メタデータ
| 項目 |
値 |
| Designation |
283P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-04-06T23:45:57.098880Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:14:11Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
16.700 |
| 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) |
2012-03-13.0000000 |
| e |
0.48567912 |
| q (au) |
2.126445 |
| a (au) |
4.134471 |
| i (deg) |
14.464365 |
| Ω (om, deg) |
161.248171 |
| ω (w, deg) |
21.995380 |
| M (ma, deg) |
314.277725 |
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) |
| 2026-03-26 00:00 |
00:38:10.33 |
-02:11:32.7 |
HIP 3090 |
21.79 |
| 2026-03-26 12:00 |
00:38:30.40 |
-02:09:39.5 |
HIP 3090 |
16.77 |
| 2026-03-27 00:00 |
00:38:50.47 |
-02:07:46.4 |
HIP 3090 |
12.03 |
| 2026-03-27 12:00 |
00:39:10.55 |
-02:05:53.5 |
HIP 3090 |
8.11 |
| 2026-03-28 00:00 |
00:39:30.64 |
-02:04:00.8 |
HIP 3090 |
6.65 |
| 2026-03-28 12:00 |
00:39:50.73 |
-02:02:08.2 |
HIP 3090 |
8.95 |
| 2026-03-29 00:00 |
00:40:10.83 |
-02:00:15.8 |
HIP 3090 |
13.17 |
| 2026-03-29 12:00 |
00:40:30.94 |
-01:58:23.6 |
HIP 3183 |
12.15 |
| 2026-03-30 00:00 |
00:40:51.05 |
-01:56:31.6 |
HIP 3183 |
11.29 |
| 2026-03-30 12:00 |
00:41:11.17 |
-01:54:39.8 |
HIP 3183 |
12.85 |
| 2026-03-31 00:00 |
00:41:31.29 |
-01:52:48.1 |
HIP 3183 |
16.13 |
| 2026-03-31 12:00 |
00:41:51.41 |
-01:50:56.7 |
HIP 3183 |
20.32 |
| 2026-04-01 00:00 |
00:42:11.54 |
-01:49:05.5 |
HIP 3183 |
24.96 |
| 2026-04-01 12:00 |
00:42:31.67 |
-01:47:14.4 |
HIP 3439 |
27.27 |
| 2026-04-02 00:00 |
00:42:51.80 |
-01:45:23.6 |
HIP 3439 |
22.40 |
| 2026-04-02 12:00 |
00:43:11.93 |
-01:43:32.9 |
HIP 3439 |
17.80 |
| 2026-04-03 00:00 |
00:43:32.07 |
-01:41:42.5 |
HIP 3439 |
13.78 |
| 2026-04-03 12:00 |
00:43:52.20 |
-01:39:52.3 |
HIP 3439 |
10.96 |
| 2026-04-04 00:00 |
00:44:12.34 |
-01:38:02.4 |
HIP 3439 |
10.39 |
| 2026-04-04 12:00 |
00:44:32.47 |
-01:36:12.6 |
HIP 3439 |
12.38 |
| 2026-04-05 00:00 |
00:44:52.61 |
-01:34:23.1 |
HIP 3439 |
15.99 |
| 2026-04-05 12:00 |
00:45:12.74 |
-01:32:33.8 |
HIP 3439 |
20.39 |
| 2026-04-06 00:00 |
00:45:32.87 |
-01:30:44.8 |
HIP 3582 |
19.88 |
| 2026-04-06 12:00 |
00:45:53.00 |
-01:28:55.9 |
HIP 3582 |
17.96 |
| 2026-04-07 00:00 |
00:46:13.13 |
-01:27:07.4 |
HIP 3674 |
16.95 |
| 2026-04-07 12:00 |
00:46:33.25 |
-01:25:19.1 |
HIP 3674 |
12.33 |
| 2026-04-08 00:00 |
00:46:53.37 |
-01:23:31.0 |
HIP 3674 |
8.59 |
| 2026-04-08 12:00 |
00:47:13.48 |
-01:21:43.2 |
HIP 3674 |
7.26 |
| 2026-04-09 00:00 |
00:47:33.59 |
-01:19:55.7 |
HIP 3674 |
9.42 |
| 2026-04-09 12:00 |
00:47:53.69 |
-01:18:08.4 |
HIP 3789 |
12.93 |
| 2026-04-10 00:00 |
00:48:13.78 |
-01:16:21.4 |
HIP 3789 |
9.63 |
| 2026-04-10 12:00 |
00:48:33.87 |
-01:14:34.7 |
HIP 3789 |
8.68 |
| 2026-04-11 00:00 |
00:48:53.95 |
-01:12:48.3 |
HIP 3789 |
10.70 |
| 2026-04-11 12:00 |
00:49:14.03 |
-01:11:02.1 |
HIP 3789 |
14.49 |
| 2026-04-12 00:00 |
00:49:34.09 |
-01:09:16.3 |
HIP 3789 |
19.03 |
| 2026-04-12 12:00 |
00:49:54.15 |
-01:07:30.7 |
HIP 3789 |
23.88 |
| 2026-04-13 00:00 |
00:50:14.19 |
-01:05:45.5 |
HIP 4013 |
21.67 |
| 2026-04-13 12:00 |
00:50:34.23 |
-01:04:00.5 |
HIP 4013 |
18.77 |
| 2026-04-14 00:00 |
00:50:54.25 |
-01:02:15.8 |
HIP 4013 |
17.06 |
| 2026-04-14 12:00 |
00:51:14.26 |
-01:00:31.5 |
HIP 4013 |
16.90 |
| 2026-04-15 00:00 |
00:51:34.26 |
-00:58:47.5 |
HIP 4013 |
18.34 |
| 2026-04-15 12:00 |
00:51:54.25 |
-00:57:03.8 |
HIP 4147 |
20.21 |
| 2026-04-16 00:00 |
00:52:14.22 |
-00:55:20.4 |
HIP 4147 |
17.63 |