メタデータ
| 項目 |
値 |
| Designation |
442P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-08-20T19:07:02.740800Z |
| Orbit solution date (soln_date, UTC) |
2024-07-07T00:42:22Z |
| Obs used |
452 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
19.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-08-20.0000000 |
| e |
0.53159899 |
| q (au) |
2.328281 |
| a (au) |
4.970701 |
| i (deg) |
6.053247 |
| Ω (om, deg) |
32.033725 |
| ω (w, deg) |
310.972640 |
| M (ma, deg) |
229.993643 |
等級
散乱 + 全体線形
$$
M_a = (15.717 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.717 |
| n |
2.000 |
| gf |
0.983 |
| gb |
-0.900 |
| k |
0.999 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
09:06:06.46 |
+23:17:34.9 |
HIP 44740 |
13.09 |
| 2026-03-26 12:00 |
09:05:59.40 |
+23:17:36.5 |
HIP 44740 |
14.69 |
| 2026-03-27 00:00 |
09:05:52.49 |
+23:17:37.5 |
HIP 44740 |
16.26 |
| 2026-03-27 12:00 |
09:05:45.73 |
+23:17:37.7 |
HIP 44740 |
17.80 |
| 2026-03-28 00:00 |
09:05:39.11 |
+23:17:37.1 |
HIP 44740 |
19.31 |
| 2026-03-28 12:00 |
09:05:32.65 |
+23:17:35.8 |
HIP 44740 |
20.79 |
| 2026-03-29 00:00 |
09:05:26.34 |
+23:17:33.8 |
HIP 44740 |
22.23 |
| 2026-03-29 12:00 |
09:05:20.18 |
+23:17:31.1 |
HIP 44740 |
23.65 |
| 2026-03-30 00:00 |
09:05:14.17 |
+23:17:27.6 |
HIP 44740 |
25.03 |
| 2026-03-30 12:00 |
09:05:08.32 |
+23:17:23.4 |
HIP 44740 |
26.37 |
| 2026-03-31 00:00 |
09:05:02.61 |
+23:17:18.5 |
HIP 44586 |
27.39 |
| 2026-03-31 12:00 |
09:04:57.06 |
+23:17:12.8 |
HIP 44586 |
27.30 |
| 2026-04-01 00:00 |
09:04:51.66 |
+23:17:06.5 |
HIP 44586 |
27.25 |
| 2026-04-01 12:00 |
09:04:46.41 |
+23:16:59.4 |
HIP 44586 |
27.25 |
| 2026-04-02 00:00 |
09:04:41.32 |
+23:16:51.6 |
HIP 44586 |
27.28 |
| 2026-04-02 12:00 |
09:04:36.38 |
+23:16:43.1 |
HIP 44586 |
27.34 |
| 2026-04-03 00:00 |
09:04:31.59 |
+23:16:33.9 |
HIP 44586 |
27.43 |
| 2026-04-03 12:00 |
09:04:26.96 |
+23:16:24.0 |
HIP 44586 |
27.55 |
| 2026-04-04 00:00 |
09:04:22.48 |
+23:16:13.4 |
HIP 44586 |
27.68 |
| 2026-04-04 12:00 |
09:04:18.15 |
+23:16:02.1 |
HIP 44586 |
27.83 |
| 2026-04-05 00:00 |
09:04:13.98 |
+23:15:50.1 |
HIP 44586 |
27.99 |
| 2026-04-05 12:00 |
09:04:09.96 |
+23:15:37.4 |
HIP 44586 |
28.16 |
| 2026-04-06 00:00 |
09:04:06.09 |
+23:15:24.1 |
HIP 44586 |
28.34 |
| 2026-04-06 12:00 |
09:04:02.38 |
+23:15:10.0 |
HIP 44586 |
28.52 |
| 2026-04-07 00:00 |
09:03:58.83 |
+23:14:55.3 |
HIP 44586 |
28.69 |
| 2026-04-07 12:00 |
09:03:55.43 |
+23:14:39.9 |
HIP 44586 |
28.86 |
| 2026-04-08 00:00 |
09:03:52.18 |
+23:14:23.8 |
HIP 44586 |
29.03 |
| 2026-04-08 12:00 |
09:03:49.09 |
+23:14:07.0 |
HIP 44586 |
29.19 |
| 2026-04-09 00:00 |
09:03:46.15 |
+23:13:49.6 |
HIP 44586 |
29.33 |
| 2026-04-09 12:00 |
09:03:43.37 |
+23:13:31.5 |
HIP 44586 |
29.47 |
| 2026-04-10 00:00 |
09:03:40.74 |
+23:13:12.7 |
HIP 44586 |
29.59 |
| 2026-04-10 12:00 |
09:03:38.26 |
+23:12:53.3 |
HIP 44586 |
29.69 |
| 2026-04-11 00:00 |
09:03:35.95 |
+23:12:33.2 |
HIP 44586 |
29.78 |
| 2026-04-11 12:00 |
09:03:33.78 |
+23:12:12.5 |
HIP 44586 |
29.84 |
| 2026-04-12 00:00 |
09:03:31.77 |
+23:11:51.1 |
HIP 44586 |
29.89 |
| 2026-04-12 12:00 |
09:03:29.92 |
+23:11:29.1 |
HIP 44586 |
29.92 |
| 2026-04-13 00:00 |
09:03:28.22 |
+23:11:06.4 |
HIP 44586 |
29.92 |
| 2026-04-13 12:00 |
09:03:26.67 |
+23:10:43.0 |
HIP 44586 |
29.90 |
| 2026-04-14 00:00 |
09:03:25.28 |
+23:10:19.1 |
HIP 44586 |
29.86 |
| 2026-04-14 12:00 |
09:03:24.04 |
+23:09:54.5 |
HIP 44586 |
29.79 |
| 2026-04-15 00:00 |
09:03:22.96 |
+23:09:29.2 |
HIP 44586 |
29.70 |
| 2026-04-15 12:00 |
09:03:22.03 |
+23:09:03.3 |
HIP 44586 |
29.58 |
| 2026-04-16 00:00 |
09:03:21.26 |
+23:08:36.8 |
HIP 44586 |
29.43 |