262P/McNaught-Russell
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) |
| 2026-02-03 00:00 |
15:12:05.80 |
-14:13:05.8 |
HIP 74531 |
27.21 |
| 2026-02-03 12:00 |
15:12:08.89 |
-14:12:55.7 |
HIP 74531 |
26.47 |
| 2026-02-04 00:00 |
15:12:11.88 |
-14:12:45.2 |
HIP 74531 |
25.74 |
| 2026-02-04 12:00 |
15:12:14.78 |
-14:12:34.2 |
HIP 74531 |
25.03 |
| 2026-02-05 00:00 |
15:12:17.59 |
-14:12:22.9 |
HIP 74531 |
24.34 |
| 2026-02-05 12:00 |
15:12:20.30 |
-14:12:11.1 |
HIP 74531 |
23.66 |
| 2026-02-06 00:00 |
15:12:22.93 |
-14:11:58.9 |
HIP 74531 |
23.00 |
| 2026-02-06 12:00 |
15:12:25.46 |
-14:11:46.3 |
HIP 74531 |
22.36 |
| 2026-02-07 00:00 |
15:12:27.90 |
-14:11:33.2 |
HIP 74531 |
21.74 |
| 2026-02-07 12:00 |
15:12:30.24 |
-14:11:19.8 |
HIP 74531 |
21.13 |
| 2026-02-08 00:00 |
15:12:32.49 |
-14:11:05.9 |
HIP 74531 |
20.54 |
| 2026-02-08 12:00 |
15:12:34.65 |
-14:10:51.6 |
HIP 74531 |
19.96 |
| 2026-02-09 00:00 |
15:12:36.71 |
-14:10:36.8 |
HIP 74531 |
19.41 |
| 2026-02-09 12:00 |
15:12:38.68 |
-14:10:21.7 |
HIP 74531 |
18.87 |
| 2026-02-10 00:00 |
15:12:40.55 |
-14:10:06.1 |
HIP 74531 |
18.34 |
| 2026-02-10 12:00 |
15:12:42.33 |
-14:09:50.1 |
HIP 74531 |
17.84 |
| 2026-02-11 00:00 |
15:12:44.02 |
-14:09:33.6 |
HIP 74531 |
17.35 |
| 2026-02-11 12:00 |
15:12:45.60 |
-14:09:16.8 |
HIP 74531 |
16.88 |
| 2026-02-12 00:00 |
15:12:47.09 |
-14:08:59.5 |
HIP 74531 |
16.42 |
| 2026-02-12 12:00 |
15:12:48.49 |
-14:08:41.8 |
HIP 74531 |
15.99 |
| 2026-02-13 00:00 |
15:12:49.79 |
-14:08:23.6 |
HIP 74531 |
15.57 |
| 2026-02-13 12:00 |
15:12:50.99 |
-14:08:05.1 |
HIP 74531 |
15.17 |
| 2026-02-14 00:00 |
15:12:52.09 |
-14:07:46.1 |
HIP 74531 |
14.79 |
| 2026-02-14 12:00 |
15:12:53.10 |
-14:07:26.7 |
HIP 74531 |
14.43 |
| 2026-02-15 00:00 |
15:12:54.01 |
-14:07:06.8 |
HIP 74531 |
14.10 |
| 2026-02-15 12:00 |
15:12:54.82 |
-14:06:46.6 |
HIP 74531 |
13.78 |
| 2026-02-16 00:00 |
15:12:55.53 |
-14:06:25.9 |
HIP 74531 |
13.49 |
| 2026-02-16 12:00 |
15:12:56.15 |
-14:06:04.8 |
HIP 74531 |
13.22 |
| 2026-02-17 00:00 |
15:12:56.66 |
-14:05:43.2 |
HIP 74531 |
12.98 |
| 2026-02-17 12:00 |
15:12:57.08 |
-14:05:21.2 |
HIP 74531 |
12.77 |
| 2026-02-18 00:00 |
15:12:57.40 |
-14:04:58.9 |
HIP 74531 |
12.58 |
| 2026-02-18 12:00 |
15:12:57.62 |
-14:04:36.0 |
HIP 74531 |
12.43 |
| 2026-02-19 00:00 |
15:12:57.75 |
-14:04:12.8 |
HIP 74531 |
12.30 |
| 2026-02-19 12:00 |
15:12:57.77 |
-14:03:49.1 |
HIP 74531 |
12.21 |
| 2026-02-20 00:00 |
15:12:57.69 |
-14:03:25.1 |
HIP 74531 |
12.16 |
| 2026-02-20 12:00 |
15:12:57.52 |
-14:03:00.6 |
HIP 74531 |
12.14 |
| 2026-02-21 00:00 |
15:12:57.25 |
-14:02:35.6 |
HIP 74531 |
12.15 |
| 2026-02-21 12:00 |
15:12:56.87 |
-14:02:10.3 |
HIP 74531 |
12.21 |
| 2026-02-22 00:00 |
15:12:56.40 |
-14:01:44.5 |
HIP 74531 |
12.30 |
| 2026-02-22 12:00 |
15:12:55.83 |
-14:01:18.4 |
HIP 74531 |
12.44 |
| 2026-02-23 00:00 |
15:12:55.16 |
-14:00:51.8 |
HIP 74531 |
12.61 |
| 2026-02-23 12:00 |
15:12:54.39 |
-14:00:24.8 |
HIP 74531 |
12.82 |
| 2026-02-24 00:00 |
15:12:53.52 |
-13:59:57.3 |
HIP 74531 |
13.07 |