メタデータ
| 項目 |
値 |
| Designation |
320P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-02-21T01:58:51.620160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:23Z |
| Obs used |
121 |
| NEO |
Yes |
| M1 |
19.600 |
| K1 |
14.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-04-07.0000000 |
| e |
0.68244389 |
| q (au) |
0.985360 |
| a (au) |
3.102949 |
| i (deg) |
4.893564 |
| Ω (om, deg) |
295.955979 |
| ω (w, deg) |
0.665974 |
| M (ma, deg) |
73.916022 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 5.332\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
5.332 |
| gf |
1.000 |
| gb |
-0.745 |
| k |
0.981 |
| 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) |
| 2026-03-26 00:00 |
15:50:35.71 |
-29:59:41.4 |
HIP 77641 |
8.41 |
| 2026-03-26 12:00 |
15:51:44.67 |
-30:06:37.1 |
HIP 77641 |
8.66 |
| 2026-03-27 00:00 |
15:52:54.20 |
-30:13:34.4 |
HIP 77729 |
22.27 |
| 2026-03-27 12:00 |
15:54:04.32 |
-30:20:33.3 |
HIP 77896 |
6.98 |
| 2026-03-28 00:00 |
15:55:15.05 |
-30:27:33.9 |
HIP 77896 |
10.54 |
| 2026-03-28 12:00 |
15:56:26.39 |
-30:34:36.2 |
HIP 78112 |
23.52 |
| 2026-03-29 00:00 |
15:57:38.38 |
-30:41:40.1 |
HIP 78112 |
17.39 |
| 2026-03-29 12:00 |
15:58:51.03 |
-30:48:45.6 |
HIP 78303 |
20.22 |
| 2026-03-30 00:00 |
16:00:04.36 |
-30:55:52.9 |
HIP 78352 |
14.43 |
| 2026-03-30 12:00 |
16:01:18.38 |
-31:03:01.9 |
HIP 78352 |
19.63 |
| 2026-03-31 00:00 |
16:02:33.12 |
-31:10:12.5 |
HIP 78601 |
14.13 |
| 2026-03-31 12:00 |
16:03:48.59 |
-31:17:24.9 |
HIP 78817 |
22.66 |
| 2026-04-01 00:00 |
16:05:04.81 |
-31:24:38.9 |
HIP 78817 |
4.91 |
| 2026-04-01 12:00 |
16:06:21.82 |
-31:31:54.7 |
HIP 78910 |
11.44 |
| 2026-04-02 00:00 |
16:07:39.62 |
-31:39:12.1 |
HIP 78998 |
6.16 |
| 2026-04-02 12:00 |
16:08:58.24 |
-31:46:31.3 |
HIP 79078 |
10.23 |
| 2026-04-03 00:00 |
16:10:17.70 |
-31:53:52.1 |
HIP 79198 |
18.46 |
| 2026-04-03 12:00 |
16:11:38.03 |
-32:01:14.6 |
HIP 79355 |
14.48 |
| 2026-04-04 00:00 |
16:12:59.25 |
-32:08:38.8 |
HIP 79496 |
4.97 |
| 2026-04-04 12:00 |
16:14:21.38 |
-32:16:04.7 |
HIP 79630 |
13.06 |
| 2026-04-05 00:00 |
16:15:44.46 |
-32:23:32.2 |
HIP 79630 |
10.50 |
| 2026-04-05 12:00 |
16:17:08.50 |
-32:31:01.3 |
HIP 79738 |
9.90 |
| 2026-04-06 00:00 |
16:18:33.53 |
-32:38:32.0 |
HIP 79883 |
19.26 |
| 2026-04-06 12:00 |
16:19:59.59 |
-32:46:04.3 |
HIP 80080 |
21.98 |
| 2026-04-07 00:00 |
16:21:26.69 |
-32:53:38.1 |
HIP 80080 |
16.39 |
| 2026-04-07 12:00 |
16:22:54.88 |
-33:01:13.5 |
HIP 80324 |
16.82 |
| 2026-04-08 00:00 |
16:24:24.18 |
-33:08:50.3 |
HIP 80324 |
6.54 |
| 2026-04-08 12:00 |
16:25:54.62 |
-33:16:28.5 |
HIP 80552 |
16.26 |
| 2026-04-09 00:00 |
16:27:26.23 |
-33:24:08.2 |
HIP 80552 |
21.42 |
| 2026-04-09 12:00 |
16:28:59.05 |
-33:31:49.2 |
HIP 80770 |
13.92 |
| 2026-04-10 00:00 |
16:30:33.12 |
-33:39:31.4 |
HIP 80875 |
19.70 |
| 2026-04-10 12:00 |
16:32:08.47 |
-33:47:14.9 |
HIP 80987 |
27.22 |
| 2026-04-11 00:00 |
16:33:45.13 |
-33:54:59.5 |
HIP 81194 |
22.96 |
| 2026-04-11 12:00 |
16:35:23.14 |
-34:02:45.2 |
HIP 81200 |
21.74 |
| 2026-04-12 00:00 |
16:37:02.55 |
-34:10:31.9 |
HIP 81447 |
16.05 |
| 2026-04-12 12:00 |
16:38:43.39 |
-34:18:19.5 |
HIP 81504 |
3.01 |
| 2026-04-13 00:00 |
16:40:25.71 |
-34:26:07.9 |
HIP 81504 |
20.34 |
| 2026-04-13 12:00 |
16:42:09.54 |
-34:33:57.0 |
HIP 81772 |
6.25 |
| 2026-04-14 00:00 |
16:43:54.94 |
-34:41:46.7 |
HIP 82033 |
19.67 |
| 2026-04-14 12:00 |
16:45:41.95 |
-34:49:36.9 |
HIP 82033 |
13.12 |
| 2026-04-15 00:00 |
16:47:30.61 |
-34:57:27.3 |
HIP 82300 |
18.71 |
| 2026-04-15 12:00 |
16:49:20.98 |
-35:05:18.0 |
HIP 82362 |
13.63 |
| 2026-04-16 00:00 |
16:51:13.10 |
-35:13:08.6 |
HIP 82362 |
18.30 |