メタデータ
| 項目 |
値 |
| Designation |
C/2009 T1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-10-08T06:04:38.959680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:34Z |
| Obs used |
141 |
| NEO |
- |
| M1 |
8.100 |
| K1 |
7.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-04-02.0000000 |
| e |
0.99830743 |
| q (au) |
6.220409 |
| a (au) |
3675.119595 |
| i (deg) |
89.893932 |
| Ω (om, deg) |
54.407386 |
| ω (w, deg) |
282.529051 |
| M (ma, deg) |
0.000777 |
等級
散乱 + 全体線形
$$
M_a = (1.546 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.546 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-06-01 00:00 |
01:50:59.68 |
+64:51:46.3 |
HIP 8603 |
0.96 |
| 2026-06-01 12:00 |
01:51:05.26 |
+64:52:28.7 |
HIP 8626 |
1.71 |
| 2026-06-02 00:00 |
01:51:10.80 |
+64:53:11.3 |
HIP 8632 |
1.74 |
| 2026-06-02 12:00 |
01:51:16.30 |
+64:53:54.1 |
HIP 8632 |
2.18 |
| 2026-06-03 00:00 |
01:51:21.77 |
+64:54:37.0 |
HIP 8632 |
2.86 |
| 2026-06-03 12:00 |
01:51:27.19 |
+64:55:20.2 |
HIP 8632 |
3.65 |
| 2026-06-04 00:00 |
01:51:32.57 |
+64:56:03.6 |
HIP 8632 |
4.50 |
| 2026-06-04 12:00 |
01:51:37.91 |
+64:56:47.2 |
HIP 8632 |
5.37 |
| 2026-06-05 00:00 |
01:51:43.20 |
+64:57:30.9 |
HIP 8632 |
6.25 |
| 2026-06-05 12:00 |
01:51:48.46 |
+64:58:14.8 |
HIP 8632 |
7.15 |
| 2026-06-06 00:00 |
01:51:53.67 |
+64:58:59.0 |
HIP 8632 |
8.05 |
| 2026-06-06 12:00 |
01:51:58.84 |
+64:59:43.3 |
HIP 8632 |
8.95 |
| 2026-06-07 00:00 |
01:52:03.96 |
+65:00:27.8 |
HIP 8632 |
9.86 |
| 2026-06-07 12:00 |
01:52:09.04 |
+65:01:12.5 |
HIP 8632 |
10.77 |
| 2026-06-08 00:00 |
01:52:14.08 |
+65:01:57.3 |
HIP 8632 |
11.68 |
| 2026-06-08 12:00 |
01:52:19.07 |
+65:02:42.3 |
HIP 8632 |
12.60 |
| 2026-06-09 00:00 |
01:52:24.02 |
+65:03:27.6 |
HIP 8632 |
13.51 |
| 2026-06-09 12:00 |
01:52:28.92 |
+65:04:12.9 |
HIP 8632 |
14.42 |
| 2026-06-10 00:00 |
01:52:33.78 |
+65:04:58.5 |
HIP 8632 |
15.34 |
| 2026-06-10 12:00 |
01:52:38.59 |
+65:05:44.2 |
HIP 8632 |
16.25 |
| 2026-06-11 00:00 |
01:52:43.35 |
+65:06:30.1 |
HIP 8632 |
17.16 |
| 2026-06-11 12:00 |
01:52:48.07 |
+65:07:16.1 |
HIP 8632 |
18.08 |
| 2026-06-12 00:00 |
01:52:52.74 |
+65:08:02.3 |
HIP 8632 |
18.99 |
| 2026-06-12 12:00 |
01:52:57.36 |
+65:08:48.6 |
HIP 8632 |
19.90 |
| 2026-06-13 00:00 |
01:53:01.93 |
+65:09:35.1 |
HIP 8632 |
20.81 |
| 2026-06-13 12:00 |
01:53:06.45 |
+65:10:21.8 |
HIP 8632 |
21.73 |
| 2026-06-14 00:00 |
01:53:10.92 |
+65:11:08.6 |
HIP 8632 |
22.64 |
| 2026-06-14 12:00 |
01:53:15.35 |
+65:11:55.6 |
HIP 8632 |
23.55 |
| 2026-06-15 00:00 |
01:53:19.72 |
+65:12:42.7 |
HIP 8632 |
24.45 |
| 2026-06-15 12:00 |
01:53:24.04 |
+65:13:29.9 |
HIP 9026 |
25.16 |
| 2026-06-16 00:00 |
01:53:28.31 |
+65:14:17.3 |
HIP 9026 |
24.28 |
| 2026-06-16 12:00 |
01:53:32.53 |
+65:15:04.8 |
HIP 9026 |
23.42 |
| 2026-06-17 00:00 |
01:53:36.70 |
+65:15:52.4 |
HIP 9026 |
22.56 |
| 2026-06-17 12:00 |
01:53:40.81 |
+65:16:40.2 |
HIP 9026 |
21.70 |
| 2026-06-18 00:00 |
01:53:44.88 |
+65:17:28.1 |
HIP 9026 |
20.86 |
| 2026-06-18 12:00 |
01:53:48.88 |
+65:18:16.1 |
HIP 9026 |
20.02 |
| 2026-06-19 00:00 |
01:53:52.84 |
+65:19:04.3 |
HIP 9026 |
19.19 |
| 2026-06-19 12:00 |
01:53:56.74 |
+65:19:52.6 |
HIP 9026 |
18.37 |
| 2026-06-20 00:00 |
01:54:00.59 |
+65:20:40.9 |
HIP 9026 |
17.57 |
| 2026-06-20 12:00 |
01:54:04.38 |
+65:21:29.4 |
HIP 9026 |
16.77 |
| 2026-06-21 00:00 |
01:54:08.12 |
+65:22:18.0 |
HIP 9026 |
16.00 |
| 2026-06-21 12:00 |
01:54:11.80 |
+65:23:06.7 |
HIP 9026 |
15.24 |
| 2026-06-22 00:00 |
01:54:15.43 |
+65:23:55.6 |
HIP 9026 |
14.50 |