C/2012 C1 (McNaught)
メタデータ
| 項目 |
値 |
| Designation |
C/2012 C1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-02-04T12:32:23.248320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:00Z |
| Obs used |
219 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
11.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-11-05.0000000 |
| e |
0.99620583 |
| q (au) |
4.837975 |
| a (au) |
1275.108361 |
| i (deg) |
96.277709 |
| Ω (om, deg) |
300.639926 |
| ω (w, deg) |
279.889151 |
| M (ma, deg) |
359.998019 |
等級
散乱 + 全体線形
$$
M_a = (2.681 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.681 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
19:11:25.94 |
+26:11:14.4 |
HIP 94308 |
5.67 |
| 2026-02-03 12:00 |
19:11:30.02 |
+26:11:48.6 |
HIP 94308 |
4.61 |
| 2026-02-04 00:00 |
19:11:34.07 |
+26:12:23.3 |
HIP 94308 |
3.56 |
| 2026-02-04 12:00 |
19:11:38.11 |
+26:12:58.2 |
HIP 94308 |
2.52 |
| 2026-02-05 00:00 |
19:11:42.13 |
+26:13:33.6 |
HIP 94308 |
1.54 |
| 2026-02-05 12:00 |
19:11:46.13 |
+26:14:09.2 |
HIP 94308 |
0.84 |
| 2026-02-06 00:00 |
19:11:50.11 |
+26:14:45.2 |
HIP 94308 |
1.16 |
| 2026-02-06 12:00 |
19:11:54.06 |
+26:15:21.6 |
HIP 94308 |
2.07 |
| 2026-02-07 00:00 |
19:11:58.00 |
+26:15:58.2 |
HIP 94308 |
3.08 |
| 2026-02-07 12:00 |
19:12:01.92 |
+26:16:35.3 |
HIP 94308 |
4.12 |
| 2026-02-08 00:00 |
19:12:05.81 |
+26:17:12.6 |
HIP 94308 |
5.18 |
| 2026-02-08 12:00 |
19:12:09.69 |
+26:17:50.3 |
HIP 94308 |
6.23 |
| 2026-02-09 00:00 |
19:12:13.54 |
+26:18:28.3 |
HIP 94308 |
7.29 |
| 2026-02-09 12:00 |
19:12:17.37 |
+26:19:06.6 |
HIP 94308 |
8.35 |
| 2026-02-10 00:00 |
19:12:21.18 |
+26:19:45.3 |
HIP 94308 |
9.42 |
| 2026-02-10 12:00 |
19:12:24.97 |
+26:20:24.3 |
HIP 94308 |
10.48 |
| 2026-02-11 00:00 |
19:12:28.73 |
+26:21:03.6 |
HIP 94308 |
11.54 |
| 2026-02-11 12:00 |
19:12:32.47 |
+26:21:43.2 |
HIP 94448 |
10.86 |
| 2026-02-12 00:00 |
19:12:36.19 |
+26:22:23.1 |
HIP 94448 |
9.91 |
| 2026-02-12 12:00 |
19:12:39.88 |
+26:23:03.4 |
HIP 94448 |
8.98 |
| 2026-02-13 00:00 |
19:12:43.55 |
+26:23:43.9 |
HIP 94448 |
8.09 |
| 2026-02-13 12:00 |
19:12:47.19 |
+26:24:24.8 |
HIP 94448 |
7.25 |
| 2026-02-14 00:00 |
19:12:50.81 |
+26:25:06.0 |
HIP 94448 |
6.49 |
| 2026-02-14 12:00 |
19:12:54.41 |
+26:25:47.5 |
HIP 94448 |
5.82 |
| 2026-02-15 00:00 |
19:12:57.97 |
+26:26:29.3 |
HIP 94448 |
5.30 |
| 2026-02-15 12:00 |
19:13:01.52 |
+26:27:11.4 |
HIP 94448 |
4.96 |
| 2026-02-16 00:00 |
19:13:05.04 |
+26:27:53.8 |
HIP 94448 |
4.84 |
| 2026-02-16 12:00 |
19:13:08.53 |
+26:28:36.5 |
HIP 94448 |
4.95 |
| 2026-02-17 00:00 |
19:13:11.99 |
+26:29:19.5 |
HIP 94448 |
5.29 |
| 2026-02-17 12:00 |
19:13:15.43 |
+26:30:02.7 |
HIP 94448 |
5.81 |
| 2026-02-18 00:00 |
19:13:18.85 |
+26:30:46.3 |
HIP 94448 |
6.46 |
| 2026-02-18 12:00 |
19:13:22.23 |
+26:31:30.1 |
HIP 94448 |
7.21 |
| 2026-02-19 00:00 |
19:13:25.59 |
+26:32:14.3 |
HIP 94448 |
8.04 |
| 2026-02-19 12:00 |
19:13:28.92 |
+26:32:58.7 |
HIP 94448 |
8.91 |
| 2026-02-20 00:00 |
19:13:32.22 |
+26:33:43.4 |
HIP 94448 |
9.82 |
| 2026-02-20 12:00 |
19:13:35.49 |
+26:34:28.3 |
HIP 94448 |
10.76 |
| 2026-02-21 00:00 |
19:13:38.74 |
+26:35:13.6 |
HIP 94448 |
11.72 |
| 2026-02-21 12:00 |
19:13:41.95 |
+26:35:59.1 |
HIP 94448 |
12.70 |
| 2026-02-22 00:00 |
19:13:45.14 |
+26:36:44.8 |
HIP 94448 |
13.69 |
| 2026-02-22 12:00 |
19:13:48.30 |
+26:37:30.9 |
HIP 94569 |
14.54 |
| 2026-02-23 00:00 |
19:13:51.42 |
+26:38:17.2 |
HIP 94569 |
13.58 |
| 2026-02-23 12:00 |
19:13:54.52 |
+26:39:03.7 |
HIP 94569 |
12.64 |
| 2026-02-24 00:00 |
19:13:57.59 |
+26:39:50.5 |
HIP 94569 |
11.72 |