メタデータ
| 項目 |
値 |
| Designation |
P/2007 S1 (Zhao) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-12-06T20:05:23.029440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:12Z |
| Obs used |
78 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-09-29.0000000 |
| e |
0.34338434 |
| q (au) |
2.494391 |
| a (au) |
3.798860 |
| i (deg) |
5.973039 |
| Ω (om, deg) |
141.618584 |
| ω (w, deg) |
245.425020 |
| M (ma, deg) |
350.836814 |
等級
散乱 + 全体線形
$$
M_a = (10.850 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.850 |
| n |
6.000 |
| gf |
0.876 |
| gb |
-0.879 |
| k |
1.000 |
| δ90 |
3.511 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
13:12:47.98 |
-02:01:19.9 |
HIP 64457 |
14.61 |
| 2026-07-29 12:00 |
13:13:01.10 |
-02:03:03.9 |
HIP 64457 |
13.54 |
| 2026-07-30 00:00 |
13:13:14.35 |
-02:04:48.5 |
HIP 64457 |
13.46 |
| 2026-07-30 12:00 |
13:13:27.72 |
-02:06:33.7 |
HIP 64457 |
14.40 |
| 2026-07-31 00:00 |
13:13:41.22 |
-02:08:19.5 |
HIP 64457 |
16.21 |
| 2026-07-31 12:00 |
13:13:54.85 |
-02:10:06.0 |
HIP 64457 |
18.66 |
| 2026-08-01 00:00 |
13:14:08.59 |
-02:11:53.0 |
HIP 64457 |
21.54 |
| 2026-08-01 12:00 |
13:14:22.47 |
-02:13:40.6 |
HIP 64457 |
24.73 |
| 2026-08-02 00:00 |
13:14:36.46 |
-02:15:28.8 |
HIP 64498 |
27.30 |
| 2026-08-02 12:00 |
13:14:50.57 |
-02:17:17.5 |
HIP 64498 |
29.01 |
| 2026-08-03 00:00 |
13:15:04.81 |
-02:19:06.9 |
HIP 64498 |
31.16 |
| 2026-08-03 12:00 |
13:15:19.17 |
-02:20:56.8 |
HIP 64569 |
33.22 |
| 2026-08-04 00:00 |
13:15:33.64 |
-02:22:47.2 |
HIP 64569 |
33.97 |
| 2026-08-04 12:00 |
13:15:48.24 |
-02:24:38.3 |
HIP 64569 |
35.19 |
| 2026-08-05 00:00 |
13:16:02.95 |
-02:26:29.8 |
HIP 64569 |
36.84 |
| 2026-08-05 12:00 |
13:16:17.79 |
-02:28:22.0 |
HIP 64721 |
38.72 |
| 2026-08-06 00:00 |
13:16:32.74 |
-02:30:14.6 |
HIP 64963 |
35.62 |
| 2026-08-06 12:00 |
13:16:47.80 |
-02:32:07.8 |
HIP 64963 |
31.82 |
| 2026-08-07 00:00 |
13:17:02.99 |
-02:34:01.6 |
HIP 64963 |
28.11 |
| 2026-08-07 12:00 |
13:17:18.29 |
-02:35:55.8 |
HIP 64963 |
24.54 |
| 2026-08-08 00:00 |
13:17:33.70 |
-02:37:50.6 |
HIP 64963 |
21.21 |
| 2026-08-08 12:00 |
13:17:49.23 |
-02:39:45.9 |
HIP 64963 |
18.27 |
| 2026-08-09 00:00 |
13:18:04.87 |
-02:41:41.7 |
HIP 64963 |
15.95 |
| 2026-08-09 12:00 |
13:18:20.62 |
-02:43:38.0 |
HIP 64963 |
14.58 |
| 2026-08-10 00:00 |
13:18:36.49 |
-02:45:34.8 |
HIP 64963 |
14.47 |
| 2026-08-10 12:00 |
13:18:52.47 |
-02:47:32.1 |
HIP 64963 |
15.66 |
| 2026-08-11 00:00 |
13:19:08.56 |
-02:49:29.9 |
HIP 64965 |
15.06 |
| 2026-08-11 12:00 |
13:19:24.76 |
-02:51:28.1 |
HIP 64965 |
14.56 |
| 2026-08-12 00:00 |
13:19:41.07 |
-02:53:26.9 |
HIP 65081 |
13.44 |
| 2026-08-12 12:00 |
13:19:57.49 |
-02:55:26.1 |
HIP 65081 |
9.03 |
| 2026-08-13 00:00 |
13:20:14.02 |
-02:57:25.7 |
HIP 65081 |
4.88 |
| 2026-08-13 12:00 |
13:20:30.65 |
-02:59:25.8 |
HIP 65081 |
2.84 |
| 2026-08-14 00:00 |
13:20:47.39 |
-03:01:26.4 |
HIP 65081 |
5.93 |
| 2026-08-14 12:00 |
13:21:04.24 |
-03:03:27.4 |
HIP 65081 |
10.29 |
| 2026-08-15 00:00 |
13:21:21.19 |
-03:05:28.8 |
HIP 65081 |
14.86 |
| 2026-08-15 12:00 |
13:21:38.24 |
-03:07:30.7 |
HIP 65081 |
19.51 |
| 2026-08-16 00:00 |
13:21:55.40 |
-03:09:33.0 |
HIP 65081 |
24.22 |
| 2026-08-16 12:00 |
13:22:12.67 |
-03:11:35.7 |
HIP 65081 |
28.96 |
| 2026-08-17 00:00 |
13:22:30.03 |
-03:13:38.8 |
HIP 65081 |
33.74 |
| 2026-08-17 12:00 |
13:22:47.49 |
-03:15:42.3 |
HIP 65081 |
38.55 |
| 2026-08-18 00:00 |
13:23:05.06 |
-03:17:46.2 |
HIP 65335 |
42.18 |
| 2026-08-18 12:00 |
13:23:22.72 |
-03:19:50.5 |
HIP 65335 |
39.76 |
| 2026-08-19 00:00 |
13:23:40.49 |
-03:21:55.1 |
HIP 65531 |
35.33 |