C/1998 K2 (LINEAR)
メタデータ
| 項目 |
値 |
| Designation |
C/1998 K2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-09-01T05:31:38.231040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
201 |
| NEO |
- |
| M1 |
10.300 |
| K1 |
5.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-10-01.0000000 |
| e |
0.99927629 |
| q (au) |
2.323478 |
| a (au) |
3210.507001 |
| i (deg) |
64.456675 |
| Ω (om, deg) |
68.781077 |
| ω (w, deg) |
221.417912 |
| M (ma, deg) |
0.000161 |
等級
散乱 + 全体線形
$$
M_a = (11.927 + 2.178\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.927 |
| n |
2.178 |
| gf |
1.000 |
| gb |
-0.601 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
04:46:16.81 |
+37:34:30.2 |
HIP 22115 |
12.80 |
| 2026-02-03 12:00 |
04:46:15.33 |
+37:34:20.9 |
HIP 22115 |
12.73 |
| 2026-02-04 00:00 |
04:46:13.88 |
+37:34:11.7 |
HIP 22115 |
12.67 |
| 2026-02-04 12:00 |
04:46:12.45 |
+37:34:02.5 |
HIP 22115 |
12.63 |
| 2026-02-05 00:00 |
04:46:11.05 |
+37:33:53.2 |
HIP 22115 |
12.60 |
| 2026-02-05 12:00 |
04:46:09.67 |
+37:33:44.0 |
HIP 22115 |
12.57 |
| 2026-02-06 00:00 |
04:46:08.31 |
+37:33:34.7 |
HIP 22115 |
12.56 |
| 2026-02-06 12:00 |
04:46:06.98 |
+37:33:25.5 |
HIP 22115 |
12.56 |
| 2026-02-07 00:00 |
04:46:05.67 |
+37:33:16.2 |
HIP 22115 |
12.56 |
| 2026-02-07 12:00 |
04:46:04.39 |
+37:33:07.0 |
HIP 22115 |
12.58 |
| 2026-02-08 00:00 |
04:46:03.14 |
+37:32:57.8 |
HIP 22115 |
12.61 |
| 2026-02-08 12:00 |
04:46:01.91 |
+37:32:48.5 |
HIP 22115 |
12.64 |
| 2026-02-09 00:00 |
04:46:00.70 |
+37:32:39.3 |
HIP 22115 |
12.68 |
| 2026-02-09 12:00 |
04:45:59.53 |
+37:32:30.1 |
HIP 22115 |
12.73 |
| 2026-02-10 00:00 |
04:45:58.37 |
+37:32:20.9 |
HIP 22115 |
12.79 |
| 2026-02-10 12:00 |
04:45:57.24 |
+37:32:11.7 |
HIP 22115 |
12.86 |
| 2026-02-11 00:00 |
04:45:56.14 |
+37:32:02.5 |
HIP 22115 |
12.93 |
| 2026-02-11 12:00 |
04:45:55.07 |
+37:31:53.3 |
HIP 22115 |
13.01 |
| 2026-02-12 00:00 |
04:45:54.01 |
+37:31:44.1 |
HIP 22115 |
13.10 |
| 2026-02-12 12:00 |
04:45:52.99 |
+37:31:34.9 |
HIP 22115 |
13.19 |
| 2026-02-13 00:00 |
04:45:51.99 |
+37:31:25.8 |
HIP 22115 |
13.28 |
| 2026-02-13 12:00 |
04:45:51.02 |
+37:31:16.6 |
HIP 22115 |
13.38 |
| 2026-02-14 00:00 |
04:45:50.07 |
+37:31:07.5 |
HIP 22115 |
13.49 |
| 2026-02-14 12:00 |
04:45:49.15 |
+37:30:58.4 |
HIP 22115 |
13.60 |
| 2026-02-15 00:00 |
04:45:48.26 |
+37:30:49.3 |
HIP 22115 |
13.71 |
| 2026-02-15 12:00 |
04:45:47.39 |
+37:30:40.2 |
HIP 22115 |
13.83 |
| 2026-02-16 00:00 |
04:45:46.55 |
+37:30:31.1 |
HIP 22115 |
13.95 |
| 2026-02-16 12:00 |
04:45:45.73 |
+37:30:22.1 |
HIP 22115 |
14.07 |
| 2026-02-17 00:00 |
04:45:44.94 |
+37:30:13.0 |
HIP 22115 |
14.20 |
| 2026-02-17 12:00 |
04:45:44.18 |
+37:30:04.0 |
HIP 22115 |
14.33 |
| 2026-02-18 00:00 |
04:45:43.45 |
+37:29:55.0 |
HIP 22115 |
14.46 |
| 2026-02-18 12:00 |
04:45:42.74 |
+37:29:46.1 |
HIP 22115 |
14.60 |
| 2026-02-19 00:00 |
04:45:42.05 |
+37:29:37.1 |
HIP 22091 |
14.49 |
| 2026-02-19 12:00 |
04:45:41.40 |
+37:29:28.2 |
HIP 22091 |
14.30 |
| 2026-02-20 00:00 |
04:45:40.77 |
+37:29:19.3 |
HIP 22091 |
14.11 |
| 2026-02-20 12:00 |
04:45:40.17 |
+37:29:10.4 |
HIP 22091 |
13.92 |
| 2026-02-21 00:00 |
04:45:39.59 |
+37:29:01.6 |
HIP 22091 |
13.74 |
| 2026-02-21 12:00 |
04:45:39.04 |
+37:28:52.7 |
HIP 22091 |
13.56 |
| 2026-02-22 00:00 |
04:45:38.52 |
+37:28:43.9 |
HIP 22091 |
13.39 |
| 2026-02-22 12:00 |
04:45:38.03 |
+37:28:35.2 |
HIP 22091 |
13.21 |
| 2026-02-23 00:00 |
04:45:37.56 |
+37:28:26.4 |
HIP 22091 |
13.04 |
| 2026-02-23 12:00 |
04:45:37.12 |
+37:28:17.7 |
HIP 22091 |
12.87 |
| 2026-02-24 00:00 |
04:45:36.70 |
+37:28:09.1 |
HIP 22091 |
12.71 |