284P/McNaught
メタデータ
| 項目 |
値 |
| Designation |
284P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-09-14T05:45:32.915520Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T14:09:44Z |
| Obs used |
1370 |
| NEO |
- |
| M1 |
9.300 |
| K1 |
17.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-07-22.0000000 |
| e |
0.37568432 |
| q (au) |
2.292800 |
| a (au) |
3.672500 |
| i (deg) |
11.859915 |
| Ω (om, deg) |
144.293116 |
| ω (w, deg) |
202.773845 |
| M (ma, deg) |
198.916990 |
等級
散乱 + 全体線形
$$
M_a = (11.012 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.012 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.551 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2020-04-17 |
2021-09-14 |
+3.2889 |
-0.825 |
| 2021-09-14 |
2023-01-18 |
-0.4808 |
-0.114 |
| 2023-01-18 |
2024-02-04 |
+0.3773 |
-0.696 |
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) |
| 2026-02-03 00:00 |
13:25:14.68 |
+01:02:05.5 |
HIP 65483 |
11.11 |
| 2026-02-03 12:00 |
13:25:15.57 |
+01:03:25.2 |
HIP 65483 |
12.43 |
| 2026-02-04 00:00 |
13:25:16.26 |
+01:04:46.2 |
HIP 65483 |
13.78 |
| 2026-02-04 12:00 |
13:25:16.75 |
+01:06:08.4 |
HIP 65483 |
15.15 |
| 2026-02-05 00:00 |
13:25:17.03 |
+01:07:32.0 |
HIP 65483 |
16.54 |
| 2026-02-05 12:00 |
13:25:17.11 |
+01:08:56.8 |
HIP 65483 |
17.96 |
| 2026-02-06 00:00 |
13:25:16.98 |
+01:10:22.8 |
HIP 65483 |
19.39 |
| 2026-02-06 12:00 |
13:25:16.65 |
+01:11:50.2 |
HIP 65405 |
18.96 |
| 2026-02-07 00:00 |
13:25:16.11 |
+01:13:18.8 |
HIP 65405 |
17.94 |
| 2026-02-07 12:00 |
13:25:15.36 |
+01:14:48.6 |
HIP 65405 |
16.94 |
| 2026-02-08 00:00 |
13:25:14.41 |
+01:16:19.7 |
HIP 65405 |
15.95 |
| 2026-02-08 12:00 |
13:25:13.25 |
+01:17:52.1 |
HIP 65405 |
15.01 |
| 2026-02-09 00:00 |
13:25:11.88 |
+01:19:25.7 |
HIP 65405 |
14.12 |
| 2026-02-09 12:00 |
13:25:10.31 |
+01:21:00.5 |
HIP 65405 |
13.31 |
| 2026-02-10 00:00 |
13:25:08.53 |
+01:22:36.5 |
HIP 65405 |
12.60 |
| 2026-02-10 12:00 |
13:25:06.54 |
+01:24:13.8 |
HIP 65405 |
12.03 |
| 2026-02-11 00:00 |
13:25:04.34 |
+01:25:52.3 |
HIP 65405 |
11.64 |
| 2026-02-11 12:00 |
13:25:01.94 |
+01:27:32.0 |
HIP 65405 |
11.44 |
| 2026-02-12 00:00 |
13:24:59.32 |
+01:29:12.9 |
HIP 65405 |
11.49 |
| 2026-02-12 12:00 |
13:24:56.50 |
+01:30:55.0 |
HIP 65405 |
11.78 |
| 2026-02-13 00:00 |
13:24:53.47 |
+01:32:38.3 |
HIP 65405 |
12.32 |
| 2026-02-13 12:00 |
13:24:50.23 |
+01:34:22.8 |
HIP 65405 |
13.09 |
| 2026-02-14 00:00 |
13:24:46.79 |
+01:36:08.4 |
HIP 65405 |
14.07 |
| 2026-02-14 12:00 |
13:24:43.13 |
+01:37:55.2 |
HIP 65405 |
15.24 |
| 2026-02-15 00:00 |
13:24:39.27 |
+01:39:43.2 |
HIP 65405 |
16.58 |
| 2026-02-15 12:00 |
13:24:35.20 |
+01:41:32.3 |
HIP 65405 |
18.05 |
| 2026-02-16 00:00 |
13:24:30.92 |
+01:43:22.5 |
HIP 65405 |
19.64 |
| 2026-02-16 12:00 |
13:24:26.44 |
+01:45:13.8 |
HIP 65405 |
21.34 |
| 2026-02-17 00:00 |
13:24:21.74 |
+01:47:06.3 |
HIP 65405 |
23.14 |
| 2026-02-17 12:00 |
13:24:16.84 |
+01:48:59.8 |
HIP 65405 |
25.02 |
| 2026-02-18 00:00 |
13:24:11.74 |
+01:50:54.5 |
HIP 65405 |
26.97 |
| 2026-02-18 12:00 |
13:24:06.43 |
+01:52:50.2 |
HIP 65405 |
29.01 |
| 2026-02-19 00:00 |
13:24:00.91 |
+01:54:47.0 |
HIP 65405 |
31.11 |
| 2026-02-19 12:00 |
13:23:55.19 |
+01:56:44.8 |
HIP 65405 |
33.27 |
| 2026-02-20 00:00 |
13:23:49.26 |
+01:58:43.7 |
HIP 65198 |
32.53 |
| 2026-02-20 12:00 |
13:23:43.13 |
+02:00:43.6 |
HIP 65198 |
30.68 |
| 2026-02-21 00:00 |
13:23:36.80 |
+02:02:44.5 |
HIP 65198 |
28.87 |
| 2026-02-21 12:00 |
13:23:30.27 |
+02:04:46.4 |
HIP 65198 |
27.13 |
| 2026-02-22 00:00 |
13:23:23.53 |
+02:06:49.3 |
HIP 65198 |
25.49 |
| 2026-02-22 12:00 |
13:23:16.59 |
+02:08:53.1 |
HIP 65198 |
23.99 |
| 2026-02-23 00:00 |
13:23:09.46 |
+02:10:57.9 |
HIP 65198 |
22.66 |
| 2026-02-23 12:00 |
13:23:02.12 |
+02:13:03.7 |
HIP 65198 |
21.56 |
| 2026-02-24 00:00 |
13:22:54.59 |
+02:15:10.4 |
HIP 65198 |
20.75 |