メタデータ
| 項目 |
値 |
| Designation |
41P/Tuttle-Giacobini-Kresak |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-04-12T18:04:18.526080Z |
| Orbit solution date (soln_date, UTC) |
2023-09-29T16:16:14Z |
| Obs used |
4300 |
| NEO |
Yes |
| M1 |
16.900 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-04-14.0000000 |
| e |
0.66127330 |
| q (au) |
1.045043 |
| a (au) |
3.085209 |
| i (deg) |
9.228466 |
| Ω (om, deg) |
141.058972 |
| ω (w, deg) |
62.166743 |
| M (ma, deg) |
0.226802 |
等級
散乱 + 全体線形
$$
M_a = (11.530 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.530 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-0.863 |
| k |
0.997 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
03:53:04.40 |
+11:25:54.0 |
HIP 18335 |
32.26 |
| 2026-07-29 12:00 |
03:53:22.78 |
+11:26:03.2 |
HIP 18335 |
27.94 |
| 2026-07-30 00:00 |
03:53:41.05 |
+11:26:11.7 |
HIP 18335 |
23.72 |
| 2026-07-30 12:00 |
03:53:59.20 |
+11:26:19.3 |
HIP 18335 |
19.63 |
| 2026-07-31 00:00 |
03:54:17.23 |
+11:26:26.0 |
HIP 18335 |
15.77 |
| 2026-07-31 12:00 |
03:54:35.14 |
+11:26:32.0 |
HIP 18335 |
12.29 |
| 2026-08-01 00:00 |
03:54:52.93 |
+11:26:37.2 |
HIP 18335 |
9.60 |
| 2026-08-01 12:00 |
03:55:10.59 |
+11:26:41.5 |
HIP 18335 |
8.43 |
| 2026-08-02 00:00 |
03:55:28.13 |
+11:26:45.0 |
HIP 18335 |
9.33 |
| 2026-08-02 12:00 |
03:55:45.54 |
+11:26:47.7 |
HIP 18335 |
11.80 |
| 2026-08-03 00:00 |
03:56:02.83 |
+11:26:49.6 |
HIP 18335 |
15.06 |
| 2026-08-03 12:00 |
03:56:19.99 |
+11:26:50.6 |
HIP 18335 |
18.68 |
| 2026-08-04 00:00 |
03:56:37.02 |
+11:26:50.8 |
HIP 18520 |
14.69 |
| 2026-08-04 12:00 |
03:56:53.91 |
+11:26:50.2 |
HIP 18520 |
10.67 |
| 2026-08-05 00:00 |
03:57:10.68 |
+11:26:48.7 |
HIP 18520 |
6.83 |
| 2026-08-05 12:00 |
03:57:27.31 |
+11:26:46.4 |
HIP 18520 |
3.68 |
| 2026-08-06 00:00 |
03:57:43.81 |
+11:26:43.3 |
HIP 18520 |
3.68 |
| 2026-08-06 12:00 |
03:58:00.17 |
+11:26:39.3 |
HIP 18520 |
6.77 |
| 2026-08-07 00:00 |
03:58:16.40 |
+11:26:34.5 |
HIP 18520 |
10.48 |
| 2026-08-07 12:00 |
03:58:32.48 |
+11:26:28.8 |
HIP 18520 |
14.30 |
| 2026-08-08 00:00 |
03:58:48.43 |
+11:26:22.3 |
HIP 18520 |
18.14 |
| 2026-08-08 12:00 |
03:59:04.23 |
+11:26:15.0 |
HIP 18520 |
21.98 |
| 2026-08-09 00:00 |
03:59:19.89 |
+11:26:06.8 |
HIP 18520 |
25.79 |
| 2026-08-09 12:00 |
03:59:35.41 |
+11:25:57.8 |
HIP 18581 |
28.17 |
| 2026-08-10 00:00 |
03:59:50.78 |
+11:25:47.9 |
HIP 18581 |
30.12 |
| 2026-08-10 12:00 |
04:00:06.00 |
+11:25:37.2 |
HIP 18825 |
29.76 |
| 2026-08-11 00:00 |
04:00:21.07 |
+11:25:25.6 |
HIP 18825 |
26.15 |
| 2026-08-11 12:00 |
04:00:36.00 |
+11:25:13.1 |
HIP 18825 |
22.59 |
| 2026-08-12 00:00 |
04:00:50.77 |
+11:24:59.8 |
HIP 18825 |
19.11 |
| 2026-08-12 12:00 |
04:01:05.39 |
+11:24:45.7 |
HIP 18825 |
15.72 |
| 2026-08-13 00:00 |
04:01:19.85 |
+11:24:30.7 |
HIP 18825 |
12.47 |
| 2026-08-13 12:00 |
04:01:34.16 |
+11:24:14.8 |
HIP 18825 |
9.46 |
| 2026-08-14 00:00 |
04:01:48.31 |
+11:23:58.1 |
HIP 18825 |
6.95 |
| 2026-08-14 12:00 |
04:02:02.30 |
+11:23:40.6 |
HIP 18825 |
5.59 |
| 2026-08-15 00:00 |
04:02:16.13 |
+11:23:22.2 |
HIP 18825 |
6.12 |
| 2026-08-15 12:00 |
04:02:29.80 |
+11:23:02.9 |
HIP 18890 |
7.18 |
| 2026-08-16 00:00 |
04:02:43.31 |
+11:22:42.8 |
HIP 18890 |
3.86 |
| 2026-08-16 12:00 |
04:02:56.66 |
+11:22:21.8 |
HIP 18890 |
0.65 |
| 2026-08-17 00:00 |
04:03:09.84 |
+11:22:00.0 |
HIP 18890 |
2.71 |
| 2026-08-17 12:00 |
04:03:22.85 |
+11:21:37.3 |
HIP 18890 |
5.91 |
| 2026-08-18 00:00 |
04:03:35.70 |
+11:21:13.8 |
HIP 18890 |
9.08 |
| 2026-08-18 12:00 |
04:03:48.38 |
+11:20:49.4 |
HIP 18890 |
12.21 |
| 2026-08-19 00:00 |
04:04:00.89 |
+11:20:24.1 |
HIP 18890 |
15.31 |