.1868 Earths;
Píⁿ-pêⁿ-lu̍t	<1%
Piáu-bīn-chek	1.779×107 km2; 0.035 Earths;
Thé-chek	(7.057±0.004)×109 km3; 0.00651 Earths;
Chit-liōng	(1.303±0.003)×1022 kg; 0.00218 Earths; 0.177 Moons;
Pêng-kin bi̍t-tō͘	1.854±0.006 g/cm3
Piáu-bīn tiōng-le̍k	0.620 m/s2; 0.063 g;
Thoat-cháu so̍k-tō͘	1.212 km/s
Hêng-chheⁿ chū-choán chiu-kî	6.387230 d; 6 d, 9 h, 17 m, 36 s;
Chhiah-tō chū-choán sok-tō͘	47.18 km/h
Chhia-sim khi-pêng	122.53° (to orbit)
Pak-ke̍k chhiah-keng	132.993°
Pak-ke̍k chhiah-hūi	−6.163°
Hoán-siā-lu̍t	0.49 to 0.66 (geometric, varies by 35%)
Bêng-hián-tō͘	13.65 to 16.3 ; (mean is 15.1)
Absolute magnitude (H)	−0.7
Kak-ti̍t-kèng	0.06″ to 0.11″
Tāi-khì-khoan
Piáu-bīn ap-le̍k	1.0 Pa (2015)
Thé-chek cho͘-sêng	Chek-sò͘, methane, it-sng-hoà thoàⁿ-sò͘

Mê-ông-chheⁿ (冥王星; Eng-gí: Pluto; hû-hō: ,^[1]^[2]) sī thài-iông-hē khah goā-khaú-pêng ê 1 lia̍p chheⁿ-thé (celestial body). 1930 nî hông hoat-hiān, tòng-chò 1 lia̍p he̍k-chheⁿ. I ê kúi-tō kap pa̍t lia̍p he̍k-chheⁿ bô kâng, ke chin chhu, ū-sî-á koh phēng Hái-ông-chheⁿ khah oá Ji̍t-thaû. 1978 nî chhoē tio̍h i siōng toā lia̍p ê oē-chheⁿ Charon, 2005 nî koh chhoē tio̍h lēng-goā 2 lia̍p khah sè lia̍p ê oē-chheⁿ Nix kap Hydra. Kok-chè Thian-bûn Chó͘-ha̍p (IAU) tī 2006 nî 8 goe̍h thong-koè kā Mê-ông-chheⁿ ê tē-ūi ùi he̍k-chheⁿ kàng-ki̍p kàu é-he̍k-chheⁿ (dwarf planet). [1]

Kap pa̍t lia̍p he̍k-chheⁿ sio pí-phēng, Mê-ông-chheⁿ ke chin sè lia̍p, kúi-tō mā chin bô sio-siâng, beh án-choáⁿ kā tēng-ūi chāi-lâi lóng ū cheng-gī. Ná lâi ná chē lâng tông-ì i sī chú-iàu ê he̍k-chheⁿ, iū-koh sī chhù-iàu ê he̍k-chheⁿ. Mê-ông-chheⁿ mā sǹg sī Hái-ông-chheⁿ goā chheⁿ-thé (trans-Neptunian object), in-ūi 2005 nî 7 goe̍h 31 chhoē tio̍h 1 lia̍p Hái-ông-chheⁿ goā chheⁿ-thé 2003 UB₃₁₃, phēng Mê-ông-chheⁿ koh-khah toā lia̍p.

2015 nî, NASA ê thài-khong-chûn New Horizons óa kīn Mê-ông-chheⁿ, hip liáu iú-sú í-lâi pún chheⁿ siāng chheng-chhó ê siòng-phìⁿ, jî-chhiá hoat-hiān Mê-ông-chheⁿ ê ti̍t-kèng pí goân-lâi só͘ thui-chhek koh khah khoah 80 kong-lí ū^[3].

Chham-khó

↑ JPL/NASA (2015-04-22). "What is a Dwarf Planet?". Jet Propulsion Laboratory. 2022-01-19 khòaⁿ--ê.
↑ John Lewis, pian. (2004). Physics and chemistry of the solar system (2 pán.). Elsevier. p. 64.
↑ Pluto: What have we learned so far?. BBC. 2015-07-15.

Goā-pō͘ liân-kiat

NASA's Pluto fact sheet
StudyWorks! Online: Is Pluto a Planet? Archived 2005-03-16 at the Wayback Machine. - summarizes the pros and the cons of classifying Pluto as a planet
David H. Freedman, "When is a Planet Not a Planet?", Atlantic Monthly, February 1998.
NASA's Pluto-Kuiper Belt Mission - launching in early 2006.
Pluto in Science Fiction Archived 2020-10-24 at the Wayback Machine. - Bibliography of science fiction which is set on Pluto.
Pluto/Neptune crossings Archived 2005-12-11 at the Wayback Machine.
Space.com article on second and third moons
NASA's Hubble Reveals Possible New Moons Around Pluto – Hubble Press Release
Possible New Moons

Thài-iông-hē

Chheⁿ: Ji̍t-thâu
He̍k-chheⁿ: Chúi-chheⁿ \| Kim-chheⁿ \| Tē-kiû \| Hóe-chheⁿ \| Bo̍k-chheⁿ \| Thó͘-chheⁿ \| Thian-ông-chheⁿ \| Hái-ông-chheⁿ
É-he̍k-chheⁿ: Ceres \| Mê-ông-chheⁿ \| Haumea \| Makemake \| Eris
Sió-bu̍t-thé: Sió-he̍k-chheⁿ \| Hái-ông-chheⁿ goā chheⁿ-thé \| Tn̂g-boé-chheⁿ
Oē-chheⁿ: Goe̍h-niû \| Hoé-chheⁿ ê \| Bo̍k-chheⁿ ê \| Thó͘-chheⁿ ê \| Thian-ông-chheⁿ ê \| Hái-ông-chheⁿ ê
Tīn: Sió-he̍k-chheⁿ-toà \| Kuiper-toà \| Sàn-loān îⁿ-poâⁿ \| Oort-hûn
Chhiáⁿ chham-khó thian-bûn bu̍t-thé, thài-iông-hē ê chheⁿ-thé lia̍t-toaⁿ, chiàu poàⁿ-kèng pâi iah sī chiàu chit-liōng pâi

Pún bûn-chiuⁿ sī chi̍t phiⁿ phí-á-kiáⁿ. Lí thang tàu khok-chhiong lâi pang-chō͘ Wikipedia.

[1] JPL/NASA (2015-04-22). "What is a Dwarf Planet?". Jet Propulsion Laboratory. 2022-01-19 khòaⁿ--ê.

[2] John Lewis, pian. (2004). Physics and chemistry of the solar system (2 pán.). Elsevier. p. 64.

[3] Pluto: What have we learned so far?. BBC. 2015-07-15.

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