メタデータ
| 項目 |
値 |
| Designation |
293P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-01-10T06:55:08.644800Z |
| Orbit solution date (soln_date, UTC) |
2022-06-12T21:06:40Z |
| Obs used |
463 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
7.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-01-02.0000000 |
| e |
0.41974111 |
| q (au) |
2.111752 |
| a (au) |
3.639328 |
| i (deg) |
9.064844 |
| Ω (om, deg) |
78.437790 |
| ω (w, deg) |
41.152848 |
| M (ma, deg) |
358.823377 |
等級
散乱 + 全体線形
$$
M_a = (15.488 + 2.988\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.488 |
| n |
2.988 |
| gf |
1.000 |
| gb |
-0.716 |
| k |
0.994 |
| 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
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) |
| 2026-09-25 00:00 |
01:04:19.42 |
-05:54:29.2 |
HIP 4948 |
14.11 |
| 2026-09-25 12:00 |
01:03:58.97 |
-05:56:49.3 |
HIP 4948 |
11.27 |
| 2026-09-26 00:00 |
01:03:38.37 |
-05:59:08.9 |
HIP 4948 |
10.82 |
| 2026-09-26 12:00 |
01:03:17.63 |
-06:01:28.2 |
HIP 4948 |
13.06 |
| 2026-09-27 00:00 |
01:02:56.75 |
-06:03:47.0 |
HIP 4948 |
16.98 |
| 2026-09-27 12:00 |
01:02:35.74 |
-06:06:05.3 |
HIP 4948 |
21.71 |
| 2026-09-28 00:00 |
01:02:14.59 |
-06:08:23.1 |
HIP 4948 |
26.84 |
| 2026-09-28 12:00 |
01:01:53.31 |
-06:10:40.4 |
HIP 4948 |
32.19 |
| 2026-09-29 00:00 |
01:01:31.91 |
-06:12:57.1 |
HIP 4796 |
35.02 |
| 2026-09-29 12:00 |
01:01:10.39 |
-06:15:13.2 |
HIP 4796 |
33.29 |
| 2026-09-30 00:00 |
01:00:48.75 |
-06:17:28.7 |
HIP 4796 |
32.52 |
| 2026-09-30 12:00 |
01:00:27.01 |
-06:19:43.5 |
HIP 4796 |
32.82 |
| 2026-10-01 00:00 |
01:00:05.15 |
-06:21:57.5 |
HIP 4796 |
34.16 |
| 2026-10-01 12:00 |
00:59:43.20 |
-06:24:10.8 |
HIP 4592 |
34.33 |
| 2026-10-02 00:00 |
00:59:21.15 |
-06:26:23.4 |
HIP 4592 |
34.57 |
| 2026-10-02 12:00 |
00:58:59.00 |
-06:28:35.1 |
HIP 4474 |
33.25 |
| 2026-10-03 00:00 |
00:58:36.77 |
-06:30:46.0 |
HIP 4474 |
31.00 |
| 2026-10-03 12:00 |
00:58:14.45 |
-06:32:55.9 |
HIP 4403 |
28.37 |
| 2026-10-04 00:00 |
00:57:52.05 |
-06:35:05.0 |
HIP 4403 |
22.40 |
| 2026-10-04 12:00 |
00:57:29.58 |
-06:37:13.1 |
HIP 4403 |
16.43 |
| 2026-10-05 00:00 |
00:57:07.05 |
-06:39:20.1 |
HIP 4403 |
10.44 |
| 2026-10-05 12:00 |
00:56:44.44 |
-06:41:26.2 |
HIP 4403 |
4.46 |
| 2026-10-06 00:00 |
00:56:21.78 |
-06:43:31.2 |
HIP 4403 |
1.58 |
| 2026-10-06 12:00 |
00:55:59.07 |
-06:45:35.0 |
HIP 4403 |
7.56 |
| 2026-10-07 00:00 |
00:55:36.31 |
-06:47:37.8 |
HIP 4403 |
13.57 |
| 2026-10-07 12:00 |
00:55:13.50 |
-06:49:39.3 |
HIP 4403 |
19.58 |
| 2026-10-08 00:00 |
00:54:50.66 |
-06:51:39.7 |
HIP 4276 |
22.71 |
| 2026-10-08 12:00 |
00:54:27.79 |
-06:53:38.8 |
HIP 4276 |
21.01 |
| 2026-10-09 00:00 |
00:54:04.89 |
-06:55:36.6 |
HIP 4276 |
20.99 |
| 2026-10-09 12:00 |
00:53:41.97 |
-06:57:33.1 |
HIP 4276 |
22.64 |
| 2026-10-10 00:00 |
00:53:19.04 |
-06:59:28.2 |
HIP 4054 |
22.39 |
| 2026-10-10 12:00 |
00:52:56.09 |
-07:01:21.9 |
HIP 4054 |
16.40 |
| 2026-10-11 00:00 |
00:52:33.14 |
-07:03:14.3 |
HIP 4054 |
10.43 |
| 2026-10-11 12:00 |
00:52:10.19 |
-07:05:05.1 |
HIP 4054 |
4.52 |
| 2026-10-12 00:00 |
00:51:47.25 |
-07:06:54.5 |
HIP 4054 |
1.96 |
| 2026-10-12 12:00 |
00:51:24.32 |
-07:08:42.4 |
HIP 4054 |
7.65 |
| 2026-10-13 00:00 |
00:51:01.41 |
-07:10:28.7 |
HIP 4054 |
13.57 |
| 2026-10-13 12:00 |
00:50:38.52 |
-07:12:13.4 |
HIP 4054 |
19.50 |
| 2026-10-14 00:00 |
00:50:15.66 |
-07:13:56.6 |
HIP 4054 |
25.41 |
| 2026-10-14 12:00 |
00:49:52.84 |
-07:15:38.1 |
HIP 4054 |
31.32 |
| 2026-10-15 00:00 |
00:49:30.06 |
-07:17:17.9 |
HIP 3874 |
33.85 |
| 2026-10-15 12:00 |
00:49:07.32 |
-07:18:56.0 |
HIP 3874 |
33.32 |
| 2026-10-16 00:00 |
00:48:44.63 |
-07:20:32.5 |
HIP 3874 |
33.83 |