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) |
| 2026-06-01 00:00 |
00:43:07.00 |
-04:18:37.1 |
HIP 3465 |
18.86 |
| 2026-06-01 12:00 |
00:43:31.96 |
-04:16:40.9 |
HIP 3465 |
13.92 |
| 2026-06-02 00:00 |
00:43:56.83 |
-04:14:45.6 |
HIP 3465 |
10.79 |
| 2026-06-02 12:00 |
00:44:21.62 |
-04:12:51.2 |
HIP 3465 |
11.10 |
| 2026-06-03 00:00 |
00:44:46.32 |
-04:10:57.7 |
HIP 3465 |
14.59 |
| 2026-06-03 12:00 |
00:45:10.94 |
-04:09:05.1 |
HIP 3465 |
19.61 |
| 2026-06-04 00:00 |
00:45:35.46 |
-04:07:13.4 |
HIP 3645 |
24.50 |
| 2026-06-04 12:00 |
00:45:59.90 |
-04:05:22.7 |
HIP 3645 |
22.60 |
| 2026-06-05 00:00 |
00:46:24.25 |
-04:03:32.9 |
HIP 3645 |
22.41 |
| 2026-06-05 12:00 |
00:46:48.51 |
-04:01:44.0 |
HIP 3645 |
23.93 |
| 2026-06-06 00:00 |
00:47:12.67 |
-03:59:56.1 |
HIP 3746 |
21.44 |
| 2026-06-06 12:00 |
00:47:36.74 |
-03:58:09.1 |
HIP 3746 |
16.85 |
| 2026-06-07 00:00 |
00:48:00.72 |
-03:56:23.1 |
HIP 3746 |
13.69 |
| 2026-06-07 12:00 |
00:48:24.61 |
-03:54:38.0 |
HIP 3746 |
12.99 |
| 2026-06-08 00:00 |
00:48:48.39 |
-03:52:54.0 |
HIP 3746 |
15.06 |
| 2026-06-08 12:00 |
00:49:12.08 |
-03:51:10.8 |
HIP 3746 |
19.00 |
| 2026-06-09 00:00 |
00:49:35.68 |
-03:49:28.7 |
HIP 3746 |
23.87 |
| 2026-06-09 12:00 |
00:49:59.17 |
-03:47:47.6 |
HIP 3746 |
29.20 |
| 2026-06-10 00:00 |
00:50:22.57 |
-03:46:07.5 |
HIP 4040 |
28.77 |
| 2026-06-10 12:00 |
00:50:45.86 |
-03:44:28.4 |
HIP 4040 |
26.02 |
| 2026-06-11 00:00 |
00:51:09.06 |
-03:42:50.3 |
HIP 4040 |
24.47 |
| 2026-06-11 12:00 |
00:51:32.14 |
-03:41:13.2 |
HIP 4040 |
24.33 |
| 2026-06-12 00:00 |
00:51:55.13 |
-03:39:37.1 |
HIP 4040 |
25.62 |
| 2026-06-12 12:00 |
00:52:18.01 |
-03:38:02.1 |
HIP 4040 |
28.10 |
| 2026-06-13 00:00 |
00:52:40.78 |
-03:36:28.2 |
HIP 4040 |
31.49 |
| 2026-06-13 12:00 |
00:53:03.45 |
-03:34:55.2 |
HIP 4021 |
34.74 |
| 2026-06-14 00:00 |
00:53:26.00 |
-03:33:23.4 |
HIP 4021 |
37.62 |
| 2026-06-14 12:00 |
00:53:48.45 |
-03:31:52.6 |
HIP 4374 |
35.59 |
| 2026-06-15 00:00 |
00:54:10.78 |
-03:30:22.9 |
HIP 4374 |
31.07 |
| 2026-06-15 12:00 |
00:54:33.00 |
-03:28:54.2 |
HIP 4374 |
27.04 |
| 2026-06-16 00:00 |
00:54:55.11 |
-03:27:26.7 |
HIP 4374 |
23.73 |
| 2026-06-16 12:00 |
00:55:17.11 |
-03:26:00.2 |
HIP 4374 |
21.45 |
| 2026-06-17 00:00 |
00:55:38.98 |
-03:24:34.8 |
HIP 4374 |
20.53 |
| 2026-06-17 12:00 |
00:56:00.75 |
-03:23:10.5 |
HIP 4374 |
21.11 |
| 2026-06-18 00:00 |
00:56:22.39 |
-03:21:47.3 |
HIP 4374 |
23.05 |
| 2026-06-18 12:00 |
00:56:43.92 |
-03:20:25.3 |
HIP 4374 |
26.03 |
| 2026-06-19 00:00 |
00:57:05.32 |
-03:19:04.3 |
HIP 4374 |
29.73 |
| 2026-06-19 12:00 |
00:57:26.61 |
-03:17:44.5 |
HIP 4374 |
33.89 |
| 2026-06-20 00:00 |
00:57:47.77 |
-03:16:25.8 |
HIP 4439 |
36.01 |
| 2026-06-20 12:00 |
00:58:08.81 |
-03:15:08.2 |
HIP 4439 |
37.43 |
| 2026-06-21 00:00 |
00:58:29.73 |
-03:13:51.8 |
HIP 4439 |
39.55 |
| 2026-06-21 12:00 |
00:58:50.52 |
-03:12:36.5 |
HIP 4549 |
39.33 |
| 2026-06-22 00:00 |
00:59:11.19 |
-03:11:22.3 |
HIP 4549 |
39.73 |