メタデータ
| 項目 |
値 |
| Designation |
C/2011 R1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-10-19T14:54:08.481600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:56Z |
| Obs used |
1454 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
6.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-10-24.0000000 |
| e |
1.00074117 |
| q (au) |
2.079571 |
| a (au) |
-2805.810838 |
| i (deg) |
116.196842 |
| Ω (om, deg) |
221.408458 |
| ω (w, deg) |
308.861192 |
| M (ma, deg) |
0.000029 |
等級
散乱 + 全体線形
$$
M_a = (10.666 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.666 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2010-10-11 |
2012-04-01 |
+7.1902 |
-6.300 |
| 2012-04-01 |
2012-10-15 |
-6.1910 |
-0.092 |
| 2012-12-23 |
2013-02-17 |
+39.6659 |
-16.680 |
| 2013-02-17 |
2014-04-11 |
+3.1359 |
-1.430 |
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 |
10:37:50.57 |
+80:18:57.0 |
HIP 51883 |
11.64 |
| 2026-05-12 12:00 |
10:37:43.05 |
+80:18:08.4 |
HIP 51883 |
12.28 |
| 2026-05-13 00:00 |
10:37:35.72 |
+80:17:19.6 |
HIP 51883 |
12.96 |
| 2026-05-13 12:00 |
10:37:28.59 |
+80:16:30.6 |
HIP 51883 |
13.66 |
| 2026-05-14 00:00 |
10:37:21.65 |
+80:15:41.4 |
HIP 51883 |
14.38 |
| 2026-05-14 12:00 |
10:37:14.92 |
+80:14:52.1 |
HIP 51883 |
15.12 |
| 2026-05-15 00:00 |
10:37:08.38 |
+80:14:02.6 |
HIP 51883 |
15.88 |
| 2026-05-15 12:00 |
10:37:02.03 |
+80:13:12.9 |
HIP 51883 |
16.65 |
| 2026-05-16 00:00 |
10:36:55.88 |
+80:12:23.1 |
HIP 51883 |
17.44 |
| 2026-05-16 12:00 |
10:36:49.93 |
+80:11:33.1 |
HIP 51883 |
18.24 |
| 2026-05-17 00:00 |
10:36:44.17 |
+80:10:43.0 |
HIP 51883 |
19.04 |
| 2026-05-17 12:00 |
10:36:38.60 |
+80:09:52.8 |
HIP 52096 |
18.46 |
| 2026-05-18 00:00 |
10:36:33.23 |
+80:09:02.4 |
HIP 52096 |
17.73 |
| 2026-05-18 12:00 |
10:36:28.05 |
+80:08:11.9 |
HIP 52096 |
17.01 |
| 2026-05-19 00:00 |
10:36:23.06 |
+80:07:21.2 |
HIP 52096 |
16.30 |
| 2026-05-19 12:00 |
10:36:18.27 |
+80:06:30.4 |
HIP 52096 |
15.61 |
| 2026-05-20 00:00 |
10:36:13.66 |
+80:05:39.6 |
HIP 52096 |
14.92 |
| 2026-05-20 12:00 |
10:36:09.24 |
+80:04:48.6 |
HIP 52096 |
14.25 |
| 2026-05-21 00:00 |
10:36:05.02 |
+80:03:57.5 |
HIP 52096 |
13.60 |
| 2026-05-21 12:00 |
10:36:00.98 |
+80:03:06.3 |
HIP 52096 |
12.97 |
| 2026-05-22 00:00 |
10:35:57.13 |
+80:02:14.9 |
HIP 52096 |
12.36 |
| 2026-05-22 12:00 |
10:35:53.46 |
+80:01:23.5 |
HIP 52096 |
11.78 |
| 2026-05-23 00:00 |
10:35:49.99 |
+80:00:32.1 |
HIP 52096 |
11.23 |
| 2026-05-23 12:00 |
10:35:46.69 |
+79:59:40.5 |
HIP 52096 |
10.72 |
| 2026-05-24 00:00 |
10:35:43.58 |
+79:58:48.8 |
HIP 52096 |
10.25 |
| 2026-05-24 12:00 |
10:35:40.66 |
+79:57:57.1 |
HIP 52096 |
9.82 |
| 2026-05-25 00:00 |
10:35:37.91 |
+79:57:05.3 |
HIP 52096 |
9.45 |
| 2026-05-25 12:00 |
10:35:35.35 |
+79:56:13.4 |
HIP 52096 |
9.15 |
| 2026-05-26 00:00 |
10:35:32.97 |
+79:55:21.4 |
HIP 52096 |
8.90 |
| 2026-05-26 12:00 |
10:35:30.77 |
+79:54:29.4 |
HIP 52096 |
8.74 |
| 2026-05-27 00:00 |
10:35:28.75 |
+79:53:37.3 |
HIP 52096 |
8.65 |
| 2026-05-27 12:00 |
10:35:26.90 |
+79:52:45.2 |
HIP 52096 |
8.64 |
| 2026-05-28 00:00 |
10:35:25.23 |
+79:51:53.0 |
HIP 52096 |
8.71 |
| 2026-05-28 12:00 |
10:35:23.74 |
+79:51:00.8 |
HIP 52096 |
8.85 |
| 2026-05-29 00:00 |
10:35:22.42 |
+79:50:08.5 |
HIP 52096 |
9.08 |
| 2026-05-29 12:00 |
10:35:21.28 |
+79:49:16.2 |
HIP 52096 |
9.37 |
| 2026-05-30 00:00 |
10:35:20.31 |
+79:48:23.9 |
HIP 52096 |
9.73 |
| 2026-05-30 12:00 |
10:35:19.52 |
+79:47:31.5 |
HIP 52096 |
10.14 |
| 2026-05-31 00:00 |
10:35:18.89 |
+79:46:39.1 |
HIP 52096 |
10.60 |
| 2026-05-31 12:00 |
10:35:18.44 |
+79:45:46.7 |
HIP 52096 |
11.11 |
| 2026-06-01 00:00 |
10:35:18.15 |
+79:44:54.2 |
HIP 52096 |
11.65 |
| 2026-06-01 12:00 |
10:35:18.04 |
+79:44:01.8 |
HIP 52096 |
12.23 |
| 2026-06-02 00:00 |
10:35:18.09 |
+79:43:09.3 |
HIP 52096 |
12.83 |