メタデータ
| 項目 |
値 |
| Designation |
55P/Tempel-Tuttle |
| Type |
P |
| Perihelion (tp_cal, UTC) |
1998-02-28T02:20:44.226240Z |
| Orbit solution date (soln_date, UTC) |
2002-01-03T16:05:39Z |
| Obs used |
392 |
| NEO |
Yes |
| M1 |
10.000 |
| K1 |
25.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-08-15.0000000 |
| e |
0.90555272 |
| q (au) |
0.976428 |
| a (au) |
10.338338 |
| i (deg) |
162.486575 |
| Ω (om, deg) |
235.270989 |
| ω (w, deg) |
172.500274 |
| M (ma, deg) |
4.978340 |
等級
散乱 + 全体線形
$$
M_a = (8.795 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.795 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1996-05-12 |
1998-01-01 |
-1.9145 |
+1.548 |
| 1998-01-01 |
1998-01-27 |
+5.5017 |
-0.086 |
| 1998-01-27 |
1998-02-28 |
+19.7139 |
-0.354 |
| 1998-02-28 |
1998-07-05 |
+8.1609 |
-1.479 |
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) |
| 2026-03-26 00:00 |
15:03:30.87 |
-13:26:09.1 |
HIP 73516 |
29.25 |
| 2026-03-26 12:00 |
15:03:23.15 |
-13:25:24.9 |
HIP 73516 |
27.26 |
| 2026-03-27 00:00 |
15:03:15.37 |
-13:24:40.5 |
HIP 73516 |
25.26 |
| 2026-03-27 12:00 |
15:03:07.52 |
-13:23:55.9 |
HIP 73516 |
23.25 |
| 2026-03-28 00:00 |
15:02:59.61 |
-13:23:11.0 |
HIP 73516 |
21.23 |
| 2026-03-28 12:00 |
15:02:51.63 |
-13:22:25.8 |
HIP 73516 |
19.21 |
| 2026-03-29 00:00 |
15:02:43.59 |
-13:21:40.5 |
HIP 73516 |
17.18 |
| 2026-03-29 12:00 |
15:02:35.49 |
-13:20:54.9 |
HIP 73516 |
15.15 |
| 2026-03-30 00:00 |
15:02:27.33 |
-13:20:09.0 |
HIP 73516 |
13.13 |
| 2026-03-30 12:00 |
15:02:19.10 |
-13:19:23.0 |
HIP 73516 |
11.15 |
| 2026-03-31 00:00 |
15:02:10.82 |
-13:18:36.7 |
HIP 73516 |
9.21 |
| 2026-03-31 12:00 |
15:02:02.47 |
-13:17:50.2 |
HIP 73516 |
7.39 |
| 2026-04-01 00:00 |
15:01:54.07 |
-13:17:03.5 |
HIP 73516 |
5.81 |
| 2026-04-01 12:00 |
15:01:45.61 |
-13:16:16.6 |
HIP 73516 |
4.72 |
| 2026-04-02 00:00 |
15:01:37.08 |
-13:15:29.4 |
HIP 73516 |
4.54 |
| 2026-04-02 12:00 |
15:01:28.51 |
-13:14:42.1 |
HIP 73516 |
5.37 |
| 2026-04-03 00:00 |
15:01:19.87 |
-13:13:54.5 |
HIP 73516 |
6.86 |
| 2026-04-03 12:00 |
15:01:11.18 |
-13:13:06.7 |
HIP 73516 |
8.70 |
| 2026-04-04 00:00 |
15:01:02.43 |
-13:12:18.8 |
HIP 73516 |
10.71 |
| 2026-04-04 12:00 |
15:00:53.62 |
-13:11:30.6 |
HIP 73516 |
12.82 |
| 2026-04-05 00:00 |
15:00:44.77 |
-13:10:42.3 |
HIP 73516 |
15.00 |
| 2026-04-05 12:00 |
15:00:35.85 |
-13:09:53.7 |
HIP 73516 |
17.22 |
| 2026-04-06 00:00 |
15:00:26.89 |
-13:09:05.0 |
HIP 73516 |
19.48 |
| 2026-04-06 12:00 |
15:00:17.87 |
-13:08:16.1 |
HIP 73516 |
21.76 |
| 2026-04-07 00:00 |
15:00:08.80 |
-13:07:26.9 |
HIP 73516 |
24.07 |
| 2026-04-07 12:00 |
14:59:59.68 |
-13:06:37.7 |
HIP 73516 |
26.40 |
| 2026-04-08 00:00 |
14:59:50.51 |
-13:05:48.2 |
HIP 73291 |
25.72 |
| 2026-04-08 12:00 |
14:59:41.28 |
-13:04:58.5 |
HIP 73291 |
23.67 |
| 2026-04-09 00:00 |
14:59:32.01 |
-13:04:08.7 |
HIP 73291 |
21.68 |
| 2026-04-09 12:00 |
14:59:22.69 |
-13:03:18.8 |
HIP 73291 |
19.78 |
| 2026-04-10 00:00 |
14:59:13.32 |
-13:02:28.6 |
HIP 73291 |
18.00 |
| 2026-04-10 12:00 |
14:59:03.91 |
-13:01:38.3 |
HIP 73291 |
16.38 |
| 2026-04-11 00:00 |
14:58:54.45 |
-13:00:47.9 |
HIP 73291 |
14.97 |
| 2026-04-11 12:00 |
14:58:44.94 |
-12:59:57.2 |
HIP 73291 |
13.86 |
| 2026-04-12 00:00 |
14:58:35.39 |
-12:59:06.5 |
HIP 73291 |
13.13 |
| 2026-04-12 12:00 |
14:58:25.79 |
-12:58:15.6 |
HIP 73291 |
12.83 |
| 2026-04-13 00:00 |
14:58:16.15 |
-12:57:24.5 |
HIP 73291 |
13.02 |
| 2026-04-13 12:00 |
14:58:06.47 |
-12:56:33.3 |
HIP 73291 |
13.68 |
| 2026-04-14 00:00 |
14:57:56.75 |
-12:55:42.0 |
HIP 73291 |
14.74 |
| 2026-04-14 12:00 |
14:57:46.98 |
-12:54:50.5 |
HIP 73291 |
16.14 |
| 2026-04-15 00:00 |
14:57:37.18 |
-12:53:59.0 |
HIP 73200 |
15.70 |
| 2026-04-15 12:00 |
14:57:27.33 |
-12:53:07.2 |
HIP 73200 |
15.01 |
| 2026-04-16 00:00 |
14:57:17.45 |
-12:52:15.4 |
HIP 73200 |
14.74 |