メタデータ
| 項目 |
値 |
| Designation |
108P/Ciffreo |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-11T05:28:33.585600Z |
| Orbit solution date (soln_date, UTC) |
2022-08-16T21:15:23Z |
| Obs used |
2301 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
19.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-05-19.0000000 |
| e |
0.58101345 |
| q (au) |
1.526125 |
| a (au) |
3.642420 |
| i (deg) |
13.980156 |
| Ω (om, deg) |
52.402395 |
| ω (w, deg) |
356.861707 |
| M (ma, deg) |
184.017042 |
等級
散乱 + 全体線形
$$
M_a = (11.226 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.226 |
| n |
6.000 |
| gf |
1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:35:33.29 |
-23:08:07.5 |
HIP 76268 |
24.85 |
| 2026-07-29 12:00 |
15:35:31.14 |
-23:08:01.0 |
HIP 76268 |
24.52 |
| 2026-07-30 00:00 |
15:35:29.20 |
-23:07:55.1 |
HIP 76268 |
24.23 |
| 2026-07-30 12:00 |
15:35:27.45 |
-23:07:49.8 |
HIP 76268 |
23.97 |
| 2026-07-31 00:00 |
15:35:25.92 |
-23:07:45.1 |
HIP 76268 |
23.75 |
| 2026-07-31 12:00 |
15:35:24.58 |
-23:07:41.0 |
HIP 76268 |
23.55 |
| 2026-08-01 00:00 |
15:35:23.45 |
-23:07:37.5 |
HIP 76268 |
23.39 |
| 2026-08-01 12:00 |
15:35:22.53 |
-23:07:34.6 |
HIP 76268 |
23.26 |
| 2026-08-02 00:00 |
15:35:21.81 |
-23:07:32.4 |
HIP 76268 |
23.16 |
| 2026-08-02 12:00 |
15:35:21.29 |
-23:07:30.8 |
HIP 76268 |
23.09 |
| 2026-08-03 00:00 |
15:35:20.97 |
-23:07:29.8 |
HIP 76268 |
23.05 |
| 2026-08-03 12:00 |
15:35:20.86 |
-23:07:29.4 |
HIP 76268 |
23.03 |
| 2026-08-04 00:00 |
15:35:20.95 |
-23:07:29.6 |
HIP 76268 |
23.04 |
| 2026-08-04 12:00 |
15:35:21.24 |
-23:07:30.4 |
HIP 76268 |
23.08 |
| 2026-08-05 00:00 |
15:35:21.73 |
-23:07:31.9 |
HIP 76268 |
23.15 |
| 2026-08-05 12:00 |
15:35:22.43 |
-23:07:34.0 |
HIP 76268 |
23.25 |
| 2026-08-06 00:00 |
15:35:23.32 |
-23:07:36.7 |
HIP 76268 |
23.37 |
| 2026-08-06 12:00 |
15:35:24.42 |
-23:07:40.1 |
HIP 76268 |
23.53 |
| 2026-08-07 00:00 |
15:35:25.72 |
-23:07:44.0 |
HIP 76268 |
23.71 |
| 2026-08-07 12:00 |
15:35:27.22 |
-23:07:48.6 |
HIP 76268 |
23.93 |
| 2026-08-08 00:00 |
15:35:28.92 |
-23:07:53.8 |
HIP 76268 |
24.18 |
| 2026-08-08 12:00 |
15:35:30.82 |
-23:07:59.7 |
HIP 76268 |
24.47 |
| 2026-08-09 00:00 |
15:35:32.92 |
-23:08:06.2 |
HIP 76268 |
24.79 |
| 2026-08-09 12:00 |
15:35:35.22 |
-23:08:13.3 |
HIP 76268 |
25.14 |
| 2026-08-10 00:00 |
15:35:37.72 |
-23:08:21.0 |
HIP 76268 |
25.54 |
| 2026-08-10 12:00 |
15:35:40.42 |
-23:08:29.4 |
HIP 76268 |
25.98 |
| 2026-08-11 00:00 |
15:35:43.32 |
-23:08:38.4 |
HIP 76268 |
26.46 |
| 2026-08-11 12:00 |
15:35:46.42 |
-23:08:48.0 |
HIP 76268 |
26.98 |
| 2026-08-12 00:00 |
15:35:49.71 |
-23:08:58.2 |
HIP 76532 |
27.21 |
| 2026-08-12 12:00 |
15:35:53.20 |
-23:09:09.1 |
HIP 76532 |
26.41 |
| 2026-08-13 00:00 |
15:35:56.89 |
-23:09:20.6 |
HIP 76532 |
25.57 |
| 2026-08-13 12:00 |
15:36:00.78 |
-23:09:32.7 |
HIP 76532 |
24.68 |
| 2026-08-14 00:00 |
15:36:04.86 |
-23:09:45.4 |
HIP 76532 |
23.76 |
| 2026-08-14 12:00 |
15:36:09.13 |
-23:09:58.8 |
HIP 76532 |
22.79 |
| 2026-08-15 00:00 |
15:36:13.60 |
-23:10:12.8 |
HIP 76532 |
21.78 |
| 2026-08-15 12:00 |
15:36:18.27 |
-23:10:27.4 |
HIP 76532 |
20.73 |
| 2026-08-16 00:00 |
15:36:23.12 |
-23:10:42.6 |
HIP 76532 |
19.65 |
| 2026-08-16 12:00 |
15:36:28.17 |
-23:10:58.4 |
HIP 76532 |
18.53 |
| 2026-08-17 00:00 |
15:36:33.42 |
-23:11:14.9 |
HIP 76532 |
17.38 |
| 2026-08-17 12:00 |
15:36:38.85 |
-23:11:31.9 |
HIP 76532 |
16.20 |
| 2026-08-18 00:00 |
15:36:44.47 |
-23:11:49.6 |
HIP 76532 |
14.99 |
| 2026-08-18 12:00 |
15:36:50.29 |
-23:12:07.8 |
HIP 76532 |
13.77 |
| 2026-08-19 00:00 |
15:36:56.29 |
-23:12:26.7 |
HIP 76532 |
12.54 |