メタデータ
| 項目 |
値 |
| Designation |
79P/du Toit-Hartley |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-05-28T09:52:27.811200Z |
| Orbit solution date (soln_date, UTC) |
2021-05-04T14:20:50Z |
| Obs used |
215 |
| NEO |
Yes |
| M1 |
17.400 |
| 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) |
2007-10-18.0000000 |
| e |
0.59408527 |
| q (au) |
1.230504 |
| a (au) |
3.031435 |
| i (deg) |
2.893178 |
| Ω (om, deg) |
307.838646 |
| ω (w, deg) |
253.269688 |
| M (ma, deg) |
318.280693 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
02:31:09.43 |
+18:01:58.9 |
HIP 11698 |
20.06 |
| 2026-07-29 12:00 |
02:31:18.53 |
+18:02:59.1 |
HIP 11698 |
21.52 |
| 2026-07-30 00:00 |
02:31:27.46 |
+18:03:58.5 |
HIP 11781 |
20.27 |
| 2026-07-30 12:00 |
02:31:36.21 |
+18:04:57.1 |
HIP 11781 |
18.58 |
| 2026-07-31 00:00 |
02:31:44.79 |
+18:05:55.0 |
HIP 11781 |
17.05 |
| 2026-07-31 12:00 |
02:31:53.19 |
+18:06:52.1 |
HIP 11781 |
15.72 |
| 2026-08-01 00:00 |
02:32:01.42 |
+18:07:48.3 |
HIP 11781 |
14.62 |
| 2026-08-01 12:00 |
02:32:09.47 |
+18:08:43.8 |
HIP 11781 |
13.78 |
| 2026-08-02 00:00 |
02:32:17.34 |
+18:09:38.5 |
HIP 11781 |
13.23 |
| 2026-08-02 12:00 |
02:32:25.03 |
+18:10:32.4 |
HIP 11781 |
12.99 |
| 2026-08-03 00:00 |
02:32:32.53 |
+18:11:25.5 |
HIP 11781 |
13.05 |
| 2026-08-03 12:00 |
02:32:39.86 |
+18:12:17.7 |
HIP 11781 |
13.40 |
| 2026-08-04 00:00 |
02:32:47.00 |
+18:13:09.2 |
HIP 11781 |
13.98 |
| 2026-08-04 12:00 |
02:32:53.95 |
+18:13:59.8 |
HIP 11781 |
14.76 |
| 2026-08-05 00:00 |
02:33:00.72 |
+18:14:49.6 |
HIP 11781 |
15.68 |
| 2026-08-05 12:00 |
02:33:07.31 |
+18:15:38.5 |
HIP 11781 |
16.72 |
| 2026-08-06 00:00 |
02:33:13.70 |
+18:16:26.6 |
HIP 11781 |
17.83 |
| 2026-08-06 12:00 |
02:33:19.90 |
+18:17:13.9 |
HIP 11781 |
19.00 |
| 2026-08-07 00:00 |
02:33:25.92 |
+18:18:00.3 |
HIP 11781 |
20.19 |
| 2026-08-07 12:00 |
02:33:31.74 |
+18:18:45.9 |
HIP 11781 |
21.39 |
| 2026-08-08 00:00 |
02:33:37.36 |
+18:19:30.6 |
HIP 11781 |
22.60 |
| 2026-08-08 12:00 |
02:33:42.79 |
+18:20:14.4 |
HIP 11781 |
23.80 |
| 2026-08-09 00:00 |
02:33:48.03 |
+18:20:57.3 |
HIP 11781 |
24.99 |
| 2026-08-09 12:00 |
02:33:53.07 |
+18:21:39.4 |
HIP 12024 |
24.77 |
| 2026-08-10 00:00 |
02:33:57.91 |
+18:22:20.6 |
HIP 12024 |
24.52 |
| 2026-08-10 12:00 |
02:34:02.55 |
+18:23:00.9 |
HIP 12024 |
24.36 |
| 2026-08-11 00:00 |
02:34:06.99 |
+18:23:40.3 |
HIP 12024 |
24.28 |
| 2026-08-11 12:00 |
02:34:11.23 |
+18:24:18.8 |
HIP 12024 |
24.27 |
| 2026-08-12 00:00 |
02:34:15.26 |
+18:24:56.4 |
HIP 12024 |
24.33 |
| 2026-08-12 12:00 |
02:34:19.09 |
+18:25:33.1 |
HIP 12024 |
24.46 |
| 2026-08-13 00:00 |
02:34:22.72 |
+18:26:08.9 |
HIP 12024 |
24.64 |
| 2026-08-13 12:00 |
02:34:26.14 |
+18:26:43.7 |
HIP 12024 |
24.86 |
| 2026-08-14 00:00 |
02:34:29.35 |
+18:27:17.6 |
HIP 12024 |
25.12 |
| 2026-08-14 12:00 |
02:34:32.36 |
+18:27:50.6 |
HIP 12024 |
25.42 |
| 2026-08-15 00:00 |
02:34:35.16 |
+18:28:22.7 |
HIP 12024 |
25.74 |
| 2026-08-15 12:00 |
02:34:37.75 |
+18:28:53.8 |
HIP 12024 |
26.09 |
| 2026-08-16 00:00 |
02:34:40.13 |
+18:29:24.0 |
HIP 12024 |
26.45 |
| 2026-08-16 12:00 |
02:34:42.30 |
+18:29:53.2 |
HIP 12024 |
26.82 |
| 2026-08-17 00:00 |
02:34:44.25 |
+18:30:21.5 |
HIP 12024 |
27.19 |
| 2026-08-17 12:00 |
02:34:46.00 |
+18:30:48.8 |
HIP 11904 |
27.47 |
| 2026-08-18 00:00 |
02:34:47.53 |
+18:31:15.1 |
HIP 11904 |
27.34 |
| 2026-08-18 12:00 |
02:34:48.84 |
+18:31:40.5 |
HIP 11904 |
27.20 |
| 2026-08-19 00:00 |
02:34:49.95 |
+18:32:04.9 |
HIP 11904 |
27.05 |