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) |
| 2026-07-29 00:00 |
03:58:21.25 |
+16:49:58.7 |
HIP 18609 |
9.21 |
| 2026-07-29 12:00 |
03:58:22.79 |
+16:49:57.5 |
HIP 18609 |
8.90 |
| 2026-07-30 00:00 |
03:58:24.30 |
+16:49:56.2 |
HIP 18609 |
8.60 |
| 2026-07-30 12:00 |
03:58:25.78 |
+16:49:54.8 |
HIP 18609 |
8.30 |
| 2026-07-31 00:00 |
03:58:27.23 |
+16:49:53.3 |
HIP 18609 |
8.02 |
| 2026-07-31 12:00 |
03:58:28.65 |
+16:49:51.8 |
HIP 18609 |
7.75 |
| 2026-08-01 00:00 |
03:58:30.05 |
+16:49:50.1 |
HIP 18609 |
7.49 |
| 2026-08-01 12:00 |
03:58:31.42 |
+16:49:48.3 |
HIP 18609 |
7.25 |
| 2026-08-02 00:00 |
03:58:32.76 |
+16:49:46.4 |
HIP 18609 |
7.02 |
| 2026-08-02 12:00 |
03:58:34.07 |
+16:49:44.4 |
HIP 18609 |
6.80 |
| 2026-08-03 00:00 |
03:58:35.35 |
+16:49:42.3 |
HIP 18609 |
6.60 |
| 2026-08-03 12:00 |
03:58:36.60 |
+16:49:40.1 |
HIP 18609 |
6.41 |
| 2026-08-04 00:00 |
03:58:37.83 |
+16:49:37.8 |
HIP 18609 |
6.23 |
| 2026-08-04 12:00 |
03:58:39.02 |
+16:49:35.5 |
HIP 18609 |
6.07 |
| 2026-08-05 00:00 |
03:58:40.19 |
+16:49:33.0 |
HIP 18609 |
5.93 |
| 2026-08-05 12:00 |
03:58:41.33 |
+16:49:30.4 |
HIP 18609 |
5.80 |
| 2026-08-06 00:00 |
03:58:42.44 |
+16:49:27.7 |
HIP 18609 |
5.69 |
| 2026-08-06 12:00 |
03:58:43.51 |
+16:49:24.9 |
HIP 18609 |
5.59 |
| 2026-08-07 00:00 |
03:58:44.56 |
+16:49:22.0 |
HIP 18609 |
5.51 |
| 2026-08-07 12:00 |
03:58:45.58 |
+16:49:19.1 |
HIP 18609 |
5.45 |
| 2026-08-08 00:00 |
03:58:46.57 |
+16:49:16.0 |
HIP 18609 |
5.40 |
| 2026-08-08 12:00 |
03:58:47.53 |
+16:49:12.8 |
HIP 18609 |
5.36 |
| 2026-08-09 00:00 |
03:58:48.46 |
+16:49:09.5 |
HIP 18609 |
5.34 |
| 2026-08-09 12:00 |
03:58:49.36 |
+16:49:06.1 |
HIP 18609 |
5.33 |
| 2026-08-10 00:00 |
03:58:50.23 |
+16:49:02.6 |
HIP 18609 |
5.33 |
| 2026-08-10 12:00 |
03:58:51.06 |
+16:48:59.1 |
HIP 18609 |
5.35 |
| 2026-08-11 00:00 |
03:58:51.87 |
+16:48:55.4 |
HIP 18609 |
5.37 |
| 2026-08-11 12:00 |
03:58:52.65 |
+16:48:51.6 |
HIP 18609 |
5.41 |
| 2026-08-12 00:00 |
03:58:53.39 |
+16:48:47.7 |
HIP 18609 |
5.45 |
| 2026-08-12 12:00 |
03:58:54.11 |
+16:48:43.7 |
HIP 18609 |
5.51 |
| 2026-08-13 00:00 |
03:58:54.79 |
+16:48:39.6 |
HIP 18609 |
5.57 |
| 2026-08-13 12:00 |
03:58:55.44 |
+16:48:35.4 |
HIP 18609 |
5.64 |
| 2026-08-14 00:00 |
03:58:56.06 |
+16:48:31.1 |
HIP 18609 |
5.71 |
| 2026-08-14 12:00 |
03:58:56.65 |
+16:48:26.7 |
HIP 18609 |
5.79 |
| 2026-08-15 00:00 |
03:58:57.21 |
+16:48:22.3 |
HIP 18609 |
5.87 |
| 2026-08-15 12:00 |
03:58:57.74 |
+16:48:17.7 |
HIP 18609 |
5.96 |
| 2026-08-16 00:00 |
03:58:58.23 |
+16:48:13.0 |
HIP 18609 |
6.05 |
| 2026-08-16 12:00 |
03:58:58.70 |
+16:48:08.2 |
HIP 18609 |
6.14 |
| 2026-08-17 00:00 |
03:58:59.13 |
+16:48:03.3 |
HIP 18609 |
6.24 |
| 2026-08-17 12:00 |
03:58:59.53 |
+16:47:58.3 |
HIP 18609 |
6.33 |
| 2026-08-18 00:00 |
03:58:59.90 |
+16:47:53.2 |
HIP 18609 |
6.43 |
| 2026-08-18 12:00 |
03:59:00.24 |
+16:47:48.0 |
HIP 18609 |
6.53 |
| 2026-08-19 00:00 |
03:59:00.54 |
+16:47:42.7 |
HIP 18609 |
6.63 |