Hái-ông-chheⁿ

**Hái-ông-chheⁿ**
Hoat-kiàn
Hoat-kiàn-chiá	Johann Galle; Urbain Le Verrier;
Hoat-kiàn ji̍t-chí	23 September 1846
Miâ-hō
Hō-miâ iû-lâi	Latin Neptūnus, via French Neptune
Kúi-tō sèng-chit
	Goân-kî J2000
Aphelion	30.33 astronomical units (4.54×109 km)
Kīn-ji̍t-tiám	29.81 astronomical units (4.46×109 km)
Pòaⁿ-tn̂g chhia-sim	30.07 astronomical units (4.50×109 km)
Lî-sim-lu̍t	0.008678
Kúi-tō chiu-kî	164.8 yr; 60,182 days; 89,666 Neptunian solar days;
Hōe-ha̍p chiu-kî	367.49 days
Pêng-kin kúi-tō sok-le̍k	5.43 km/s
Pêng-kin kīn-tiám-kak	256.228°
Khi-pêng	1.767975° to ecliptic; 6.43° to Sun's equator; 0.72° to invariable plane
Seng-kau-tiám ê keng-tō͘	131.784°
Time of periastron	2042-Sep-04
Hn̄g-tiám ê ín-sò͘	276.336°
Known satellites	14
Bu̍t-lí sèn-chit
Pêng-kin poàn-kéng	24,622±19 km
Chhiah-tō poàn-kéng	24,764±15 km; 3.883 Earths
Ke̍k-tē poàn-kéng	24,341±30 km; 3.829 Earths
Píⁿ-pêⁿ-lu̍t	0.0171±0.0013
Piáu-bīn-chek	7.6183×109 km2; 14.98 Earths
Thé-chek	6.254×1013 km3; 57.74 Earths
Chit-liōng	1.02413×1026 kg; 17.147 Earths; 5.15×10-5 Suns
Pêng-kin bi̍t-tō͘	1.638 g/cm3
Piáu-bīn tiōng-le̍k	11.15 m/s2; 1.14 g
Koàn-sèng in-chú ê lêng-lu̍t	0.23 (estimate)
Thoat-cháu so̍k-tō͘	23.5 km/s
Hêng-chheⁿ chū-choán chiu-kî	0.6713 day; 16 h 6 min 36 s
Chhiah-tō chū-choán sok-tō͘	2.68 km/s (9,650 km/h)
Chhia-sim khi-pêng	28.32° (to orbit)
Pak-ke̍k chhiah-keng	19h 57m 20s; 299.3°
Pak-ke̍k chhiah-hūi	42.950°
Hoán-siā-lu̍t	0.290 (bond); 0.442 (geom.)
Bêng-hián-tō͘	7.67 to 8.00
Kak-ti̍t-kèng	2.2–2.4″
Tāi-khì-khoan
Scale height	19.7±0.6 km
Thé-chek cho͘-sêng	; Khì-thé:; 80%±3.2% chúi-sò͘ (H; 2); 19%±3.2% helium (He); 1.5%±0.5% methane (CH; 4); ~0.019% tiōng-chúi-sò͘-hòa chúi-sò͘ (HD); ~0.00015% ethane (C; 2H; 6); Peng:; a-mó͘-ní-á (NH; 3); chúi (H; 2O); liû-hòa chúi-sò͘ ammonium (NH; 4SH); methane peng (?) (CH; 4·5.75H2O);

Hái-ông-chheⁿ (海王星, Eng-gí: Neptune) sī lī Ji̍t-thaû tē 8 hn̄g ê he̍k-chheⁿ, m̄-koh sam-sî ē chaú kah tē 9 hn̄g khì, in-ūi Mê-ông-chheⁿ ê kúi-tō ū khah te̍k-sû. I mā si Thài-iông-hē siōng goā-khaú, siōng sè lia̍p ê khì-thé toā he̍k-chheⁿ (gas giant). Sè bóng sè, Hái-ông-chheⁿ ê chit-liōng khah chē Thiⁿ-ông-chheⁿ, in-ūi tāng-le̍k-tiûⁿ (gravitational field) tì-sú i ê bi̍t-tō͘ ū khah koân.

Hái-ông-chheⁿ ê miâ-jī sī toè Lô-má hái-sîn lâi--ê. Tāi-piáu hû-hō sī hái-sîn ê bú-khì saⁿ-chhe-kek (trident) ♆. 1846 nî 9 goe̍h 23 hông hoat-hiān. 1989 nî 8 goe̍h 25, Voyager 2 ùi i piⁿ--á poe koè.

Chit lia̍p nâ-sek ê he̍k-chheⁿ chhan-chhiūⁿ Thó͘-chheⁿ mā ū khoân, khah bô ióng-kò͘ tō sī. Voyager 2 hoat-kak chiah-ê khoân ê kiat-kò͘ mā kài oân-chéng. Hái-ông-chheⁿ téng-koân ê hong-sok ē-tit kaù kah 2,000 km/h. Khong-khì lāi-té ū H₂, (hydrogen), He₂ (helium), kap CH₄ (methane, chiau-khì) hō͘ i khoàⁿ--khí-laî nâ-nâ. 1989 nî Voyager 2 poe koè ê sî khoàⁿ tio̍h i ê lâm-poàⁿ-kiû ū 1 ê Toā-o͘-tiám (Great Dark Spot), bē-su Bo̍k-ông-chheⁿ ê Toā-âng-tiám, m̄-koh boé-chhiú soah bô--khì. Hái-ông-chheⁿ ū 13 lia̍p oē-chheⁿ, lāi-té 5 lia̍p iáu ū koá cheng-gī. Siōng toā lia̍p ê oē-chheⁿ Triton chin sim-sek, tò-thaû-hiòng ê kúi-tō, Thài-iông-hē siōng-kài léng (38K) ê chheⁿ-thé, N₂ (nitrogen, chit-sò͘) kap CH₄ kò͘-sêng ê tāi-khì-chân po̍h-po̍h-po̍h (14 microbar).

Goā-pō͘ liân-kiat[siu-kái | kái goân-sí-bé]

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.