メタデータ
| 項目 |
値 |
| Designation |
262P/McNaught-Russell |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-12-04T11:01:48.411840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:09Z |
| Obs used |
1339 |
| NEO |
Yes |
| M1 |
14.700 |
| K1 |
6.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-12-24.0000000 |
| e |
0.81540093 |
| q (au) |
1.280260 |
| a (au) |
6.935353 |
| i (deg) |
29.079418 |
| Ω (om, deg) |
218.014306 |
| ω (w, deg) |
171.169762 |
| M (ma, deg) |
341.303779 |
等級
散乱 + 全体線形
$$
M_a = (14.572 + 3.736\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.572 |
| n |
3.736 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2012-05-29 |
2012-09-20 |
-8.5325 |
+2.913 |
| 2012-09-20 |
2012-12-04 |
+11.6281 |
-1.021 |
| 2012-12-05 |
2013-04-22 |
-6.0909 |
-0.588 |
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) |
| 2026-05-12 00:00 |
14:54:41.53 |
-11:50:10.6 |
HIP 72934 |
5.88 |
| 2026-05-12 12:00 |
14:54:31.14 |
-11:49:11.9 |
HIP 72934 |
5.12 |
| 2026-05-13 00:00 |
14:54:20.77 |
-11:48:13.3 |
HIP 72934 |
5.70 |
| 2026-05-13 12:00 |
14:54:10.40 |
-11:47:14.8 |
HIP 72919 |
6.93 |
| 2026-05-14 00:00 |
14:54:00.05 |
-11:46:16.5 |
HIP 72919 |
6.45 |
| 2026-05-14 12:00 |
14:53:49.71 |
-11:45:18.4 |
HIP 72919 |
7.07 |
| 2026-05-15 00:00 |
14:53:39.39 |
-11:44:20.5 |
HIP 72919 |
8.54 |
| 2026-05-15 12:00 |
14:53:29.08 |
-11:43:22.7 |
HIP 72919 |
10.51 |
| 2026-05-16 00:00 |
14:53:18.78 |
-11:42:25.1 |
HIP 72919 |
12.75 |
| 2026-05-16 12:00 |
14:53:08.51 |
-11:41:27.7 |
HIP 72919 |
15.14 |
| 2026-05-17 00:00 |
14:52:58.25 |
-11:40:30.4 |
HIP 72750 |
15.17 |
| 2026-05-17 12:00 |
14:52:48.01 |
-11:39:33.4 |
HIP 72750 |
12.98 |
| 2026-05-18 00:00 |
14:52:37.79 |
-11:38:36.6 |
HIP 72750 |
11.02 |
| 2026-05-18 12:00 |
14:52:27.60 |
-11:37:39.9 |
HIP 72750 |
9.42 |
| 2026-05-19 00:00 |
14:52:17.43 |
-11:36:43.5 |
HIP 72750 |
8.39 |
| 2026-05-19 12:00 |
14:52:07.28 |
-11:35:47.3 |
HIP 72750 |
8.14 |
| 2026-05-20 00:00 |
14:51:57.16 |
-11:34:51.3 |
HIP 72750 |
8.73 |
| 2026-05-20 12:00 |
14:51:47.06 |
-11:33:55.6 |
HIP 72750 |
10.01 |
| 2026-05-21 00:00 |
14:51:36.99 |
-11:33:00.1 |
HIP 72750 |
11.75 |
| 2026-05-21 12:00 |
14:51:26.96 |
-11:32:04.8 |
HIP 72750 |
13.76 |
| 2026-05-22 00:00 |
14:51:16.95 |
-11:31:09.7 |
HIP 72750 |
15.95 |
| 2026-05-22 12:00 |
14:51:06.97 |
-11:30:14.9 |
HIP 72750 |
18.25 |
| 2026-05-23 00:00 |
14:50:57.02 |
-11:29:20.4 |
HIP 72750 |
20.61 |
| 2026-05-23 12:00 |
14:50:47.11 |
-11:28:26.1 |
HIP 72750 |
23.02 |
| 2026-05-24 00:00 |
14:50:37.23 |
-11:27:32.1 |
HIP 72750 |
25.46 |
| 2026-05-24 12:00 |
14:50:27.39 |
-11:26:38.3 |
HIP 72750 |
27.91 |
| 2026-05-25 00:00 |
14:50:17.58 |
-11:25:44.8 |
HIP 72750 |
30.37 |
| 2026-05-25 12:00 |
14:50:07.81 |
-11:24:51.6 |
HIP 72750 |
32.84 |
| 2026-05-26 00:00 |
14:49:58.08 |
-11:23:58.6 |
HIP 72750 |
35.31 |
| 2026-05-26 12:00 |
14:49:48.38 |
-11:23:05.9 |
HIP 72478 |
34.71 |
| 2026-05-27 00:00 |
14:49:38.73 |
-11:22:13.5 |
HIP 72478 |
33.30 |
| 2026-05-27 12:00 |
14:49:29.12 |
-11:21:21.4 |
HIP 72478 |
32.04 |
| 2026-05-28 00:00 |
14:49:19.55 |
-11:20:29.6 |
HIP 72478 |
30.93 |
| 2026-05-28 12:00 |
14:49:10.02 |
-11:19:38.1 |
HIP 72478 |
30.00 |
| 2026-05-29 00:00 |
14:49:00.53 |
-11:18:46.9 |
HIP 72299 |
28.37 |
| 2026-05-29 12:00 |
14:48:51.09 |
-11:17:56.0 |
HIP 72299 |
26.20 |
| 2026-05-30 00:00 |
14:48:41.69 |
-11:17:05.4 |
HIP 72299 |
24.09 |
| 2026-05-30 12:00 |
14:48:32.34 |
-11:16:15.1 |
HIP 72299 |
22.07 |
| 2026-05-31 00:00 |
14:48:23.04 |
-11:15:25.2 |
HIP 72299 |
20.14 |
| 2026-05-31 12:00 |
14:48:13.78 |
-11:14:35.5 |
HIP 72299 |
18.34 |
| 2026-06-01 00:00 |
14:48:04.58 |
-11:13:46.2 |
HIP 72299 |
16.71 |
| 2026-06-01 12:00 |
14:47:55.42 |
-11:12:57.2 |
HIP 72299 |
15.29 |
| 2026-06-02 00:00 |
14:47:46.32 |
-11:12:08.5 |
HIP 72299 |
14.13 |