メタデータ
| 項目 |
値 |
| Designation |
P/2016 P5 (COIAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-06-01T05:52:40.586880Z |
| Orbit solution date (soln_date, UTC) |
2026-09-04T08:42:14Z |
| Obs used |
258 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
16.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2016-08-01T11:41:07.296000Z |
| Discovery magnitude (MPC) |
24.10 z |
| Discovery observatory (MPC) |
T09 · Subaru Telescope, Maunakea |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-06-14.0000000 |
| e |
0.05766890 |
| q (au) |
4.432804 |
| a (au) |
4.704083 |
| i (deg) |
7.037902 |
| Ω (om, deg) |
185.405426 |
| ω (w, deg) |
34.947211 |
| M (ma, deg) |
325.972009 |
等級
散乱 + 全体線形
$$
M_a = (14.138 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.138 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.703 |
| 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 |
22:37:36.28 |
-05:00:15.8 |
HIP 111581 |
21.49 |
| 2026-09-20 12:00 |
22:37:22.92 |
-05:02:09.6 |
HIP 111581 |
17.68 |
| 2026-09-21 00:00 |
22:37:09.66 |
-05:04:03.1 |
HIP 111581 |
13.90 |
| 2026-09-21 12:00 |
22:36:56.49 |
-05:05:56.1 |
HIP 111581 |
10.16 |
| 2026-09-22 00:00 |
22:36:43.43 |
-05:07:48.7 |
HIP 111581 |
6.51 |
| 2026-09-22 12:00 |
22:36:30.48 |
-05:09:40.7 |
HIP 111581 |
3.15 |
| 2026-09-23 00:00 |
22:36:17.64 |
-05:11:32.3 |
HIP 111581 |
2.26 |
| 2026-09-23 12:00 |
22:36:04.90 |
-05:13:23.3 |
HIP 111581 |
5.24 |
| 2026-09-24 00:00 |
22:35:52.28 |
-05:15:13.8 |
HIP 111581 |
8.73 |
| 2026-09-24 12:00 |
22:35:39.77 |
-05:17:03.8 |
HIP 111581 |
12.29 |
| 2026-09-25 00:00 |
22:35:27.38 |
-05:18:53.2 |
HIP 111581 |
15.84 |
| 2026-09-25 12:00 |
22:35:15.11 |
-05:20:42.1 |
HIP 111581 |
19.37 |
| 2026-09-26 00:00 |
22:35:02.96 |
-05:22:30.3 |
HIP 111581 |
22.88 |
| 2026-09-26 12:00 |
22:34:50.93 |
-05:24:18.0 |
HIP 111581 |
26.36 |
| 2026-09-27 00:00 |
22:34:39.03 |
-05:26:05.0 |
HIP 111581 |
29.81 |
| 2026-09-27 12:00 |
22:34:27.26 |
-05:27:51.4 |
HIP 111281 |
32.59 |
| 2026-09-28 00:00 |
22:34:15.61 |
-05:29:37.1 |
HIP 111281 |
31.24 |
| 2026-09-28 12:00 |
22:34:04.10 |
-05:31:22.2 |
HIP 111281 |
30.22 |
| 2026-09-29 00:00 |
22:33:52.71 |
-05:33:06.6 |
HIP 111281 |
29.57 |
| 2026-09-29 12:00 |
22:33:41.47 |
-05:34:50.3 |
HIP 111281 |
29.29 |
| 2026-09-30 00:00 |
22:33:30.36 |
-05:36:33.3 |
HIP 111281 |
29.38 |
| 2026-09-30 12:00 |
22:33:19.39 |
-05:38:15.6 |
HIP 111281 |
29.83 |
| 2026-10-01 00:00 |
22:33:08.56 |
-05:39:57.2 |
HIP 111281 |
30.61 |
| 2026-10-01 12:00 |
22:32:57.87 |
-05:41:38.0 |
HIP 111281 |
31.69 |
| 2026-10-02 00:00 |
22:32:47.32 |
-05:43:18.1 |
HIP 111281 |
33.02 |
| 2026-10-02 12:00 |
22:32:36.93 |
-05:44:57.4 |
HIP 111281 |
34.57 |
| 2026-10-03 00:00 |
22:32:26.68 |
-05:46:35.9 |
HIP 111281 |
36.30 |
| 2026-10-03 12:00 |
22:32:16.58 |
-05:48:13.7 |
HIP 111281 |
38.17 |
| 2026-10-04 00:00 |
22:32:06.63 |
-05:49:50.6 |
HIP 111274 |
38.79 |
| 2026-10-04 12:00 |
22:31:56.84 |
-05:51:26.7 |
HIP 111274 |
37.73 |
| 2026-10-05 00:00 |
22:31:47.20 |
-05:53:01.9 |
HIP 111274 |
36.88 |
| 2026-10-05 12:00 |
22:31:37.71 |
-05:54:36.3 |
HIP 111274 |
36.23 |
| 2026-10-06 00:00 |
22:31:28.39 |
-05:56:09.9 |
HIP 111274 |
35.79 |
| 2026-10-06 12:00 |
22:31:19.23 |
-05:57:42.6 |
HIP 111274 |
35.55 |
| 2026-10-07 00:00 |
22:31:10.23 |
-05:59:14.3 |
HIP 111170 |
34.11 |
| 2026-10-07 12:00 |
22:31:01.39 |
-06:00:45.2 |
HIP 111170 |
32.81 |
| 2026-10-08 00:00 |
22:30:52.72 |
-06:02:15.2 |
HIP 111170 |
31.68 |
| 2026-10-08 12:00 |
22:30:44.22 |
-06:03:44.3 |
HIP 111170 |
30.74 |
| 2026-10-09 00:00 |
22:30:35.88 |
-06:05:12.4 |
HIP 111170 |
29.99 |
| 2026-10-09 12:00 |
22:30:27.72 |
-06:06:39.5 |
HIP 111170 |
29.44 |
| 2026-10-10 00:00 |
22:30:19.72 |
-06:08:05.7 |
HIP 111170 |
29.09 |
| 2026-10-10 12:00 |
22:30:11.90 |
-06:09:31.0 |
HIP 111170 |
28.93 |
| 2026-10-11 00:00 |
22:30:04.26 |
-06:10:55.2 |
HIP 111170 |
28.95 |