メタデータ
| 項目 |
値 |
| Designation |
C/1999 K4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-05-16T10:55:43.587840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
18 |
| NEO |
- |
| M1 |
18.500 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1999-05-20.0000000 |
| e |
0.91645495 |
| q (au) |
1.442437 |
| a (au) |
17.265376 |
| i (deg) |
120.773994 |
| Ω (om, deg) |
241.479276 |
| ω (w, deg) |
8.794388 |
| M (ma, deg) |
0.048698 |
等級
散乱 + 全体線形
$$
M_a = (19.052 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.052 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.999 |
| 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) |
| 2026-06-01 00:00 |
03:52:59.61 |
+16:42:34.6 |
HIP 18222 |
17.25 |
| 2026-06-01 12:00 |
03:53:03.16 |
+16:42:42.4 |
HIP 18222 |
16.62 |
| 2026-06-02 00:00 |
03:53:06.70 |
+16:42:50.1 |
HIP 18222 |
16.01 |
| 2026-06-02 12:00 |
03:53:10.24 |
+16:42:57.8 |
HIP 18222 |
15.42 |
| 2026-06-03 00:00 |
03:53:13.77 |
+16:43:05.5 |
HIP 18222 |
14.86 |
| 2026-06-03 12:00 |
03:53:17.30 |
+16:43:13.1 |
HIP 18222 |
14.34 |
| 2026-06-04 00:00 |
03:53:20.82 |
+16:43:20.7 |
HIP 18222 |
13.84 |
| 2026-06-04 12:00 |
03:53:24.33 |
+16:43:28.2 |
HIP 18222 |
13.39 |
| 2026-06-05 00:00 |
03:53:27.84 |
+16:43:35.6 |
HIP 18222 |
12.97 |
| 2026-06-05 12:00 |
03:53:31.34 |
+16:43:43.0 |
HIP 18222 |
12.60 |
| 2026-06-06 00:00 |
03:53:34.83 |
+16:43:50.4 |
HIP 18222 |
12.28 |
| 2026-06-06 12:00 |
03:53:38.32 |
+16:43:57.7 |
HIP 18222 |
12.01 |
| 2026-06-07 00:00 |
03:53:41.80 |
+16:44:04.9 |
HIP 18222 |
11.80 |
| 2026-06-07 12:00 |
03:53:45.27 |
+16:44:12.1 |
HIP 18222 |
11.64 |
| 2026-06-08 00:00 |
03:53:48.73 |
+16:44:19.2 |
HIP 18222 |
11.54 |
| 2026-06-08 12:00 |
03:53:52.19 |
+16:44:26.3 |
HIP 18267 |
11.34 |
| 2026-06-09 00:00 |
03:53:55.64 |
+16:44:33.3 |
HIP 18267 |
10.82 |
| 2026-06-09 12:00 |
03:53:59.08 |
+16:44:40.3 |
HIP 18267 |
10.33 |
| 2026-06-10 00:00 |
03:54:02.51 |
+16:44:47.2 |
HIP 18267 |
9.89 |
| 2026-06-10 12:00 |
03:54:05.93 |
+16:44:54.1 |
HIP 18267 |
9.50 |
| 2026-06-11 00:00 |
03:54:09.34 |
+16:45:00.9 |
HIP 18267 |
9.18 |
| 2026-06-11 12:00 |
03:54:12.74 |
+16:45:07.6 |
HIP 18267 |
8.91 |
| 2026-06-12 00:00 |
03:54:16.14 |
+16:45:14.3 |
HIP 18267 |
8.72 |
| 2026-06-12 12:00 |
03:54:19.52 |
+16:45:20.9 |
HIP 18267 |
8.60 |
| 2026-06-13 00:00 |
03:54:22.89 |
+16:45:27.4 |
HIP 18267 |
8.55 |
| 2026-06-13 12:00 |
03:54:26.26 |
+16:45:33.9 |
HIP 18267 |
8.59 |
| 2026-06-14 00:00 |
03:54:29.61 |
+16:45:40.3 |
HIP 18267 |
8.69 |
| 2026-06-14 12:00 |
03:54:32.95 |
+16:45:46.7 |
HIP 18267 |
8.87 |
| 2026-06-15 00:00 |
03:54:36.28 |
+16:45:53.0 |
HIP 18267 |
9.12 |
| 2026-06-15 12:00 |
03:54:39.60 |
+16:45:59.2 |
HIP 18267 |
9.42 |
| 2026-06-16 00:00 |
03:54:42.90 |
+16:46:05.4 |
HIP 18267 |
9.79 |
| 2026-06-16 12:00 |
03:54:46.20 |
+16:46:11.4 |
HIP 18267 |
10.19 |
| 2026-06-17 00:00 |
03:54:49.48 |
+16:46:17.5 |
HIP 18267 |
10.64 |
| 2026-06-17 12:00 |
03:54:52.75 |
+16:46:23.4 |
HIP 18267 |
11.13 |
| 2026-06-18 00:00 |
03:54:56.01 |
+16:46:29.3 |
HIP 18267 |
11.64 |
| 2026-06-18 12:00 |
03:54:59.25 |
+16:46:35.1 |
HIP 18267 |
12.19 |
| 2026-06-19 00:00 |
03:55:02.48 |
+16:46:40.9 |
HIP 18267 |
12.75 |
| 2026-06-19 12:00 |
03:55:05.70 |
+16:46:46.6 |
HIP 18327 |
13.14 |
| 2026-06-20 00:00 |
03:55:08.91 |
+16:46:52.2 |
HIP 18327 |
13.06 |
| 2026-06-20 12:00 |
03:55:12.10 |
+16:46:57.7 |
HIP 18327 |
13.02 |
| 2026-06-21 00:00 |
03:55:15.28 |
+16:47:03.2 |
HIP 18327 |
13.03 |
| 2026-06-21 12:00 |
03:55:18.44 |
+16:47:08.6 |
HIP 18327 |
13.09 |
| 2026-06-22 00:00 |
03:55:21.59 |
+16:47:13.9 |
HIP 18327 |
13.19 |