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) |
| 2026-05-12 00:00 |
19:36:12.69 |
-38:35:51.1 |
HIP 96404 |
11.80 |
| 2026-05-12 12:00 |
19:41:07.51 |
-38:27:28.9 |
HIP 96768 |
22.37 |
| 2026-05-13 00:00 |
19:46:05.99 |
-38:18:08.9 |
HIP 97218 |
12.66 |
| 2026-05-13 12:00 |
19:51:07.96 |
-38:07:49.1 |
HIP 97691 |
9.77 |
| 2026-05-14 00:00 |
19:56:13.23 |
-37:56:27.6 |
HIP 98226 |
18.72 |
| 2026-05-14 12:00 |
20:01:21.59 |
-37:44:02.8 |
HIP 98481 |
11.13 |
| 2026-05-15 00:00 |
20:06:32.83 |
-37:30:33.1 |
HIP 98979 |
16.02 |
| 2026-05-15 12:00 |
20:11:46.71 |
-37:15:56.7 |
HIP 99348 |
27.96 |
| 2026-05-16 00:00 |
20:17:02.98 |
-37:00:12.6 |
HIP 100005 |
22.68 |
| 2026-05-16 12:00 |
20:22:21.38 |
-36:43:19.3 |
HIP 100417 |
10.21 |
| 2026-05-17 00:00 |
20:27:41.63 |
-36:25:16.0 |
HIP 100938 |
4.98 |
| 2026-05-17 12:00 |
20:33:03.45 |
-36:06:01.8 |
HIP 101373 |
8.46 |
| 2026-05-18 00:00 |
20:38:26.55 |
-35:45:36.0 |
HIP 101914 |
22.09 |
| 2026-05-18 12:00 |
20:43:50.62 |
-35:23:58.2 |
HIP 102305 |
14.52 |
| 2026-05-19 00:00 |
20:49:15.37 |
-35:01:08.4 |
HIP 102649 |
21.62 |
| 2026-05-19 12:00 |
20:54:40.47 |
-34:37:06.6 |
HIP 103220 |
15.72 |
| 2026-05-20 00:00 |
21:00:05.62 |
-34:11:53.1 |
HIP 103714 |
11.53 |
| 2026-05-20 12:00 |
21:05:30.50 |
-33:45:28.6 |
HIP 103975 |
34.19 |
| 2026-05-21 00:00 |
21:10:54.82 |
-33:17:53.8 |
HIP 104446 |
19.36 |
| 2026-05-21 12:00 |
21:16:18.25 |
-32:49:10.1 |
HIP 104936 |
16.67 |
| 2026-05-22 00:00 |
21:21:40.51 |
-32:19:18.7 |
HIP 105402 |
20.00 |
| 2026-05-22 12:00 |
21:27:01.29 |
-31:48:21.5 |
HIP 105912 |
7.98 |
| 2026-05-23 00:00 |
21:32:20.32 |
-31:16:20.2 |
HIP 106304 |
17.79 |
| 2026-05-23 12:00 |
21:37:37.31 |
-30:43:17.1 |
HIP 106747 |
3.59 |
| 2026-05-24 00:00 |
21:42:52.02 |
-30:09:14.7 |
HIP 107133 |
28.35 |
| 2026-05-24 12:00 |
21:48:04.18 |
-29:34:15.5 |
HIP 107686 |
16.11 |
| 2026-05-25 00:00 |
21:53:13.57 |
-28:58:22.4 |
HIP 108009 |
13.01 |
| 2026-05-25 12:00 |
21:58:19.97 |
-28:21:38.5 |
HIP 108341 |
20.12 |
| 2026-05-26 00:00 |
22:03:23.16 |
-27:44:06.9 |
HIP 108817 |
23.95 |
| 2026-05-26 12:00 |
22:08:22.98 |
-27:05:51.1 |
HIP 109551 |
41.11 |
| 2026-05-27 00:00 |
22:13:19.23 |
-26:26:54.5 |
HIP 109715 |
5.02 |
| 2026-05-27 12:00 |
22:18:11.78 |
-25:47:20.6 |
HIP 109990 |
22.21 |
| 2026-05-28 00:00 |
22:23:00.48 |
-25:07:13.1 |
HIP 110413 |
20.85 |
| 2026-05-28 12:00 |
22:27:45.21 |
-24:26:35.6 |
HIP 110747 |
21.41 |
| 2026-05-29 00:00 |
22:32:25.86 |
-23:45:32.0 |
HIP 111327 |
19.90 |
| 2026-05-29 12:00 |
22:37:02.35 |
-23:04:05.8 |
HIP 111767 |
27.32 |
| 2026-05-30 00:00 |
22:41:34.60 |
-22:22:20.8 |
HIP 111865 |
37.35 |
| 2026-05-30 12:00 |
22:46:02.56 |
-21:40:20.5 |
HIP 112357 |
18.77 |
| 2026-05-31 00:00 |
22:50:26.17 |
-20:58:08.7 |
HIP 112886 |
17.00 |
| 2026-05-31 12:00 |
22:54:45.41 |
-20:15:48.7 |
HIP 113204 |
12.95 |
| 2026-06-01 00:00 |
22:59:00.25 |
-19:33:24.0 |
HIP 113399 |
22.17 |
| 2026-06-01 12:00 |
23:03:10.70 |
-18:50:57.7 |
HIP 113762 |
13.68 |
| 2026-06-02 00:00 |
23:07:16.74 |
-18:08:33.2 |
HIP 114042 |
26.44 |