C/2012 T5 (Bressi)
メタデータ
| 項目 |
値 |
| Designation |
C/2012 T5 (Bressi) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-02-24T01:24:11.816640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:24Z |
| Obs used |
661 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
4.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-11-22.0000000 |
| e |
1.00043352 |
| q (au) |
0.322826 |
| a (au) |
-744.660040 |
| i (deg) |
72.098415 |
| Ω (om, deg) |
230.594454 |
| ω (w, deg) |
318.094191 |
| M (ma, deg) |
-0.004562 |
等級
散乱 + 全体線形
$$
M_a = (14.928 + 3.929\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.928 |
| n |
3.929 |
| gf |
0.997 |
| gb |
-0.786 |
| k |
0.971 |
| δ90 |
9.996 |
| 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 |
| 2012-10-14 |
2012-11-06 |
-17.5616 |
+6.138 |
| 2012-11-06 |
2013-01-07 |
+0.0678 |
+0.211 |
| 2013-01-07 |
2013-01-29 |
+10.9332 |
-1.082 |
| 2013-01-29 |
2013-02-03 |
+0.8730 |
-2.352 |
| 2013-02-03 |
2013-02-10 |
-5.9313 |
-3.849 |
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) |
| 2026-02-03 00:00 |
23:40:02.64 |
+53:58:43.1 |
HIP 116692 |
29.68 |
| 2026-02-03 12:00 |
23:40:07.39 |
+53:58:21.0 |
HIP 117032 |
29.87 |
| 2026-02-04 00:00 |
23:40:12.17 |
+53:57:59.2 |
HIP 117032 |
29.20 |
| 2026-02-04 12:00 |
23:40:16.98 |
+53:57:37.9 |
HIP 117032 |
28.54 |
| 2026-02-05 00:00 |
23:40:21.82 |
+53:57:16.9 |
HIP 117032 |
27.88 |
| 2026-02-05 12:00 |
23:40:26.69 |
+53:56:56.3 |
HIP 117032 |
27.22 |
| 2026-02-06 00:00 |
23:40:31.58 |
+53:56:36.1 |
HIP 117032 |
26.56 |
| 2026-02-06 12:00 |
23:40:36.51 |
+53:56:16.4 |
HIP 117032 |
25.90 |
| 2026-02-07 00:00 |
23:40:41.47 |
+53:55:57.0 |
HIP 117032 |
25.24 |
| 2026-02-07 12:00 |
23:40:46.45 |
+53:55:38.0 |
HIP 117032 |
24.59 |
| 2026-02-08 00:00 |
23:40:51.46 |
+53:55:19.4 |
HIP 117032 |
23.94 |
| 2026-02-08 12:00 |
23:40:56.50 |
+53:55:01.2 |
HIP 117032 |
23.30 |
| 2026-02-09 00:00 |
23:41:01.56 |
+53:54:43.4 |
HIP 117032 |
22.66 |
| 2026-02-09 12:00 |
23:41:06.65 |
+53:54:26.0 |
HIP 117032 |
22.02 |
| 2026-02-10 00:00 |
23:41:11.77 |
+53:54:09.0 |
HIP 117032 |
21.39 |
| 2026-02-10 12:00 |
23:41:16.91 |
+53:53:52.4 |
HIP 117032 |
20.76 |
| 2026-02-11 00:00 |
23:41:22.08 |
+53:53:36.2 |
HIP 117032 |
20.14 |
| 2026-02-11 12:00 |
23:41:27.28 |
+53:53:20.5 |
HIP 117032 |
19.53 |
| 2026-02-12 00:00 |
23:41:32.50 |
+53:53:05.1 |
HIP 117032 |
18.93 |
| 2026-02-12 12:00 |
23:41:37.74 |
+53:52:50.1 |
HIP 117032 |
18.33 |
| 2026-02-13 00:00 |
23:41:43.01 |
+53:52:35.5 |
HIP 117032 |
17.75 |
| 2026-02-13 12:00 |
23:41:48.30 |
+53:52:21.4 |
HIP 117032 |
17.18 |
| 2026-02-14 00:00 |
23:41:53.61 |
+53:52:07.6 |
HIP 117032 |
16.62 |
| 2026-02-14 12:00 |
23:41:58.95 |
+53:51:54.3 |
HIP 117032 |
16.08 |
| 2026-02-15 00:00 |
23:42:04.31 |
+53:51:41.4 |
HIP 117032 |
15.55 |
| 2026-02-15 12:00 |
23:42:09.69 |
+53:51:28.8 |
HIP 117032 |
15.05 |
| 2026-02-16 00:00 |
23:42:15.10 |
+53:51:16.7 |
HIP 117032 |
14.56 |
| 2026-02-16 12:00 |
23:42:20.53 |
+53:51:05.0 |
HIP 117032 |
14.10 |
| 2026-02-17 00:00 |
23:42:25.97 |
+53:50:53.7 |
HIP 117032 |
13.67 |
| 2026-02-17 12:00 |
23:42:31.44 |
+53:50:42.9 |
HIP 117032 |
13.27 |
| 2026-02-18 00:00 |
23:42:36.93 |
+53:50:32.4 |
HIP 117032 |
12.90 |
| 2026-02-18 12:00 |
23:42:42.44 |
+53:50:22.4 |
HIP 117032 |
12.56 |
| 2026-02-19 00:00 |
23:42:47.97 |
+53:50:12.7 |
HIP 117032 |
12.27 |
| 2026-02-19 12:00 |
23:42:53.51 |
+53:50:03.5 |
HIP 117032 |
12.01 |
| 2026-02-20 00:00 |
23:42:59.08 |
+53:49:54.7 |
HIP 117032 |
11.81 |
| 2026-02-20 12:00 |
23:43:04.66 |
+53:49:46.3 |
HIP 117032 |
11.65 |
| 2026-02-21 00:00 |
23:43:10.26 |
+53:49:38.3 |
HIP 117032 |
11.54 |
| 2026-02-21 12:00 |
23:43:15.88 |
+53:49:30.7 |
HIP 117083 |
10.99 |
| 2026-02-22 00:00 |
23:43:21.52 |
+53:49:23.5 |
HIP 117083 |
10.32 |
| 2026-02-22 12:00 |
23:43:27.17 |
+53:49:16.7 |
HIP 117083 |
9.68 |
| 2026-02-23 00:00 |
23:43:32.84 |
+53:49:10.4 |
HIP 117083 |
9.08 |
| 2026-02-23 12:00 |
23:43:38.53 |
+53:49:04.5 |
HIP 117083 |
8.53 |
| 2026-02-24 00:00 |
23:43:44.23 |
+53:48:58.9 |
HIP 117083 |
8.03 |