Ceres (é-he̍k-chheⁿ)

1 Ceres (hû-hō: )^[17] sī 1 lia̍p tiàm tī sió-he̍k-chheⁿ-toà ê é-he̍k-chheⁿ, hoat-hiān-jîn sī Giuseppe Piazzi, tī 1801 nî. Ceres sī Lô-má cha-bó͘ sîn-bêng ê miâ.

1 Ceres

Ceres in true colour in 2015
Hoat-kiàn[1]
Hoat-kiàn-chiá	Giuseppe Piazzi
Hoat-kiàn ji̍t-chí	1 January 1801
Miâ-hō
MPC miâ-hō	1 Ceres
Ho͘-im	/ˈsɪəriːz/
Hō-miâ iû-lâi	Cerēs
Minor planet category	dwarf planet, asteroid
Adjectives	Cererian, -ean (/sɪˈrɪəriən/)
Kúi-tō sèng-chit[2]
Goân-kî 21 January 2022 (JD 2459600.5 )
Aphelion	2.98 astronomical units (446×10^6 km)
Kīn-ji̍t-tiám	2.55 astronomical units (381×10^6 km)
Pòaⁿ-tn̂g chhia-sim	2.77 astronomical units (414×10^6 km)
Lî-sim-lu̍t	6998785000000000000♠0.0785
Kúi-tō chiu-kî	4.60 yr 7008145152000000000♠1680 d
Hōe-ha̍p chiu-kî	1.28 yr 466.6 d[3]
Pêng-kin kúi-tō sok-le̍k	7004179000000000000♠17.9 km/s
Pêng-kin kīn-tiám-kak	7000508588944031148♠291.4°
Khi-pêng	6999185004900711399♠10.6° to ecliptic 9.20° to invariable plane[4]
Seng-kau-tiám ê keng-tō͘	7000140149938935144♠80.3°
Time of periastron	7 December 2022
Hn̄g-tiám ê ín-sò͘	7000128456232946782♠73.6°
Proper orbital elements[5]
Proper Pòaⁿ-tn̂g chhia-sim	7000277000000000000♠2.77 AU
Proper eccentricity	6999116000000000000♠0.116
Proper inclination	6999168424272817453♠9.65°
Proper mean motion	78.2 deg / yr
Proper orbital period	4.60358 yr (1681.458 d)
Precession of perihelion	7001541000000000000♠54.1 arcsec / yr
Precession of the ascending node	2998408000000000000♠−59.2 arcsec / yr
Physical characteristics
Dimensions	(964.4 × 964.2 × 891.8) ± 0.2 km[2]
Mean diameter	7005939400000000000♠939.4±0.2 km[2]
Pêng-kin poàn-kéng	7005469730000000000♠469.73 km[6]
Piáu-bīn-chek	7012277000000000000♠2,770,000 km2[d]
Thé-chek	7017434000000000000♠434,000,000 km3[d]
Chit-liōng	7020938349999999999♠(9.3835±0.0001)×1020 kg[2] 6996160000000000000♠0.00016 Earths 0.0128 Moons
Pêng-kin bi̍t-tō͘	7003216200000000000♠2.162±0.008 g/cm3[2]
Equatorial surface gravity	Pang-bô͘:Gr m/s2[d] 0.029 g
Koàn-sèng in-chú ê lêng-lu̍t	6999360000000000000♠0.36±0.15[7][lower-alpha 1] (estimate)
Equatorial escape velocity	Pang-bô͘:V2 km/s[d]
Hêng-chheⁿ chū-choán chiu-kî	7004326670120000000♠9.074170±0.000001 h[2]
Chhiah-tō chū-choán sok-tō͘	7001926100000000000♠92.61 m/s[d]
Chhia-sim khi-pêng	≈4°[9]
Pak-ke̍k chhiah-keng	291.42744°[10]
Pak-ke̍k chhiah-hūi	66.76033°[6]
Geometric albedo	6998900000000000000♠0.090±0.0033 (V-band)[11]
Piáu-bīn un-tō͘ siōng-kē pêng-kin siōng-koân Kelvin ≈110[12] 235±4[13]
Spectral type	C[14]
Bêng-hián-tō͘	7.6[15] 9.27 July 2021[16]
Absolute magnitude (H)	7000334000000000000♠3.34[2]
Kak-ti̍t-kèng	0.854″ to 0.339″

Phēng toā-sè: 4 Vesta, 1 Ceres (tiong-ng), Goe̍h-niû

19 sè-kí chhím hoat-hiān ê sî, lâng lia̍h-chún i hām kî-thaⁿ ê he̍k-chheⁿ sio siâng, só͘-í kā i tòng-chò 1 lia̍p he̍k-chheⁿ. Boé--á khah liáu-kái i ê sèng-chit liáu-aū, tō kā lia̍t chò sió-he̍k-chheⁿ. Sui-bóng 1 Ceres ti̍t-kèng chiah 950 km, i si̍t-chāi sī Thài-iông-hē 13 bān lia̍p sió-he̍k-chheⁿ tang-tiong, siōng kài toā lia̍p, chit-liōng siōng chē, hêng siōng îⁿ ê 1 lia̍p, ē-sái kóng sió-he̍k-chheⁿ-toà ū 3-hūn-1 ê chit-liōng tī i hia. In-ūi án-ne, 2006 nî 8 goe̍h thian-bûn-ha̍k-kài koh kā i kái lia̍t chò 1 lia̍p "é-he̍k-chheⁿ".

Tsù-sik

1. The value given for Ceres is the mean moment of inertia, which is thought to better represent its interior structure than the polar moment of inertia, due to its high polar flattening.^[8]