メタデータ
| 項目 |
値 |
| Designation |
C/2007 T1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-12-12T12:43:02.167680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:12Z |
| Obs used |
321 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
15.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-12-03.0000000 |
| e |
0.99975973 |
| q (au) |
0.968503 |
| a (au) |
4030.976593 |
| i (deg) |
117.642445 |
| Ω (om, deg) |
111.433284 |
| ω (w, deg) |
233.755132 |
| M (ma, deg) |
359.999963 |
等級
散乱 + 全体線形
$$
M_a = (10.423 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.423 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.980 |
| 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 |
| 2007-10-09 |
2007-11-17 |
+26.4957 |
-3.984 |
| 2007-12-28 |
2008-03-01 |
+0.7703 |
-2.913 |
| 2008-03-01 |
2008-04-10 |
+33.3065 |
-10.740 |
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 |
06:11:50.06 |
+53:47:22.0 |
HIP 29422 |
2.70 |
| 2026-05-12 12:00 |
06:11:53.75 |
+53:47:07.6 |
HIP 29422 |
2.85 |
| 2026-05-13 00:00 |
06:11:57.47 |
+53:46:53.2 |
HIP 29422 |
3.10 |
| 2026-05-13 12:00 |
06:12:01.22 |
+53:46:39.0 |
HIP 29422 |
3.44 |
| 2026-05-14 00:00 |
06:12:04.99 |
+53:46:25.0 |
HIP 29422 |
3.84 |
| 2026-05-14 12:00 |
06:12:08.79 |
+53:46:11.1 |
HIP 29422 |
4.30 |
| 2026-05-15 00:00 |
06:12:12.62 |
+53:45:57.3 |
HIP 29422 |
4.78 |
| 2026-05-15 12:00 |
06:12:16.47 |
+53:45:43.7 |
HIP 29422 |
5.29 |
| 2026-05-16 00:00 |
06:12:20.35 |
+53:45:30.2 |
HIP 29422 |
5.83 |
| 2026-05-16 12:00 |
06:12:24.25 |
+53:45:16.9 |
HIP 29422 |
6.37 |
| 2026-05-17 00:00 |
06:12:28.18 |
+53:45:03.7 |
HIP 29422 |
6.93 |
| 2026-05-17 12:00 |
06:12:32.13 |
+53:44:50.6 |
HIP 29422 |
7.50 |
| 2026-05-18 00:00 |
06:12:36.10 |
+53:44:37.8 |
HIP 29422 |
8.08 |
| 2026-05-18 12:00 |
06:12:40.10 |
+53:44:25.0 |
HIP 29422 |
8.67 |
| 2026-05-19 00:00 |
06:12:44.12 |
+53:44:12.4 |
HIP 29422 |
9.26 |
| 2026-05-19 12:00 |
06:12:48.16 |
+53:44:00.0 |
HIP 29422 |
9.86 |
| 2026-05-20 00:00 |
06:12:52.23 |
+53:43:47.7 |
HIP 29422 |
10.47 |
| 2026-05-20 12:00 |
06:12:56.32 |
+53:43:35.5 |
HIP 29422 |
11.08 |
| 2026-05-21 00:00 |
06:13:00.43 |
+53:43:23.6 |
HIP 29422 |
11.69 |
| 2026-05-21 12:00 |
06:13:04.56 |
+53:43:11.7 |
HIP 29422 |
12.31 |
| 2026-05-22 00:00 |
06:13:08.72 |
+53:43:00.0 |
HIP 29422 |
12.93 |
| 2026-05-22 12:00 |
06:13:12.89 |
+53:42:48.5 |
HIP 29422 |
13.55 |
| 2026-05-23 00:00 |
06:13:17.09 |
+53:42:37.1 |
HIP 29422 |
14.18 |
| 2026-05-23 12:00 |
06:13:21.30 |
+53:42:25.9 |
HIP 29422 |
14.81 |
| 2026-05-24 00:00 |
06:13:25.54 |
+53:42:14.9 |
HIP 29422 |
15.45 |
| 2026-05-24 12:00 |
06:13:29.79 |
+53:42:04.0 |
HIP 29422 |
16.08 |
| 2026-05-25 00:00 |
06:13:34.07 |
+53:41:53.2 |
HIP 29422 |
16.72 |
| 2026-05-25 12:00 |
06:13:38.36 |
+53:41:42.6 |
HIP 29422 |
17.36 |
| 2026-05-26 00:00 |
06:13:42.68 |
+53:41:32.2 |
HIP 29422 |
18.01 |
| 2026-05-26 12:00 |
06:13:47.01 |
+53:41:21.9 |
HIP 29422 |
18.66 |
| 2026-05-27 00:00 |
06:13:51.36 |
+53:41:11.8 |
HIP 29422 |
19.31 |
| 2026-05-27 12:00 |
06:13:55.73 |
+53:41:01.8 |
HIP 29491 |
19.89 |
| 2026-05-28 00:00 |
06:14:00.12 |
+53:40:52.0 |
HIP 29491 |
20.34 |
| 2026-05-28 12:00 |
06:14:04.52 |
+53:40:42.4 |
HIP 29491 |
20.81 |
| 2026-05-29 00:00 |
06:14:08.94 |
+53:40:32.9 |
HIP 29491 |
21.28 |
| 2026-05-29 12:00 |
06:14:13.38 |
+53:40:23.6 |
HIP 29491 |
21.76 |
| 2026-05-30 00:00 |
06:14:17.83 |
+53:40:14.5 |
HIP 29795 |
21.72 |
| 2026-05-30 12:00 |
06:14:22.30 |
+53:40:05.5 |
HIP 29795 |
21.07 |
| 2026-05-31 00:00 |
06:14:26.79 |
+53:39:56.6 |
HIP 29795 |
20.43 |
| 2026-05-31 12:00 |
06:14:31.29 |
+53:39:48.0 |
HIP 29795 |
19.79 |
| 2026-06-01 00:00 |
06:14:35.81 |
+53:39:39.4 |
HIP 29795 |
19.15 |
| 2026-06-01 12:00 |
06:14:40.34 |
+53:39:31.1 |
HIP 29795 |
18.51 |
| 2026-06-02 00:00 |
06:14:44.89 |
+53:39:22.9 |
HIP 29795 |
17.88 |