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.
Quick facts Hoat-kiàn, Hoat-kiàn-chiá ...
Hái-ông-chheⁿ  |
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| Hoat-kiàn-chiá |
- Johann Galle
- Urbain Le Verrier
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| Hoat-kiàn ji̍t-chí | 23 September 1846 |
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Hō-miâ iû-lâi | Latin Neptūnus, via French Neptune |
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| Goân-kî J2000 |
| Aphelion | 30.33 astronomical units (4.54×10^9 km) |
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| Kīn-ji̍t-tiám | 29.81 astronomical units (4.46×10^9 km) |
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| 30.07 astronomical units (4.50×10^9 km) |
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| Lî-sim-lu̍t | 6997867800000000000♠0.008678 |
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Kúi-tō chiu-kî |
- 164.8 yr
- 60,182 days
- 89,666 Neptunian solar days
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Hōe-ha̍p chiu-kî | 367.49 days |
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Pêng-kin kúi-tō sok-le̍k | 7003543000000000000♠5.43 km/s |
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Pêng-kin kīn-tiám-kak | 7000447202223580004♠256.228° |
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| Khi-pêng | 6998308569848429468♠1.767975° to ecliptic
6.43° to Sun's equator
0.72° to invariable plane |
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Seng-kau-tiám ê keng-tō͘ | 7000230006470144821♠131.784° |
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Time of periastron | 2042-Sep-04 |
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Hn̄g-tiám ê ín-sò͘ | 7000482297304179106♠276.336° |
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| Known satellites | 14 |
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Pêng-kin poàn-kéng | 7007246220000000000♠24,622±19 km |
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| 7007247640000000000♠24,764±15 km
3.883 Earths |
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Ke̍k-tē poàn-kéng | 7007243410000000000♠24,341±30 km
3.829 Earths |
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| Píⁿ-pêⁿ-lu̍t | 6998171000000000000♠0.0171±0.0013 |
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Piáu-bīn-chek | 7015761830000000000♠7.6183×109 km2
14.98 Earths |
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| Thé-chek | 7022625399999999999♠6.254×1013 km3
57.74 Earths |
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| Chit-liōng | 7026102413000000000♠1.02413×1026 kg
17.147 Earths
5.15×10-5 Suns |
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| 7003163800000000000♠1.638 g/cm3 |
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Piáu-bīn tiōng-le̍k | 11.15 m/s2
1.14 g |
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Koàn-sèng in-chú ê lêng-lu̍t | 6999230000000000000♠0.23 (estimate) |
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Thoat-cháu so̍k-tō͘ | 23.5 km/s |
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Hêng-chheⁿ chū-choán chiu-kî | 0.6713 day
16 h 6 min 36 s |
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Chhiah-tō chū-choán sok-tō͘ | 2.68 km/s (9,650 km/h) |
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Chhia-sim khi-pêng | 28.32° (to orbit) |
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Pak-ke̍k chhiah-keng | 19h 57m 20s
299.3° |
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Pak-ke̍k chhiah-hūi | 42.950° |
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| Hoán-siā-lu̍t | 0.290 (bond)
0.442 (geom.) |
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| Piáu-bīn un-tō͘ |
siōng-kē |
pêng-kin |
siōng-koân |
| 1 bar level |
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72 K (−201 °C) |
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| 0.1 bar (10 kPa) |
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55 K (−218 °C) |
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Bêng-hián-tō͘ | 7.67 to 8.00 |
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Kak-ti̍t-kèng | 2.2–2.4″ |
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Scale height | 7004197000000000000♠19.7±0.6 km |
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| Thé-chek cho͘-sêng |
- Khì-thé:
- 6999800000000000000♠80%±3.2% chúi-sò͘ (H
2)
- 6999190000000000000♠19%±3.2% helium (He)
- 6998150000000000000♠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)
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Close
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).
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