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) |
| 2026-06-01 00:00 |
01:58:43.66 |
+14:54:34.5 |
HIP 9286 |
19.22 |
| 2026-06-01 12:00 |
01:59:05.79 |
+14:56:40.0 |
HIP 9286 |
19.45 |
| 2026-06-02 00:00 |
01:59:27.87 |
+14:58:45.1 |
HIP 9301 |
17.69 |
| 2026-06-02 12:00 |
01:59:49.89 |
+15:00:49.9 |
HIP 9301 |
16.13 |
| 2026-06-03 00:00 |
02:00:11.84 |
+15:02:54.3 |
HIP 9301 |
16.50 |
| 2026-06-03 12:00 |
02:00:33.73 |
+15:04:58.3 |
HIP 9470 |
18.53 |
| 2026-06-04 00:00 |
02:00:55.56 |
+15:07:01.9 |
HIP 9470 |
13.57 |
| 2026-06-04 12:00 |
02:01:17.33 |
+15:09:05.2 |
HIP 9470 |
9.45 |
| 2026-06-05 00:00 |
02:01:39.03 |
+15:11:08.0 |
HIP 9470 |
7.62 |
| 2026-06-05 12:00 |
02:02:00.67 |
+15:13:10.5 |
HIP 9470 |
9.48 |
| 2026-06-06 00:00 |
02:02:22.24 |
+15:15:12.6 |
HIP 9470 |
13.57 |
| 2026-06-06 12:00 |
02:02:43.75 |
+15:17:14.2 |
HIP 9522 |
12.98 |
| 2026-06-07 00:00 |
02:03:05.19 |
+15:19:15.5 |
HIP 9522 |
13.61 |
| 2026-06-07 12:00 |
02:03:26.56 |
+15:21:16.3 |
HIP 9522 |
16.23 |
| 2026-06-08 00:00 |
02:03:47.86 |
+15:23:16.8 |
HIP 9522 |
20.05 |
| 2026-06-08 12:00 |
02:04:09.09 |
+15:25:16.8 |
HIP 9522 |
24.51 |
| 2026-06-09 00:00 |
02:04:30.25 |
+15:27:16.4 |
HIP 9522 |
29.30 |
| 2026-06-09 12:00 |
02:04:51.34 |
+15:29:15.6 |
HIP 9758 |
28.06 |
| 2026-06-10 00:00 |
02:05:12.36 |
+15:31:14.3 |
HIP 9758 |
24.88 |
| 2026-06-10 12:00 |
02:05:33.30 |
+15:33:12.7 |
HIP 9758 |
22.59 |
| 2026-06-11 00:00 |
02:05:54.17 |
+15:35:10.6 |
HIP 9758 |
21.45 |
| 2026-06-11 12:00 |
02:06:14.96 |
+15:37:08.0 |
HIP 9912 |
19.22 |
| 2026-06-12 00:00 |
02:06:35.68 |
+15:39:05.1 |
HIP 9912 |
14.63 |
| 2026-06-12 12:00 |
02:06:56.32 |
+15:41:01.6 |
HIP 9912 |
10.77 |
| 2026-06-13 00:00 |
02:07:16.88 |
+15:42:57.8 |
HIP 9912 |
8.67 |
| 2026-06-13 12:00 |
02:07:37.37 |
+15:44:53.5 |
HIP 9948 |
7.23 |
| 2026-06-14 00:00 |
02:07:57.77 |
+15:46:48.7 |
HIP 9948 |
2.08 |
| 2026-06-14 12:00 |
02:08:18.09 |
+15:48:43.5 |
HIP 9948 |
3.44 |
| 2026-06-15 00:00 |
02:08:38.34 |
+15:50:37.8 |
HIP 9948 |
8.61 |
| 2026-06-15 12:00 |
02:08:58.49 |
+15:52:31.6 |
HIP 9948 |
13.80 |
| 2026-06-16 00:00 |
02:09:18.57 |
+15:54:25.0 |
HIP 9948 |
18.97 |
| 2026-06-16 12:00 |
02:09:38.56 |
+15:56:17.9 |
HIP 9948 |
24.13 |
| 2026-06-17 00:00 |
02:09:58.46 |
+15:58:10.3 |
HIP 10207 |
19.33 |
| 2026-06-17 12:00 |
02:10:18.28 |
+16:00:02.2 |
HIP 10207 |
14.71 |
| 2026-06-18 00:00 |
02:10:38.00 |
+16:01:53.7 |
HIP 10207 |
10.56 |
| 2026-06-18 12:00 |
02:10:57.64 |
+16:03:44.7 |
HIP 10207 |
7.68 |
| 2026-06-19 00:00 |
02:11:17.20 |
+16:05:35.2 |
HIP 10207 |
7.59 |
| 2026-06-19 12:00 |
02:11:36.66 |
+16:07:25.2 |
HIP 10207 |
10.33 |
| 2026-06-20 00:00 |
02:11:56.03 |
+16:09:14.6 |
HIP 10207 |
14.35 |
| 2026-06-20 12:00 |
02:12:15.30 |
+16:11:03.6 |
HIP 10330 |
13.35 |
| 2026-06-21 00:00 |
02:12:34.49 |
+16:12:52.1 |
HIP 10330 |
10.67 |
| 2026-06-21 12:00 |
02:12:53.58 |
+16:14:40.1 |
HIP 10330 |
9.93 |
| 2026-06-22 00:00 |
02:13:12.58 |
+16:16:27.6 |
HIP 10330 |
11.47 |