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) |
| 2026-09-20 00:00 |
09:49:34.91 |
+59:57:15.2 |
HIP 48140 |
10.23 |
| 2026-09-20 12:00 |
09:49:39.33 |
+59:57:24.5 |
HIP 48140 |
10.42 |
| 2026-09-21 00:00 |
09:49:43.72 |
+59:57:34.0 |
HIP 48140 |
10.63 |
| 2026-09-21 12:00 |
09:49:48.09 |
+59:57:43.8 |
HIP 48140 |
10.86 |
| 2026-09-22 00:00 |
09:49:52.43 |
+59:57:53.9 |
HIP 48140 |
11.11 |
| 2026-09-22 12:00 |
09:49:56.75 |
+59:58:04.2 |
HIP 48140 |
11.37 |
| 2026-09-23 00:00 |
09:50:01.04 |
+59:58:14.8 |
HIP 48140 |
11.65 |
| 2026-09-23 12:00 |
09:50:05.31 |
+59:58:25.7 |
HIP 48140 |
11.95 |
| 2026-09-24 00:00 |
09:50:09.55 |
+59:58:36.9 |
HIP 48140 |
12.26 |
| 2026-09-24 12:00 |
09:50:13.77 |
+59:58:48.3 |
HIP 48140 |
12.58 |
| 2026-09-25 00:00 |
09:50:17.96 |
+59:59:00.0 |
HIP 48140 |
12.91 |
| 2026-09-25 12:00 |
09:50:22.12 |
+59:59:12.0 |
HIP 48283 |
12.82 |
| 2026-09-26 00:00 |
09:50:26.25 |
+59:59:24.3 |
HIP 48283 |
12.54 |
| 2026-09-26 12:00 |
09:50:30.36 |
+59:59:36.8 |
HIP 48283 |
12.27 |
| 2026-09-27 00:00 |
09:50:34.44 |
+59:59:49.6 |
HIP 48283 |
12.02 |
| 2026-09-27 12:00 |
09:50:38.49 |
+60:00:02.7 |
HIP 48283 |
11.79 |
| 2026-09-28 00:00 |
09:50:42.51 |
+60:00:16.0 |
HIP 48283 |
11.57 |
| 2026-09-28 12:00 |
09:50:46.50 |
+60:00:29.6 |
HIP 48283 |
11.37 |
| 2026-09-29 00:00 |
09:50:50.47 |
+60:00:43.5 |
HIP 48283 |
11.19 |
| 2026-09-29 12:00 |
09:50:54.40 |
+60:00:57.6 |
HIP 48283 |
11.03 |
| 2026-09-30 00:00 |
09:50:58.31 |
+60:01:12.1 |
HIP 48283 |
10.88 |
| 2026-09-30 12:00 |
09:51:02.19 |
+60:01:26.7 |
HIP 48283 |
10.76 |
| 2026-10-01 00:00 |
09:51:06.03 |
+60:01:41.7 |
HIP 48283 |
10.66 |
| 2026-10-01 12:00 |
09:51:09.85 |
+60:01:56.9 |
HIP 48283 |
10.58 |
| 2026-10-02 00:00 |
09:51:13.63 |
+60:02:12.4 |
HIP 48283 |
10.52 |
| 2026-10-02 12:00 |
09:51:17.38 |
+60:02:28.1 |
HIP 48283 |
10.48 |
| 2026-10-03 00:00 |
09:51:21.11 |
+60:02:44.1 |
HIP 48283 |
10.46 |
| 2026-10-03 12:00 |
09:51:24.80 |
+60:03:00.4 |
HIP 48283 |
10.47 |
| 2026-10-04 00:00 |
09:51:28.45 |
+60:03:16.9 |
HIP 48283 |
10.49 |
| 2026-10-04 12:00 |
09:51:32.08 |
+60:03:33.7 |
HIP 48283 |
10.54 |
| 2026-10-05 00:00 |
09:51:35.67 |
+60:03:50.8 |
HIP 48283 |
10.60 |
| 2026-10-05 12:00 |
09:51:39.23 |
+60:04:08.1 |
HIP 48283 |
10.69 |
| 2026-10-06 00:00 |
09:51:42.76 |
+60:04:25.7 |
HIP 48283 |
10.80 |
| 2026-10-06 12:00 |
09:51:46.25 |
+60:04:43.6 |
HIP 48283 |
10.92 |
| 2026-10-07 00:00 |
09:51:49.71 |
+60:05:01.7 |
HIP 48283 |
11.06 |
| 2026-10-07 12:00 |
09:51:53.13 |
+60:05:20.0 |
HIP 48283 |
11.22 |
| 2026-10-08 00:00 |
09:51:56.52 |
+60:05:38.7 |
HIP 48283 |
11.40 |
| 2026-10-08 12:00 |
09:51:59.87 |
+60:05:57.5 |
HIP 48422 |
11.08 |
| 2026-10-09 00:00 |
09:52:03.19 |
+60:06:16.7 |
HIP 48422 |
10.69 |
| 2026-10-09 12:00 |
09:52:06.47 |
+60:06:36.1 |
HIP 48422 |
10.32 |
| 2026-10-10 00:00 |
09:52:09.72 |
+60:06:55.7 |
HIP 48422 |
9.95 |
| 2026-10-10 12:00 |
09:52:12.93 |
+60:07:15.6 |
HIP 48422 |
9.60 |
| 2026-10-11 00:00 |
09:52:16.10 |
+60:07:35.8 |
HIP 48422 |
9.25 |