# Ceres (é-he̍k-chheⁿ)

1 Ceres | Ceres in true colour in 2015 |
| Hoat-kiàn |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| Mean diameter | 7005939400000000000♠939.4±0.2 km |
| Pêng-kin poàn-kéng | 7005469730000000000♠469.73 km |
| Piáu-bīn-chek | 7012277000000000000♠2,770,000 km2 |
| Thé-chek | 7017434000000000000♠434,000,000 km3 |
| Chit-liōng | 7020938349999999999♠(9.3835±0.0001)×1020 kg 6996160000000000000♠0.00016 Earths 0.0128 Moons |
| Pêng-kin bi̍t-tō͘ | 7003216200000000000♠2.162±0.008 g/cm3 |
| Equatorial surface gravity | Pang-bô͘:Gr m/s2 0.029 *g* |
| Koàn-sèng in-chú ê lêng-lu̍t | 6999360000000000000♠0.36±0.15 (estimate) |
| Equatorial escape velocity | Pang-bô͘:V2 km/s |
| Hêng-chheⁿ chū-choán chiu-kî | 7004326670120000000♠9.074170±0.000001 h |
| Chhiah-tō chū-choán sok-tō͘ | 7001926100000000000♠92.61 m/s |
| Chhia-sim khi-pêng | ≈4° |
| Pak-ke̍k chhiah-keng | 291.42744° |
| Pak-ke̍k chhiah-hūi | 66.76033° |
| Geometric albedo | 6998900000000000000♠0.090±0.0033 (V-band) |
|

| Piáu-bīn un-tō͘ | siōng-kē | pêng-kin | siōng-koân |
| --- | --- | --- | --- |
| Kelvin | ≈110 |  | 235±4 |

 |
| Spectral type | C |
| Bêng-hián-tō͘ | * 7.6
* 9.27 July 2021
 |
| Absolute magnitude *(H)* | 7000334000000000000♠3.34 |
| Kak-ti̍t-kèng | 0.854″ to 0.339″ |
|  |

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

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

## Tsù-kái

| 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 |