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) |
| 2026-03-26 00:00 |
06:13:25.97 |
+27:00:53.3 |
HIP 29510 |
25.65 |
| 2026-03-26 12:00 |
06:13:38.54 |
+27:00:38.5 |
HIP 29510 |
26.64 |
| 2026-03-27 00:00 |
06:13:51.31 |
+27:00:23.6 |
HIP 29510 |
27.90 |
| 2026-03-27 12:00 |
06:14:04.28 |
+27:00:08.6 |
HIP 29510 |
29.40 |
| 2026-03-28 00:00 |
06:14:17.46 |
+26:59:53.5 |
HIP 29510 |
31.13 |
| 2026-03-28 12:00 |
06:14:30.83 |
+26:59:38.4 |
HIP 29510 |
33.06 |
| 2026-03-29 00:00 |
06:14:44.41 |
+26:59:23.1 |
HIP 29510 |
35.16 |
| 2026-03-29 12:00 |
06:14:58.18 |
+26:59:07.8 |
HIP 29866 |
36.49 |
| 2026-03-30 00:00 |
06:15:12.15 |
+26:58:52.4 |
HIP 29866 |
33.97 |
| 2026-03-30 12:00 |
06:15:26.32 |
+26:58:36.9 |
HIP 29866 |
31.54 |
| 2026-03-31 00:00 |
06:15:40.68 |
+26:58:21.3 |
HIP 29866 |
29.21 |
| 2026-03-31 12:00 |
06:15:55.23 |
+26:58:05.5 |
HIP 29866 |
27.03 |
| 2026-04-01 00:00 |
06:16:09.97 |
+26:57:49.7 |
HIP 29866 |
25.05 |
| 2026-04-01 12:00 |
06:16:24.90 |
+26:57:33.8 |
HIP 29866 |
23.36 |
| 2026-04-02 00:00 |
06:16:40.01 |
+26:57:17.8 |
HIP 29866 |
22.02 |
| 2026-04-02 12:00 |
06:16:55.31 |
+26:57:01.7 |
HIP 29866 |
21.14 |
| 2026-04-03 00:00 |
06:17:10.80 |
+26:56:45.5 |
HIP 29866 |
20.78 |
| 2026-04-03 12:00 |
06:17:26.47 |
+26:56:29.2 |
HIP 29955 |
20.16 |
| 2026-04-04 00:00 |
06:17:42.32 |
+26:56:12.8 |
HIP 29955 |
18.51 |
| 2026-04-04 12:00 |
06:17:58.35 |
+26:55:56.2 |
HIP 29955 |
17.41 |
| 2026-04-05 00:00 |
06:18:14.57 |
+26:55:39.6 |
HIP 29955 |
17.02 |
| 2026-04-05 12:00 |
06:18:30.95 |
+26:55:22.8 |
HIP 29955 |
17.39 |
| 2026-04-06 00:00 |
06:18:47.52 |
+26:55:05.9 |
HIP 29955 |
18.50 |
| 2026-04-06 12:00 |
06:19:04.26 |
+26:54:48.9 |
HIP 29955 |
20.26 |
| 2026-04-07 00:00 |
06:19:21.17 |
+26:54:31.8 |
HIP 29955 |
22.54 |
| 2026-04-07 12:00 |
06:19:38.26 |
+26:54:14.5 |
HIP 29955 |
25.20 |
| 2026-04-08 00:00 |
06:19:55.52 |
+26:53:57.1 |
HIP 29955 |
28.17 |
| 2026-04-08 12:00 |
06:20:12.95 |
+26:53:39.6 |
HIP 30101 |
29.50 |
| 2026-04-09 00:00 |
06:20:30.54 |
+26:53:22.0 |
HIP 30305 |
27.10 |
| 2026-04-09 12:00 |
06:20:48.31 |
+26:53:04.2 |
HIP 30305 |
23.26 |
| 2026-04-10 00:00 |
06:21:06.24 |
+26:52:46.3 |
HIP 30305 |
19.45 |
| 2026-04-10 12:00 |
06:21:24.33 |
+26:52:28.2 |
HIP 30305 |
15.70 |
| 2026-04-11 00:00 |
06:21:42.59 |
+26:52:10.0 |
HIP 30305 |
12.11 |
| 2026-04-11 12:00 |
06:22:01.02 |
+26:51:51.7 |
HIP 30305 |
8.94 |
| 2026-04-12 00:00 |
06:22:19.60 |
+26:51:33.2 |
HIP 30305 |
6.84 |
| 2026-04-12 12:00 |
06:22:38.34 |
+26:51:14.6 |
HIP 30305 |
6.97 |
| 2026-04-13 00:00 |
06:22:57.24 |
+26:50:55.8 |
HIP 30305 |
9.27 |
| 2026-04-13 12:00 |
06:23:16.30 |
+26:50:36.9 |
HIP 30305 |
12.64 |
| 2026-04-14 00:00 |
06:23:35.51 |
+26:50:17.8 |
HIP 30305 |
16.47 |
| 2026-04-14 12:00 |
06:23:54.88 |
+26:49:58.6 |
HIP 30396 |
17.97 |
| 2026-04-15 00:00 |
06:24:14.41 |
+26:49:39.2 |
HIP 30396 |
20.02 |
| 2026-04-15 12:00 |
06:24:34.08 |
+26:49:19.6 |
HIP 30396 |
22.76 |
| 2026-04-16 00:00 |
06:24:53.91 |
+26:49:00.0 |
HIP 30396 |
25.98 |