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) |
| 2026-03-26 00:00 |
15:09:04.99 |
-13:20:41.7 |
HIP 74210 |
25.07 |
| 2026-03-26 12:00 |
15:08:58.41 |
-13:19:51.8 |
HIP 74210 |
25.16 |
| 2026-03-27 00:00 |
15:08:51.75 |
-13:19:01.6 |
HIP 74210 |
25.38 |
| 2026-03-27 12:00 |
15:08:45.01 |
-13:18:11.1 |
HIP 74210 |
25.74 |
| 2026-03-28 00:00 |
15:08:38.19 |
-13:17:20.4 |
HIP 74210 |
26.23 |
| 2026-03-28 12:00 |
15:08:31.29 |
-13:16:29.3 |
HIP 74210 |
26.86 |
| 2026-03-29 00:00 |
15:08:24.31 |
-13:15:38.0 |
HIP 74210 |
27.61 |
| 2026-03-29 12:00 |
15:08:17.26 |
-13:14:46.4 |
HIP 74210 |
28.48 |
| 2026-03-30 00:00 |
15:08:10.12 |
-13:13:54.5 |
HIP 74210 |
29.47 |
| 2026-03-30 12:00 |
15:08:02.91 |
-13:13:02.3 |
HIP 73939 |
28.52 |
| 2026-03-31 00:00 |
15:07:55.63 |
-13:12:09.9 |
HIP 73939 |
26.61 |
| 2026-03-31 12:00 |
15:07:48.27 |
-13:11:17.2 |
HIP 73939 |
24.69 |
| 2026-04-01 00:00 |
15:07:40.83 |
-13:10:24.3 |
HIP 73939 |
22.77 |
| 2026-04-01 12:00 |
15:07:33.33 |
-13:09:31.1 |
HIP 73939 |
20.86 |
| 2026-04-02 00:00 |
15:07:25.74 |
-13:08:37.6 |
HIP 73939 |
18.95 |
| 2026-04-02 12:00 |
15:07:18.09 |
-13:07:43.9 |
HIP 73939 |
17.07 |
| 2026-04-03 00:00 |
15:07:10.37 |
-13:06:50.0 |
HIP 73939 |
15.22 |
| 2026-04-03 12:00 |
15:07:02.57 |
-13:05:55.8 |
HIP 73939 |
13.42 |
| 2026-04-04 00:00 |
15:06:54.70 |
-13:05:01.3 |
HIP 73939 |
11.72 |
| 2026-04-04 12:00 |
15:06:46.77 |
-13:04:06.7 |
HIP 73939 |
10.16 |
| 2026-04-05 00:00 |
15:06:38.76 |
-13:03:11.8 |
HIP 73939 |
8.85 |
| 2026-04-05 12:00 |
15:06:30.69 |
-13:02:16.7 |
HIP 73939 |
7.90 |
| 2026-04-06 00:00 |
15:06:22.55 |
-13:01:21.3 |
HIP 73939 |
7.50 |
| 2026-04-06 12:00 |
15:06:14.35 |
-13:00:25.7 |
HIP 73939 |
7.72 |
| 2026-04-07 00:00 |
15:06:06.08 |
-12:59:30.0 |
HIP 73939 |
8.53 |
| 2026-04-07 12:00 |
15:05:57.74 |
-12:58:34.0 |
HIP 73939 |
9.81 |
| 2026-04-08 00:00 |
15:05:49.34 |
-12:57:37.8 |
HIP 73939 |
11.40 |
| 2026-04-08 12:00 |
15:05:40.88 |
-12:56:41.3 |
HIP 73939 |
13.20 |
| 2026-04-09 00:00 |
15:05:32.35 |
-12:55:44.7 |
HIP 73939 |
15.14 |
| 2026-04-09 12:00 |
15:05:23.76 |
-12:54:47.9 |
HIP 73939 |
17.17 |
| 2026-04-10 00:00 |
15:05:15.11 |
-12:53:50.9 |
HIP 73939 |
19.29 |
| 2026-04-10 12:00 |
15:05:06.41 |
-12:52:53.8 |
HIP 73939 |
21.46 |
| 2026-04-11 00:00 |
15:04:57.64 |
-12:51:56.4 |
HIP 73939 |
23.67 |
| 2026-04-11 12:00 |
15:04:48.81 |
-12:50:58.8 |
HIP 73638 |
24.55 |
| 2026-04-12 00:00 |
15:04:39.93 |
-12:50:01.1 |
HIP 73638 |
22.43 |
| 2026-04-12 12:00 |
15:04:30.99 |
-12:49:03.2 |
HIP 73638 |
20.35 |
| 2026-04-13 00:00 |
15:04:22.00 |
-12:48:05.2 |
HIP 73638 |
18.33 |
| 2026-04-13 12:00 |
15:04:12.95 |
-12:47:07.0 |
HIP 73638 |
16.40 |
| 2026-04-14 00:00 |
15:04:03.85 |
-12:46:08.6 |
HIP 73638 |
14.59 |
| 2026-04-14 12:00 |
15:03:54.69 |
-12:45:10.1 |
HIP 73638 |
12.98 |
| 2026-04-15 00:00 |
15:03:45.48 |
-12:44:11.4 |
HIP 73638 |
11.66 |
| 2026-04-15 12:00 |
15:03:36.23 |
-12:43:12.6 |
HIP 73638 |
10.73 |
| 2026-04-16 00:00 |
15:03:26.92 |
-12:42:13.7 |
HIP 73638 |
10.31 |