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) |
| 2026-09-20 00:00 |
15:49:19.76 |
-23:51:17.4 |
HIP 77435 |
12.20 |
| 2026-09-20 12:00 |
15:49:36.47 |
-23:52:08.9 |
HIP 77435 |
16.10 |
| 2026-09-21 00:00 |
15:49:53.31 |
-23:53:00.8 |
HIP 77617 |
13.66 |
| 2026-09-21 12:00 |
15:50:10.29 |
-23:53:53.0 |
HIP 77617 |
9.99 |
| 2026-09-22 00:00 |
15:50:27.41 |
-23:54:45.6 |
HIP 77617 |
6.64 |
| 2026-09-22 12:00 |
15:50:44.67 |
-23:55:38.5 |
HIP 77617 |
4.52 |
| 2026-09-23 00:00 |
15:51:02.06 |
-23:56:31.8 |
HIP 77617 |
5.45 |
| 2026-09-23 12:00 |
15:51:19.59 |
-23:57:25.4 |
HIP 77617 |
8.52 |
| 2026-09-24 00:00 |
15:51:37.25 |
-23:58:19.4 |
HIP 77617 |
12.24 |
| 2026-09-24 12:00 |
15:51:55.04 |
-23:59:13.7 |
HIP 77617 |
16.19 |
| 2026-09-25 00:00 |
15:52:12.97 |
-24:00:08.4 |
HIP 77617 |
20.25 |
| 2026-09-25 12:00 |
15:52:31.02 |
-24:01:03.4 |
HIP 77859 |
19.52 |
| 2026-09-26 00:00 |
15:52:49.21 |
-24:01:58.7 |
HIP 77859 |
15.58 |
| 2026-09-26 12:00 |
15:53:07.53 |
-24:02:54.4 |
HIP 77859 |
11.82 |
| 2026-09-27 00:00 |
15:53:25.97 |
-24:03:50.4 |
HIP 77859 |
8.56 |
| 2026-09-27 12:00 |
15:53:44.55 |
-24:04:46.6 |
HIP 77859 |
6.62 |
| 2026-09-28 00:00 |
15:54:03.25 |
-24:05:43.2 |
HIP 77859 |
7.24 |
| 2026-09-28 12:00 |
15:54:22.08 |
-24:06:40.1 |
HIP 77859 |
9.98 |
| 2026-09-29 00:00 |
15:54:41.03 |
-24:07:37.3 |
HIP 77905 |
11.09 |
| 2026-09-29 12:00 |
15:55:00.12 |
-24:08:34.9 |
HIP 77905 |
13.15 |
| 2026-09-30 00:00 |
15:55:19.32 |
-24:09:32.7 |
HIP 77905 |
16.22 |
| 2026-09-30 12:00 |
15:55:38.65 |
-24:10:30.7 |
HIP 78083 |
16.54 |
| 2026-10-01 00:00 |
15:55:58.11 |
-24:11:29.1 |
HIP 78083 |
12.50 |
| 2026-10-01 12:00 |
15:56:17.69 |
-24:12:27.8 |
HIP 78083 |
8.93 |
| 2026-10-02 00:00 |
15:56:37.39 |
-24:13:26.7 |
HIP 78083 |
6.72 |
| 2026-10-02 12:00 |
15:56:57.21 |
-24:14:25.9 |
HIP 78083 |
7.27 |
| 2026-10-03 00:00 |
15:57:17.15 |
-24:15:25.4 |
HIP 78083 |
10.19 |
| 2026-10-03 12:00 |
15:57:37.22 |
-24:16:25.2 |
HIP 78083 |
14.10 |
| 2026-10-04 00:00 |
15:57:57.40 |
-24:17:25.2 |
HIP 78083 |
18.39 |
| 2026-10-04 12:00 |
15:58:17.71 |
-24:18:25.5 |
HIP 78083 |
22.88 |
| 2026-10-05 00:00 |
15:58:38.13 |
-24:19:26.0 |
HIP 78251 |
24.97 |
| 2026-10-05 12:00 |
15:58:58.67 |
-24:20:26.8 |
HIP 78251 |
26.49 |
| 2026-10-06 00:00 |
15:59:19.33 |
-24:21:27.8 |
HIP 78471 |
25.37 |
| 2026-10-06 12:00 |
15:59:40.10 |
-24:22:29.1 |
HIP 78471 |
21.07 |
| 2026-10-07 00:00 |
16:00:01.00 |
-24:23:30.6 |
HIP 78471 |
17.03 |
| 2026-10-07 12:00 |
16:00:22.00 |
-24:24:32.3 |
HIP 78471 |
13.53 |
| 2026-10-08 00:00 |
16:00:43.12 |
-24:25:34.3 |
HIP 78471 |
11.14 |
| 2026-10-08 12:00 |
16:01:04.36 |
-24:26:36.5 |
HIP 78471 |
10.65 |
| 2026-10-09 00:00 |
16:01:25.70 |
-24:27:38.9 |
HIP 78510 |
8.81 |
| 2026-10-09 12:00 |
16:01:47.16 |
-24:28:41.5 |
HIP 78510 |
9.30 |
| 2026-10-10 00:00 |
16:02:08.73 |
-24:29:44.4 |
HIP 78510 |
12.07 |
| 2026-10-10 12:00 |
16:02:30.41 |
-24:30:47.4 |
HIP 78510 |
16.00 |
| 2026-10-11 00:00 |
16:02:52.20 |
-24:31:50.7 |
HIP 78699 |
18.43 |