メタデータ
| 項目 |
値 |
| Designation |
C/2008 C1 (Chen-Gao) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-04-16T20:25:39.135360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:16Z |
| Obs used |
754 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
5.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-03-06.0000000 |
| e |
1.00000066 |
| q (au) |
1.262346 |
| a (au) |
-1909647.271764 |
| i (deg) |
61.784520 |
| Ω (om, deg) |
307.782377 |
| ω (w, deg) |
180.928392 |
| M (ma, deg) |
-0.000000 |
等級
散乱 + 全体線形
$$
M_a = (12.986 + 2.066\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.986 |
| n |
2.066 |
| gf |
0.999 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2008-01-30 |
2008-04-16 |
+12.3117 |
-3.108 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
20:24:45.87 |
-37:40:55.3 |
HIP 100584 |
15.47 |
| 2026-05-12 12:00 |
20:24:44.79 |
-37:41:10.7 |
HIP 100584 |
15.50 |
| 2026-05-13 00:00 |
20:24:43.67 |
-37:41:26.2 |
HIP 100584 |
15.54 |
| 2026-05-13 12:00 |
20:24:42.52 |
-37:41:41.7 |
HIP 100584 |
15.58 |
| 2026-05-14 00:00 |
20:24:41.34 |
-37:41:57.3 |
HIP 100584 |
15.62 |
| 2026-05-14 12:00 |
20:24:40.13 |
-37:42:12.9 |
HIP 100584 |
15.67 |
| 2026-05-15 00:00 |
20:24:38.89 |
-37:42:28.6 |
HIP 100584 |
15.72 |
| 2026-05-15 12:00 |
20:24:37.61 |
-37:42:44.3 |
HIP 100584 |
15.78 |
| 2026-05-16 00:00 |
20:24:36.30 |
-37:43:00.1 |
HIP 100584 |
15.84 |
| 2026-05-16 12:00 |
20:24:34.96 |
-37:43:15.9 |
HIP 100584 |
15.91 |
| 2026-05-17 00:00 |
20:24:33.59 |
-37:43:31.7 |
HIP 100584 |
15.98 |
| 2026-05-17 12:00 |
20:24:32.19 |
-37:43:47.6 |
HIP 100584 |
16.06 |
| 2026-05-18 00:00 |
20:24:30.76 |
-37:44:03.5 |
HIP 100584 |
16.15 |
| 2026-05-18 12:00 |
20:24:29.29 |
-37:44:19.5 |
HIP 100584 |
16.24 |
| 2026-05-19 00:00 |
20:24:27.79 |
-37:44:35.5 |
HIP 100584 |
16.34 |
| 2026-05-19 12:00 |
20:24:26.27 |
-37:44:51.5 |
HIP 100584 |
16.45 |
| 2026-05-20 00:00 |
20:24:24.71 |
-37:45:07.6 |
HIP 100584 |
16.56 |
| 2026-05-20 12:00 |
20:24:23.12 |
-37:45:23.7 |
HIP 100584 |
16.68 |
| 2026-05-21 00:00 |
20:24:21.50 |
-37:45:39.8 |
HIP 100584 |
16.81 |
| 2026-05-21 12:00 |
20:24:19.85 |
-37:45:56.0 |
HIP 100584 |
16.95 |
| 2026-05-22 00:00 |
20:24:18.17 |
-37:46:12.1 |
HIP 100584 |
17.09 |
| 2026-05-22 12:00 |
20:24:16.46 |
-37:46:28.3 |
HIP 100584 |
17.24 |
| 2026-05-23 00:00 |
20:24:14.72 |
-37:46:44.6 |
HIP 100584 |
17.40 |
| 2026-05-23 12:00 |
20:24:12.95 |
-37:47:00.8 |
HIP 100584 |
17.57 |
| 2026-05-24 00:00 |
20:24:11.15 |
-37:47:17.1 |
HIP 100584 |
17.75 |
| 2026-05-24 12:00 |
20:24:09.33 |
-37:47:33.3 |
HIP 100584 |
17.93 |
| 2026-05-25 00:00 |
20:24:07.47 |
-37:47:49.6 |
HIP 100584 |
18.13 |
| 2026-05-25 12:00 |
20:24:05.58 |
-37:48:06.0 |
HIP 100584 |
18.33 |
| 2026-05-26 00:00 |
20:24:03.66 |
-37:48:22.3 |
HIP 100584 |
18.54 |
| 2026-05-26 12:00 |
20:24:01.72 |
-37:48:38.6 |
HIP 100584 |
18.76 |
| 2026-05-27 00:00 |
20:23:59.74 |
-37:48:55.0 |
HIP 100584 |
18.99 |
| 2026-05-27 12:00 |
20:23:57.74 |
-37:49:11.4 |
HIP 100584 |
19.23 |
| 2026-05-28 00:00 |
20:23:55.71 |
-37:49:27.7 |
HIP 100584 |
19.48 |
| 2026-05-28 12:00 |
20:23:53.65 |
-37:49:44.1 |
HIP 100584 |
19.73 |
| 2026-05-29 00:00 |
20:23:51.56 |
-37:50:00.5 |
HIP 100584 |
20.00 |
| 2026-05-29 12:00 |
20:23:49.44 |
-37:50:16.9 |
HIP 100584 |
20.27 |
| 2026-05-30 00:00 |
20:23:47.30 |
-37:50:33.3 |
HIP 100584 |
20.55 |
| 2026-05-30 12:00 |
20:23:45.12 |
-37:50:49.7 |
HIP 100584 |
20.84 |
| 2026-05-31 00:00 |
20:23:42.92 |
-37:51:06.1 |
HIP 100584 |
21.14 |
| 2026-05-31 12:00 |
20:23:40.70 |
-37:51:22.5 |
HIP 100584 |
21.45 |
| 2026-06-01 00:00 |
20:23:38.44 |
-37:51:38.9 |
HIP 100584 |
21.77 |
| 2026-06-01 12:00 |
20:23:36.16 |
-37:51:55.2 |
HIP 100584 |
22.09 |
| 2026-06-02 00:00 |
20:23:33.85 |
-37:52:11.6 |
HIP 100433 |
22.05 |