メタデータ
| 項目 |
値 |
| Designation |
130P/McNaught-Hughes |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-01-21T18:21:27.048960Z |
| Orbit solution date (soln_date, UTC) |
2025-12-29T09:23:47Z |
| Obs used |
2366 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
14.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-03-01.0000000 |
| e |
0.46080056 |
| q (au) |
1.823638 |
| a (au) |
3.382121 |
| i (deg) |
6.065359 |
| Ω (om, deg) |
70.255716 |
| ω (w, deg) |
245.911679 |
| M (ma, deg) |
6.058743 |
等級
散乱 + 全体線形
$$
M_a = (10.080 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.080 |
| n |
6.000 |
| gf |
0.880 |
| gb |
-0.718 |
| k |
0.973 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-03-07 |
2024-10-22 |
+6.2419 |
-2.381 |
| 2024-10-22 |
2025-12-21 |
+6.4393 |
-2.799 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
08:48:21.43 |
+22:02:05.0 |
HIP 43275 |
15.30 |
| 2026-09-20 12:00 |
08:48:44.12 |
+22:01:02.3 |
HIP 43275 |
14.11 |
| 2026-09-21 00:00 |
08:49:06.70 |
+22:00:00.0 |
HIP 43275 |
14.87 |
| 2026-09-21 12:00 |
08:49:29.18 |
+21:58:58.0 |
HIP 43275 |
17.31 |
| 2026-09-22 00:00 |
08:49:51.56 |
+21:57:56.5 |
HIP 43275 |
20.83 |
| 2026-09-22 12:00 |
08:50:13.83 |
+21:56:55.3 |
HIP 43275 |
24.95 |
| 2026-09-23 00:00 |
08:50:36.00 |
+21:55:54.5 |
HIP 43538 |
20.65 |
| 2026-09-23 12:00 |
08:50:58.06 |
+21:54:54.1 |
HIP 43538 |
16.02 |
| 2026-09-24 00:00 |
08:51:20.01 |
+21:53:54.1 |
HIP 43538 |
11.91 |
| 2026-09-24 12:00 |
08:51:41.85 |
+21:52:54.5 |
HIP 43538 |
8.99 |
| 2026-09-25 00:00 |
08:52:03.58 |
+21:51:55.3 |
HIP 43538 |
8.53 |
| 2026-09-25 12:00 |
08:52:25.21 |
+21:50:56.6 |
HIP 43538 |
10.83 |
| 2026-09-26 00:00 |
08:52:46.72 |
+21:49:58.2 |
HIP 43538 |
14.60 |
| 2026-09-26 12:00 |
08:53:08.12 |
+21:49:00.3 |
HIP 43538 |
18.97 |
| 2026-09-27 00:00 |
08:53:29.41 |
+21:48:02.8 |
HIP 43538 |
23.60 |
| 2026-09-27 12:00 |
08:53:50.59 |
+21:47:05.8 |
HIP 43727 |
26.43 |
| 2026-09-28 00:00 |
08:54:11.65 |
+21:46:09.2 |
HIP 43855 |
25.35 |
| 2026-09-28 12:00 |
08:54:32.60 |
+21:45:13.1 |
HIP 43855 |
20.40 |
| 2026-09-29 00:00 |
08:54:53.44 |
+21:44:17.4 |
HIP 43855 |
15.47 |
| 2026-09-29 12:00 |
08:55:14.16 |
+21:43:22.2 |
HIP 43855 |
10.57 |
| 2026-09-30 00:00 |
08:55:34.76 |
+21:42:27.4 |
HIP 43855 |
5.70 |
| 2026-09-30 12:00 |
08:55:55.24 |
+21:41:33.2 |
HIP 43855 |
0.87 |
| 2026-10-01 00:00 |
08:56:15.60 |
+21:40:39.4 |
HIP 43855 |
3.96 |
| 2026-10-01 12:00 |
08:56:35.85 |
+21:39:46.1 |
HIP 43855 |
8.74 |
| 2026-10-02 00:00 |
08:56:55.97 |
+21:38:53.3 |
HIP 43950 |
12.92 |
| 2026-10-02 12:00 |
08:57:15.98 |
+21:38:01.1 |
HIP 43950 |
13.84 |
| 2026-10-03 00:00 |
08:57:35.86 |
+21:37:09.3 |
HIP 43950 |
16.13 |
| 2026-10-03 12:00 |
08:57:55.61 |
+21:36:18.0 |
HIP 43985 |
16.70 |
| 2026-10-04 00:00 |
08:58:15.24 |
+21:35:27.3 |
HIP 43985 |
18.36 |
| 2026-10-04 12:00 |
08:58:34.75 |
+21:34:37.1 |
HIP 43985 |
20.92 |
| 2026-10-05 00:00 |
08:58:54.13 |
+21:33:47.5 |
HIP 44097 |
23.81 |
| 2026-10-05 12:00 |
08:59:13.38 |
+21:32:58.4 |
HIP 44259 |
22.57 |
| 2026-10-06 00:00 |
08:59:32.51 |
+21:32:09.8 |
HIP 44259 |
18.07 |
| 2026-10-06 12:00 |
08:59:51.50 |
+21:31:21.9 |
HIP 44259 |
13.60 |
| 2026-10-07 00:00 |
09:00:10.36 |
+21:30:34.5 |
HIP 44259 |
9.20 |
| 2026-10-07 12:00 |
09:00:29.09 |
+21:29:47.6 |
HIP 44259 |
4.92 |
| 2026-10-08 00:00 |
09:00:47.69 |
+21:29:01.4 |
HIP 44259 |
1.75 |
| 2026-10-08 12:00 |
09:01:06.15 |
+21:28:15.7 |
HIP 44259 |
4.50 |
| 2026-10-09 00:00 |
09:01:24.48 |
+21:27:30.7 |
HIP 44259 |
8.66 |
| 2026-10-09 12:00 |
09:01:42.67 |
+21:26:46.2 |
HIP 44259 |
12.90 |
| 2026-10-10 00:00 |
09:02:00.73 |
+21:26:02.4 |
HIP 44408 |
11.53 |
| 2026-10-10 12:00 |
09:02:18.65 |
+21:25:19.2 |
HIP 44408 |
8.49 |
| 2026-10-11 00:00 |
09:02:36.43 |
+21:24:36.6 |
HIP 44408 |
6.85 |