メタデータ
| 項目 |
値 |
| Designation |
P/2016 P5 (COIAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-06-01T10:27:54.313920Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
239 |
| 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) |
2022-02-06.0000000 |
| e |
0.05781852 |
| q (au) |
4.432558 |
| a (au) |
4.704569 |
| i (deg) |
7.037249 |
| Ω (om, deg) |
185.406308 |
| ω (w, deg) |
34.972005 |
| M (ma, deg) |
313.595523 |
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 |
-0.543 |
| 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) |
| 2026-05-12 00:00 |
22:48:00.51 |
-03:31:09.8 |
HIP 112669 |
17.00 |
| 2026-05-12 12:00 |
22:48:17.83 |
-03:29:19.8 |
HIP 112669 |
12.33 |
| 2026-05-13 00:00 |
22:48:35.03 |
-03:27:30.5 |
HIP 112669 |
7.71 |
| 2026-05-13 12:00 |
22:48:52.09 |
-03:25:41.9 |
HIP 112669 |
3.27 |
| 2026-05-14 00:00 |
22:49:09.04 |
-03:23:53.9 |
HIP 112669 |
2.15 |
| 2026-05-14 12:00 |
22:49:25.85 |
-03:22:06.6 |
HIP 112669 |
6.35 |
| 2026-05-15 00:00 |
22:49:42.54 |
-03:20:20.0 |
HIP 112669 |
10.82 |
| 2026-05-15 12:00 |
22:49:59.09 |
-03:18:34.1 |
HIP 112669 |
15.28 |
| 2026-05-16 00:00 |
22:50:15.52 |
-03:16:48.9 |
HIP 112866 |
17.05 |
| 2026-05-16 12:00 |
22:50:31.81 |
-03:15:04.4 |
HIP 112866 |
12.80 |
| 2026-05-17 00:00 |
22:50:47.98 |
-03:13:20.7 |
HIP 112866 |
8.76 |
| 2026-05-17 12:00 |
22:51:04.01 |
-03:11:37.6 |
HIP 112866 |
5.34 |
| 2026-05-18 00:00 |
22:51:19.90 |
-03:09:55.3 |
HIP 112866 |
4.25 |
| 2026-05-18 12:00 |
22:51:35.66 |
-03:08:13.7 |
HIP 112866 |
6.67 |
| 2026-05-19 00:00 |
22:51:51.29 |
-03:06:32.9 |
HIP 112866 |
10.34 |
| 2026-05-19 12:00 |
22:52:06.78 |
-03:04:52.8 |
HIP 112866 |
14.30 |
| 2026-05-20 00:00 |
22:52:22.14 |
-03:03:13.5 |
HIP 112866 |
18.34 |
| 2026-05-20 12:00 |
22:52:37.35 |
-03:01:34.9 |
HIP 112866 |
22.39 |
| 2026-05-21 00:00 |
22:52:52.43 |
-02:59:57.1 |
HIP 112967 |
22.61 |
| 2026-05-21 12:00 |
22:53:07.38 |
-02:58:20.1 |
HIP 113101 |
18.73 |
| 2026-05-22 00:00 |
22:53:22.18 |
-02:56:43.8 |
HIP 113101 |
14.70 |
| 2026-05-22 12:00 |
22:53:36.84 |
-02:55:08.4 |
HIP 113101 |
10.72 |
| 2026-05-23 00:00 |
22:53:51.37 |
-02:53:33.7 |
HIP 113101 |
6.77 |
| 2026-05-23 12:00 |
22:54:05.75 |
-02:51:59.9 |
HIP 113101 |
2.89 |
| 2026-05-24 00:00 |
22:54:19.99 |
-02:50:26.8 |
HIP 113101 |
1.21 |
| 2026-05-24 12:00 |
22:54:34.09 |
-02:48:54.6 |
HIP 113101 |
4.93 |
| 2026-05-25 00:00 |
22:54:48.04 |
-02:47:23.1 |
HIP 113101 |
8.72 |
| 2026-05-25 12:00 |
22:55:01.86 |
-02:45:52.5 |
HIP 113101 |
12.48 |
| 2026-05-26 00:00 |
22:55:15.53 |
-02:44:22.7 |
HIP 113101 |
16.20 |
| 2026-05-26 12:00 |
22:55:29.05 |
-02:42:53.8 |
HIP 113101 |
19.89 |
| 2026-05-27 00:00 |
22:55:42.43 |
-02:41:25.7 |
HIP 113101 |
23.53 |
| 2026-05-27 12:00 |
22:55:55.66 |
-02:39:58.4 |
HIP 113101 |
27.14 |
| 2026-05-28 00:00 |
22:56:08.75 |
-02:38:32.0 |
HIP 113101 |
30.72 |
| 2026-05-28 12:00 |
22:56:21.69 |
-02:37:06.4 |
HIP 113421 |
31.43 |
| 2026-05-29 00:00 |
22:56:34.48 |
-02:35:41.7 |
HIP 113421 |
27.94 |
| 2026-05-29 12:00 |
22:56:47.13 |
-02:34:17.9 |
HIP 113421 |
24.49 |
| 2026-05-30 00:00 |
22:56:59.62 |
-02:32:55.0 |
HIP 113421 |
21.08 |
| 2026-05-30 12:00 |
22:57:11.96 |
-02:31:32.9 |
HIP 113421 |
17.70 |
| 2026-05-31 00:00 |
22:57:24.16 |
-02:30:11.7 |
HIP 113421 |
14.38 |
| 2026-05-31 12:00 |
22:57:36.20 |
-02:28:51.4 |
HIP 113421 |
11.09 |
| 2026-06-01 00:00 |
22:57:48.09 |
-02:27:32.0 |
HIP 113421 |
7.85 |
| 2026-06-01 12:00 |
22:57:59.83 |
-02:26:13.5 |
HIP 113421 |
4.66 |
| 2026-06-02 00:00 |
22:58:11.42 |
-02:24:56.0 |
HIP 113421 |
1.59 |