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) |
| 2026-06-01 00:00 |
16:00:23.94 |
-24:05:55.0 |
HIP 78482 |
12.86 |
| 2026-06-01 12:00 |
16:00:03.82 |
-24:05:20.2 |
HIP 78482 |
17.12 |
| 2026-06-02 00:00 |
15:59:43.74 |
-24:04:45.1 |
HIP 78251 |
18.60 |
| 2026-06-02 12:00 |
15:59:23.70 |
-24:04:09.7 |
HIP 78251 |
14.60 |
| 2026-06-03 00:00 |
15:59:03.70 |
-24:03:34.1 |
HIP 78251 |
11.10 |
| 2026-06-03 12:00 |
15:58:43.75 |
-24:02:58.2 |
HIP 78251 |
8.69 |
| 2026-06-04 00:00 |
15:58:23.85 |
-24:02:22.1 |
HIP 78251 |
8.36 |
| 2026-06-04 12:00 |
15:58:04.00 |
-24:01:45.8 |
HIP 78251 |
10.30 |
| 2026-06-05 00:00 |
15:57:44.21 |
-24:01:09.2 |
HIP 78251 |
13.56 |
| 2026-06-05 12:00 |
15:57:24.47 |
-24:00:32.5 |
HIP 78251 |
17.41 |
| 2026-06-06 00:00 |
15:57:04.80 |
-23:59:55.5 |
HIP 78227 |
21.01 |
| 2026-06-06 12:00 |
15:56:45.19 |
-23:59:18.4 |
HIP 78083 |
20.93 |
| 2026-06-07 00:00 |
15:56:25.65 |
-23:58:41.1 |
HIP 78083 |
21.65 |
| 2026-06-07 12:00 |
15:56:06.17 |
-23:58:03.6 |
HIP 77905 |
20.51 |
| 2026-06-08 00:00 |
15:55:46.77 |
-23:57:25.9 |
HIP 77905 |
16.05 |
| 2026-06-08 12:00 |
15:55:27.45 |
-23:56:48.1 |
HIP 77905 |
11.61 |
| 2026-06-09 00:00 |
15:55:08.20 |
-23:56:10.1 |
HIP 77905 |
7.22 |
| 2026-06-09 12:00 |
15:54:49.03 |
-23:55:32.0 |
HIP 77905 |
3.02 |
| 2026-06-10 00:00 |
15:54:29.95 |
-23:54:53.8 |
HIP 77905 |
2.27 |
| 2026-06-10 12:00 |
15:54:10.95 |
-23:54:15.5 |
HIP 77859 |
5.61 |
| 2026-06-11 00:00 |
15:53:52.04 |
-23:53:37.1 |
HIP 77859 |
5.14 |
| 2026-06-11 12:00 |
15:53:33.23 |
-23:52:58.5 |
HIP 77859 |
7.70 |
| 2026-06-12 00:00 |
15:53:14.51 |
-23:52:19.9 |
HIP 77859 |
11.39 |
| 2026-06-12 12:00 |
15:52:55.88 |
-23:51:41.3 |
HIP 77859 |
15.39 |
| 2026-06-13 00:00 |
15:52:37.36 |
-23:51:02.5 |
HIP 77859 |
19.50 |
| 2026-06-13 12:00 |
15:52:18.94 |
-23:50:23.7 |
HIP 77859 |
23.65 |
| 2026-06-14 00:00 |
15:52:00.62 |
-23:49:44.9 |
HIP 77617 |
20.32 |
| 2026-06-14 12:00 |
15:51:42.42 |
-23:49:06.0 |
HIP 77617 |
17.29 |
| 2026-06-15 00:00 |
15:51:24.32 |
-23:48:27.1 |
HIP 77617 |
14.86 |
| 2026-06-15 12:00 |
15:51:06.34 |
-23:47:48.2 |
HIP 77617 |
13.35 |
| 2026-06-16 00:00 |
15:50:48.47 |
-23:47:09.4 |
HIP 77617 |
13.04 |
| 2026-06-16 12:00 |
15:50:30.73 |
-23:46:30.5 |
HIP 77617 |
14.00 |
| 2026-06-17 00:00 |
15:50:13.10 |
-23:45:51.6 |
HIP 77617 |
15.98 |
| 2026-06-17 12:00 |
15:49:55.60 |
-23:45:12.8 |
HIP 77617 |
18.63 |
| 2026-06-18 00:00 |
15:49:38.23 |
-23:44:34.0 |
HIP 77435 |
17.26 |
| 2026-06-18 12:00 |
15:49:20.98 |
-23:43:55.3 |
HIP 77435 |
13.85 |
| 2026-06-19 00:00 |
15:49:03.87 |
-23:43:16.7 |
HIP 77435 |
10.87 |
| 2026-06-19 12:00 |
15:48:46.89 |
-23:42:38.1 |
HIP 77435 |
8.73 |
| 2026-06-20 00:00 |
15:48:30.04 |
-23:41:59.6 |
HIP 77435 |
8.08 |
| 2026-06-20 12:00 |
15:48:13.33 |
-23:41:21.2 |
HIP 77435 |
9.21 |
| 2026-06-21 00:00 |
15:47:56.76 |
-23:40:42.9 |
HIP 77435 |
11.57 |
| 2026-06-21 12:00 |
15:47:40.34 |
-23:40:04.8 |
HIP 77435 |
14.55 |
| 2026-06-22 00:00 |
15:47:24.05 |
-23:39:26.7 |
HIP 77435 |
17.82 |