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) |
| 2026-03-26 00:00 |
04:45:59.78 |
+37:20:50.1 |
HIP 22091 |
10.81 |
| 2026-03-26 12:00 |
04:46:00.94 |
+37:20:44.5 |
HIP 22091 |
10.99 |
| 2026-03-27 00:00 |
04:46:02.11 |
+37:20:39.0 |
HIP 22091 |
11.17 |
| 2026-03-27 12:00 |
04:46:03.31 |
+37:20:33.5 |
HIP 22091 |
11.36 |
| 2026-03-28 00:00 |
04:46:04.53 |
+37:20:28.2 |
HIP 22091 |
11.56 |
| 2026-03-28 12:00 |
04:46:05.78 |
+37:20:22.9 |
HIP 22091 |
11.77 |
| 2026-03-29 00:00 |
04:46:07.05 |
+37:20:17.6 |
HIP 22091 |
11.98 |
| 2026-03-29 12:00 |
04:46:08.34 |
+37:20:12.5 |
HIP 22091 |
12.20 |
| 2026-03-30 00:00 |
04:46:09.66 |
+37:20:07.4 |
HIP 22091 |
12.43 |
| 2026-03-30 12:00 |
04:46:10.99 |
+37:20:02.4 |
HIP 22091 |
12.66 |
| 2026-03-31 00:00 |
04:46:12.35 |
+37:19:57.4 |
HIP 22091 |
12.90 |
| 2026-03-31 12:00 |
04:46:13.73 |
+37:19:52.5 |
HIP 22091 |
13.14 |
| 2026-04-01 00:00 |
04:46:15.14 |
+37:19:47.7 |
HIP 22091 |
13.40 |
| 2026-04-01 12:00 |
04:46:16.57 |
+37:19:43.0 |
HIP 22091 |
13.65 |
| 2026-04-02 00:00 |
04:46:18.01 |
+37:19:38.3 |
HIP 22091 |
13.92 |
| 2026-04-02 12:00 |
04:46:19.48 |
+37:19:33.7 |
HIP 22091 |
14.19 |
| 2026-04-03 00:00 |
04:46:20.98 |
+37:19:29.2 |
HIP 22091 |
14.46 |
| 2026-04-03 12:00 |
04:46:22.49 |
+37:19:24.8 |
HIP 22091 |
14.74 |
| 2026-04-04 00:00 |
04:46:24.02 |
+37:19:20.4 |
HIP 22091 |
15.03 |
| 2026-04-04 12:00 |
04:46:25.58 |
+37:19:16.1 |
HIP 22091 |
15.32 |
| 2026-04-05 00:00 |
04:46:27.16 |
+37:19:11.9 |
HIP 22091 |
15.62 |
| 2026-04-05 12:00 |
04:46:28.76 |
+37:19:07.7 |
HIP 22091 |
15.92 |
| 2026-04-06 00:00 |
04:46:30.38 |
+37:19:03.6 |
HIP 22091 |
16.23 |
| 2026-04-06 12:00 |
04:46:32.02 |
+37:18:59.6 |
HIP 22091 |
16.55 |
| 2026-04-07 00:00 |
04:46:33.68 |
+37:18:55.7 |
HIP 22091 |
16.86 |
| 2026-04-07 12:00 |
04:46:35.36 |
+37:18:51.8 |
HIP 22091 |
17.19 |
| 2026-04-08 00:00 |
04:46:37.07 |
+37:18:48.1 |
HIP 22091 |
17.51 |
| 2026-04-08 12:00 |
04:46:38.79 |
+37:18:44.4 |
HIP 22091 |
17.85 |
| 2026-04-09 00:00 |
04:46:40.53 |
+37:18:40.7 |
HIP 22091 |
18.19 |
| 2026-04-09 12:00 |
04:46:42.30 |
+37:18:37.2 |
HIP 22091 |
18.53 |
| 2026-04-10 00:00 |
04:46:44.08 |
+37:18:33.7 |
HIP 22091 |
18.87 |
| 2026-04-10 12:00 |
04:46:45.89 |
+37:18:30.3 |
HIP 22091 |
19.23 |
| 2026-04-11 00:00 |
04:46:47.71 |
+37:18:27.0 |
HIP 22091 |
19.58 |
| 2026-04-11 12:00 |
04:46:49.56 |
+37:18:23.7 |
HIP 22091 |
19.94 |
| 2026-04-12 00:00 |
04:46:51.42 |
+37:18:20.6 |
HIP 22091 |
20.31 |
| 2026-04-12 12:00 |
04:46:53.30 |
+37:18:17.5 |
HIP 22091 |
20.68 |
| 2026-04-13 00:00 |
04:46:55.20 |
+37:18:14.5 |
HIP 22091 |
21.05 |
| 2026-04-13 12:00 |
04:46:57.12 |
+37:18:11.5 |
HIP 22091 |
21.43 |
| 2026-04-14 00:00 |
04:46:59.06 |
+37:18:08.7 |
HIP 22091 |
21.81 |
| 2026-04-14 12:00 |
04:47:01.02 |
+37:18:05.9 |
HIP 22091 |
22.20 |
| 2026-04-15 00:00 |
04:47:03.00 |
+37:18:03.2 |
HIP 22091 |
22.58 |
| 2026-04-15 12:00 |
04:47:05.00 |
+37:18:00.6 |
HIP 22091 |
22.98 |
| 2026-04-16 00:00 |
04:47:07.01 |
+37:17:58.0 |
HIP 22091 |
23.38 |