メタデータ
| 項目 |
値 |
| Designation |
C/2003 K1 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-12-21T03:39:15.825600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:30Z |
| Obs used |
52 |
| NEO |
- |
| M1 |
14.100 |
| K1 |
8.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-05-30.0000000 |
| e |
0.95010346 |
| q (au) |
2.087130 |
| a (au) |
41.829157 |
| i (deg) |
129.831395 |
| Ω (om, deg) |
250.055839 |
| ω (w, deg) |
314.475766 |
| M (ma, deg) |
0.582360 |
等級
散乱 + 全体線形
$$
M_a = (14.875 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.875 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
09:37:33.85 |
+62:05:09.1 |
HIP 47402 |
13.36 |
| 2026-03-26 12:00 |
09:37:28.87 |
+62:04:53.0 |
HIP 47402 |
13.95 |
| 2026-03-27 00:00 |
09:37:23.92 |
+62:04:36.7 |
HIP 47402 |
14.54 |
| 2026-03-27 12:00 |
09:37:19.01 |
+62:04:20.1 |
HIP 47402 |
15.13 |
| 2026-03-28 00:00 |
09:37:14.15 |
+62:04:03.2 |
HIP 47402 |
15.72 |
| 2026-03-28 12:00 |
09:37:09.33 |
+62:03:46.1 |
HIP 47402 |
16.31 |
| 2026-03-29 00:00 |
09:37:04.55 |
+62:03:28.6 |
HIP 47402 |
16.90 |
| 2026-03-29 12:00 |
09:36:59.81 |
+62:03:10.9 |
HIP 47402 |
17.48 |
| 2026-03-30 00:00 |
09:36:55.11 |
+62:02:53.0 |
HIP 47402 |
18.07 |
| 2026-03-30 12:00 |
09:36:50.46 |
+62:02:34.7 |
HIP 47402 |
18.65 |
| 2026-03-31 00:00 |
09:36:45.85 |
+62:02:16.2 |
HIP 47402 |
19.23 |
| 2026-03-31 12:00 |
09:36:41.28 |
+62:01:57.5 |
HIP 47402 |
19.81 |
| 2026-04-01 00:00 |
09:36:36.76 |
+62:01:38.4 |
HIP 47402 |
20.39 |
| 2026-04-01 12:00 |
09:36:32.28 |
+62:01:19.1 |
HIP 47402 |
20.96 |
| 2026-04-02 00:00 |
09:36:27.84 |
+62:00:59.6 |
HIP 47402 |
21.54 |
| 2026-04-02 12:00 |
09:36:23.45 |
+62:00:39.8 |
HIP 47402 |
22.11 |
| 2026-04-03 00:00 |
09:36:19.11 |
+62:00:19.7 |
HIP 47402 |
22.68 |
| 2026-04-03 12:00 |
09:36:14.81 |
+61:59:59.4 |
HIP 47402 |
23.25 |
| 2026-04-04 00:00 |
09:36:10.55 |
+61:59:38.8 |
HIP 47402 |
23.82 |
| 2026-04-04 12:00 |
09:36:06.34 |
+61:59:18.0 |
HIP 47402 |
24.38 |
| 2026-04-05 00:00 |
09:36:02.17 |
+61:58:57.0 |
HIP 46829 |
24.57 |
| 2026-04-05 12:00 |
09:35:58.05 |
+61:58:35.7 |
HIP 46829 |
24.07 |
| 2026-04-06 00:00 |
09:35:53.98 |
+61:58:14.1 |
HIP 46829 |
23.58 |
| 2026-04-06 12:00 |
09:35:49.95 |
+61:57:52.3 |
HIP 46829 |
23.11 |
| 2026-04-07 00:00 |
09:35:45.97 |
+61:57:30.3 |
HIP 46829 |
22.64 |
| 2026-04-07 12:00 |
09:35:42.04 |
+61:57:08.0 |
HIP 46829 |
22.19 |
| 2026-04-08 00:00 |
09:35:38.16 |
+61:56:45.5 |
HIP 46829 |
21.74 |
| 2026-04-08 12:00 |
09:35:34.32 |
+61:56:22.8 |
HIP 46829 |
21.32 |
| 2026-04-09 00:00 |
09:35:30.52 |
+61:55:59.8 |
HIP 46829 |
20.90 |
| 2026-04-09 12:00 |
09:35:26.78 |
+61:55:36.6 |
HIP 46829 |
20.50 |
| 2026-04-10 00:00 |
09:35:23.09 |
+61:55:13.2 |
HIP 46829 |
20.11 |
| 2026-04-10 12:00 |
09:35:19.44 |
+61:54:49.5 |
HIP 46829 |
19.74 |
| 2026-04-11 00:00 |
09:35:15.84 |
+61:54:25.7 |
HIP 46829 |
19.39 |
| 2026-04-11 12:00 |
09:35:12.29 |
+61:54:01.6 |
HIP 46829 |
19.05 |
| 2026-04-12 00:00 |
09:35:08.79 |
+61:53:37.3 |
HIP 46829 |
18.73 |
| 2026-04-12 12:00 |
09:35:05.33 |
+61:53:12.7 |
HIP 46829 |
18.43 |
| 2026-04-13 00:00 |
09:35:01.93 |
+61:52:48.0 |
HIP 46829 |
18.15 |
| 2026-04-13 12:00 |
09:34:58.58 |
+61:52:23.0 |
HIP 46829 |
17.89 |
| 2026-04-14 00:00 |
09:34:55.27 |
+61:51:57.9 |
HIP 46829 |
17.65 |
| 2026-04-14 12:00 |
09:34:52.02 |
+61:51:32.5 |
HIP 46829 |
17.44 |
| 2026-04-15 00:00 |
09:34:48.81 |
+61:51:06.9 |
HIP 46829 |
17.25 |
| 2026-04-15 12:00 |
09:34:45.66 |
+61:50:41.1 |
HIP 46829 |
17.08 |
| 2026-04-16 00:00 |
09:34:42.55 |
+61:50:15.1 |
HIP 46829 |
16.93 |