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
$$
M_a = (14.986 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.986 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.533 |
| 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) |
| 2026-05-12 00:00 |
06:26:05.07 |
+26:52:29.9 |
HIP 30724 |
20.48 |
| 2026-05-12 12:00 |
06:26:36.42 |
+26:52:01.4 |
HIP 30724 |
15.11 |
| 2026-05-13 00:00 |
06:27:07.85 |
+26:51:32.6 |
HIP 30724 |
11.63 |
| 2026-05-13 12:00 |
06:27:39.33 |
+26:51:03.4 |
HIP 30724 |
11.88 |
| 2026-05-14 00:00 |
06:28:10.89 |
+26:50:34.0 |
HIP 30880 |
12.60 |
| 2026-05-14 12:00 |
06:28:42.51 |
+26:50:04.2 |
HIP 30880 |
8.56 |
| 2026-05-15 00:00 |
06:29:14.19 |
+26:49:34.1 |
HIP 30880 |
9.38 |
| 2026-05-15 12:00 |
06:29:45.93 |
+26:49:03.7 |
HIP 30984 |
9.51 |
| 2026-05-16 00:00 |
06:30:17.73 |
+26:48:32.9 |
HIP 30984 |
8.63 |
| 2026-05-16 12:00 |
06:30:49.60 |
+26:48:01.8 |
HIP 30984 |
12.64 |
| 2026-05-17 00:00 |
06:31:21.52 |
+26:47:30.4 |
HIP 30984 |
18.63 |
| 2026-05-17 12:00 |
06:31:53.50 |
+26:46:58.6 |
HIP 31213 |
12.89 |
| 2026-05-18 00:00 |
06:32:25.54 |
+26:46:26.5 |
HIP 31213 |
5.74 |
| 2026-05-18 12:00 |
06:32:57.63 |
+26:45:54.1 |
HIP 31213 |
1.62 |
| 2026-05-19 00:00 |
06:33:29.78 |
+26:45:21.3 |
HIP 31213 |
8.70 |
| 2026-05-19 12:00 |
06:34:01.98 |
+26:44:48.2 |
HIP 31213 |
15.90 |
| 2026-05-20 00:00 |
06:34:34.23 |
+26:44:14.7 |
HIP 31310 |
20.14 |
| 2026-05-20 12:00 |
06:35:06.54 |
+26:43:40.9 |
HIP 31535 |
13.31 |
| 2026-05-21 00:00 |
06:35:38.89 |
+26:43:06.8 |
HIP 31535 |
6.07 |
| 2026-05-21 12:00 |
06:36:11.30 |
+26:42:32.3 |
HIP 31535 |
1.22 |
| 2026-05-22 00:00 |
06:36:43.75 |
+26:41:57.5 |
HIP 31535 |
8.47 |
| 2026-05-22 12:00 |
06:37:16.25 |
+26:41:22.3 |
HIP 31545 |
14.95 |
| 2026-05-23 00:00 |
06:37:48.80 |
+26:40:46.8 |
HIP 31774 |
15.71 |
| 2026-05-23 12:00 |
06:38:21.39 |
+26:40:10.9 |
HIP 31774 |
10.99 |
| 2026-05-24 00:00 |
06:38:54.03 |
+26:39:34.7 |
HIP 31774 |
10.09 |
| 2026-05-24 12:00 |
06:39:26.71 |
+26:38:58.2 |
HIP 31774 |
13.79 |
| 2026-05-25 00:00 |
06:39:59.43 |
+26:38:21.2 |
HIP 31774 |
19.65 |
| 2026-05-25 12:00 |
06:40:32.20 |
+26:37:44.0 |
HIP 31774 |
26.28 |
| 2026-05-26 00:00 |
06:41:05.00 |
+26:37:06.3 |
HIP 32057 |
21.51 |
| 2026-05-26 12:00 |
06:41:37.85 |
+26:36:28.4 |
HIP 32057 |
18.31 |
| 2026-05-27 00:00 |
06:42:10.73 |
+26:35:50.0 |
HIP 32057 |
17.80 |
| 2026-05-27 12:00 |
06:42:43.66 |
+26:35:11.3 |
HIP 32057 |
20.18 |
| 2026-05-28 00:00 |
06:43:16.62 |
+26:34:32.3 |
HIP 32232 |
21.80 |
| 2026-05-28 12:00 |
06:43:49.62 |
+26:33:52.9 |
HIP 32232 |
20.38 |
| 2026-05-29 00:00 |
06:44:22.66 |
+26:33:13.2 |
HIP 32232 |
21.57 |
| 2026-05-29 12:00 |
06:44:55.73 |
+26:32:33.0 |
HIP 32306 |
24.90 |
| 2026-05-30 00:00 |
06:45:28.84 |
+26:31:52.6 |
HIP 32518 |
22.87 |
| 2026-05-30 12:00 |
06:46:01.98 |
+26:31:11.7 |
HIP 32518 |
15.58 |
| 2026-05-31 00:00 |
06:46:35.15 |
+26:30:30.5 |
HIP 32518 |
8.57 |
| 2026-05-31 12:00 |
06:47:08.36 |
+26:29:49.0 |
HIP 32518 |
3.90 |
| 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 |