メタデータ
| 項目 |
値 |
| Designation |
C/2012 T4 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-10-10T22:22:44.699520Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:03Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
6.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-10-18.0000000 |
| e |
0.99118923 |
| q (au) |
1.955997 |
| a (au) |
222.000586 |
| i (deg) |
24.085273 |
| Ω (om, deg) |
99.368559 |
| ω (w, deg) |
219.915260 |
| M (ma, deg) |
0.002106 |
等級
散乱 + 全体線形
$$
M_a = (14.048 + 4.167\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.048 |
| n |
4.167 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.990 |
| 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) |
| 2026-05-12 00:00 |
07:20:27.18 |
+26:39:59.6 |
HIP 35639 |
14.96 |
| 2026-05-12 12:00 |
07:20:29.75 |
+26:39:52.6 |
HIP 35639 |
14.47 |
| 2026-05-13 00:00 |
07:20:32.36 |
+26:39:45.5 |
HIP 35639 |
13.97 |
| 2026-05-13 12:00 |
07:20:34.99 |
+26:39:38.4 |
HIP 35639 |
13.48 |
| 2026-05-14 00:00 |
07:20:37.66 |
+26:39:31.2 |
HIP 35639 |
13.00 |
| 2026-05-14 12:00 |
07:20:40.35 |
+26:39:24.1 |
HIP 35639 |
12.52 |
| 2026-05-15 00:00 |
07:20:43.07 |
+26:39:16.9 |
HIP 35639 |
12.05 |
| 2026-05-15 12:00 |
07:20:45.82 |
+26:39:09.6 |
HIP 35639 |
11.60 |
| 2026-05-16 00:00 |
07:20:48.60 |
+26:39:02.4 |
HIP 35639 |
11.15 |
| 2026-05-16 12:00 |
07:20:51.40 |
+26:38:55.1 |
HIP 35639 |
10.72 |
| 2026-05-17 00:00 |
07:20:54.24 |
+26:38:47.7 |
HIP 35639 |
10.30 |
| 2026-05-17 12:00 |
07:20:57.10 |
+26:38:40.4 |
HIP 35639 |
9.91 |
| 2026-05-18 00:00 |
07:20:59.98 |
+26:38:33.0 |
HIP 35639 |
9.54 |
| 2026-05-18 12:00 |
07:21:02.90 |
+26:38:25.6 |
HIP 35639 |
9.21 |
| 2026-05-19 00:00 |
07:21:05.84 |
+26:38:18.1 |
HIP 35639 |
8.91 |
| 2026-05-19 12:00 |
07:21:08.81 |
+26:38:10.7 |
HIP 35639 |
8.65 |
| 2026-05-20 00:00 |
07:21:11.80 |
+26:38:03.2 |
HIP 35639 |
8.43 |
| 2026-05-20 12:00 |
07:21:14.82 |
+26:37:55.6 |
HIP 35639 |
8.26 |
| 2026-05-21 00:00 |
07:21:17.87 |
+26:37:48.1 |
HIP 35639 |
8.15 |
| 2026-05-21 12:00 |
07:21:20.94 |
+26:37:40.5 |
HIP 35639 |
8.10 |
| 2026-05-22 00:00 |
07:21:24.03 |
+26:37:32.9 |
HIP 35639 |
8.11 |
| 2026-05-22 12:00 |
07:21:27.15 |
+26:37:25.3 |
HIP 35639 |
8.18 |
| 2026-05-23 00:00 |
07:21:30.30 |
+26:37:17.6 |
HIP 35639 |
8.31 |
| 2026-05-23 12:00 |
07:21:33.47 |
+26:37:09.9 |
HIP 35639 |
8.50 |
| 2026-05-24 00:00 |
07:21:36.67 |
+26:37:02.2 |
HIP 35639 |
8.75 |
| 2026-05-24 12:00 |
07:21:39.89 |
+26:36:54.5 |
HIP 35639 |
9.06 |
| 2026-05-25 00:00 |
07:21:43.13 |
+26:36:46.8 |
HIP 35639 |
9.41 |
| 2026-05-25 12:00 |
07:21:46.40 |
+26:36:39.0 |
HIP 35639 |
9.81 |
| 2026-05-26 00:00 |
07:21:49.69 |
+26:36:31.2 |
HIP 35639 |
10.25 |
| 2026-05-26 12:00 |
07:21:53.00 |
+26:36:23.4 |
HIP 35639 |
10.74 |
| 2026-05-27 00:00 |
07:21:56.34 |
+26:36:15.6 |
HIP 35639 |
11.25 |
| 2026-05-27 12:00 |
07:21:59.70 |
+26:36:07.8 |
HIP 35639 |
11.79 |
| 2026-05-28 00:00 |
07:22:03.08 |
+26:35:59.9 |
HIP 35639 |
12.37 |
| 2026-05-28 12:00 |
07:22:06.48 |
+26:35:52.0 |
HIP 35639 |
12.96 |
| 2026-05-29 00:00 |
07:22:09.91 |
+26:35:44.1 |
HIP 35639 |
13.58 |
| 2026-05-29 12:00 |
07:22:13.36 |
+26:35:36.2 |
HIP 35639 |
14.22 |
| 2026-05-30 00:00 |
07:22:16.83 |
+26:35:28.3 |
HIP 35639 |
14.88 |
| 2026-05-30 12:00 |
07:22:20.32 |
+26:35:20.3 |
HIP 35639 |
15.55 |
| 2026-05-31 00:00 |
07:22:23.83 |
+26:35:12.4 |
HIP 35639 |
16.24 |
| 2026-05-31 12:00 |
07:22:27.37 |
+26:35:04.4 |
HIP 35639 |
16.94 |
| 2026-06-01 00:00 |
07:22:30.92 |
+26:34:56.4 |
HIP 35639 |
17.66 |
| 2026-06-01 12:00 |
07:22:34.50 |
+26:34:48.4 |
HIP 35639 |
18.38 |
| 2026-06-02 00:00 |
07:22:38.09 |
+26:34:40.4 |
HIP 35639 |
19.12 |