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[4]
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[2]
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[3]
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[4]
Mean diameter	7005939400000000000♠939.4±0.2 km[4]
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[4] 6996160000000000000♠0.00016 Earths 0.0128 Moons
Pêng-kin bi̍t-tō͘	7003216200000000000♠2.162±0.008 g/cm3[4]
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[4]
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[15] 235±4[16]
Spectral type	C[12]
Bêng-hián-tō͘	7.6[13] 9.27 July 2021[14]
Absolute magnitude (H)	7000334000000000000♠3.34[4]
Kak-ti̍t-kèng	0.854″ to 0.339″

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".