メタデータ
| 項目 |
値 |
| Designation |
208P/McMillan |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-07-02T01:58:31.463040Z |
| Orbit solution date (soln_date, UTC) |
2025-10-28T16:12:51Z |
| Obs used |
402 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-08-19.0000000 |
| e |
0.37204667 |
| q (au) |
2.543028 |
| a (au) |
4.049708 |
| i (deg) |
4.409401 |
| Ω (om, deg) |
36.427937 |
| ω (w, deg) |
310.603963 |
| M (ma, deg) |
277.388305 |
等級
散乱 + 全体線形
$$
M_a = (14.985 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.985 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.565 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
06:47:41.60 |
+26:29:07.1 |
HIP 32518 |
8.27 |
| 2026-06-01 12:00 |
06:48:14.87 |
+26:28:24.8 |
HIP 32663 |
13.01 |
| 2026-06-02 00:00 |
06:48:48.17 |
+26:27:42.1 |
HIP 32663 |
9.90 |
| 2026-06-02 12:00 |
06:49:21.50 |
+26:26:59.1 |
HIP 32663 |
11.80 |
| 2026-06-03 00:00 |
06:49:54.86 |
+26:26:15.8 |
HIP 32663 |
17.12 |
| 2026-06-03 12:00 |
06:50:28.25 |
+26:25:32.0 |
HIP 32959 |
19.12 |
| 2026-06-04 00:00 |
06:51:01.67 |
+26:24:47.9 |
HIP 32959 |
11.60 |
| 2026-06-04 12:00 |
06:51:35.11 |
+26:24:03.5 |
HIP 32959 |
4.09 |
| 2026-06-05 00:00 |
06:52:08.59 |
+26:23:18.6 |
HIP 32959 |
3.48 |
| 2026-06-05 12:00 |
06:52:42.08 |
+26:22:33.4 |
HIP 32959 |
11.01 |
| 2026-06-06 00:00 |
06:53:15.61 |
+26:21:47.9 |
HIP 32959 |
18.55 |
| 2026-06-06 12:00 |
06:53:49.16 |
+26:21:01.9 |
HIP 33194 |
14.04 |
| 2026-06-07 00:00 |
06:54:22.73 |
+26:20:15.6 |
HIP 33194 |
11.67 |
| 2026-06-07 12:00 |
06:54:56.32 |
+26:19:29.0 |
HIP 33194 |
13.78 |
| 2026-06-08 00:00 |
06:55:29.94 |
+26:18:41.9 |
HIP 33194 |
18.92 |
| 2026-06-08 12:00 |
06:56:03.58 |
+26:17:54.5 |
HIP 33356 |
20.51 |
| 2026-06-09 00:00 |
06:56:37.24 |
+26:17:06.8 |
HIP 33356 |
20.10 |
| 2026-06-09 12:00 |
06:57:10.93 |
+26:16:18.6 |
HIP 33506 |
20.18 |
| 2026-06-10 00:00 |
06:57:44.63 |
+26:15:30.1 |
HIP 33595 |
17.68 |
| 2026-06-10 12:00 |
06:58:18.35 |
+26:14:41.2 |
HIP 33595 |
11.81 |
| 2026-06-11 00:00 |
06:58:52.10 |
+26:13:52.0 |
HIP 33595 |
9.07 |
| 2026-06-11 12:00 |
06:59:25.85 |
+26:13:02.4 |
HIP 33595 |
11.88 |
| 2026-06-12 00:00 |
06:59:59.63 |
+26:12:12.4 |
HIP 33793 |
14.01 |
| 2026-06-12 12:00 |
07:00:33.43 |
+26:11:22.0 |
HIP 33793 |
6.85 |
| 2026-06-13 00:00 |
07:01:07.23 |
+26:10:31.3 |
HIP 33793 |
3.71 |
| 2026-06-13 12:00 |
07:01:41.06 |
+26:09:40.2 |
HIP 33831 |
8.89 |
| 2026-06-14 00:00 |
07:02:14.90 |
+26:08:48.8 |
HIP 33831 |
14.47 |
| 2026-06-14 12:00 |
07:02:48.75 |
+26:07:57.0 |
HIP 33831 |
21.37 |
| 2026-06-15 00:00 |
07:03:22.61 |
+26:07:04.8 |
HIP 33831 |
28.66 |
| 2026-06-15 12:00 |
07:03:56.49 |
+26:06:12.2 |
HIP 33831 |
36.10 |
| 2026-06-16 00:00 |
07:04:30.38 |
+26:05:19.3 |
HIP 34061 |
40.94 |
| 2026-06-16 12:00 |
07:05:04.28 |
+26:04:26.1 |
HIP 34061 |
42.27 |
| 2026-06-17 00:00 |
07:05:38.18 |
+26:03:32.4 |
HIP 34061 |
44.89 |
| 2026-06-17 12:00 |
07:06:12.10 |
+26:02:38.4 |
HIP 34061 |
48.60 |
| 2026-06-18 00:00 |
07:06:46.02 |
+26:01:44.1 |
HIP 34567 |
42.15 |
| 2026-06-18 12:00 |
07:07:19.95 |
+26:00:49.4 |
HIP 34567 |
34.94 |
| 2026-06-19 00:00 |
07:07:53.88 |
+25:59:54.3 |
HIP 34567 |
27.99 |
| 2026-06-19 12:00 |
07:08:27.82 |
+25:58:58.9 |
HIP 34567 |
21.54 |
| 2026-06-20 00:00 |
07:09:01.76 |
+25:58:03.1 |
HIP 34567 |
16.19 |
| 2026-06-20 12:00 |
07:09:35.71 |
+25:57:07.0 |
HIP 34582 |
13.16 |
| 2026-06-21 00:00 |
07:10:09.66 |
+25:56:10.5 |
HIP 34582 |
13.37 |
| 2026-06-21 12:00 |
07:10:43.61 |
+25:55:13.7 |
HIP 34582 |
17.40 |
| 2026-06-22 00:00 |
07:11:17.57 |
+25:54:16.5 |
HIP 34861 |
22.68 |