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) |
| 2026-09-20 00:00 |
04:57:27.58 |
+37:55:14.4 |
HIP 23013 |
6.53 |
| 2026-09-20 12:00 |
04:57:26.97 |
+37:55:24.3 |
HIP 23013 |
6.51 |
| 2026-09-21 00:00 |
04:57:26.34 |
+37:55:34.2 |
HIP 23013 |
6.50 |
| 2026-09-21 12:00 |
04:57:25.68 |
+37:55:44.0 |
HIP 23013 |
6.48 |
| 2026-09-22 00:00 |
04:57:25.00 |
+37:55:53.7 |
HIP 23013 |
6.47 |
| 2026-09-22 12:00 |
04:57:24.29 |
+37:56:03.5 |
HIP 23013 |
6.46 |
| 2026-09-23 00:00 |
04:57:23.56 |
+37:56:13.1 |
HIP 23013 |
6.46 |
| 2026-09-23 12:00 |
04:57:22.80 |
+37:56:22.8 |
HIP 23013 |
6.46 |
| 2026-09-24 00:00 |
04:57:22.02 |
+37:56:32.3 |
HIP 23013 |
6.46 |
| 2026-09-24 12:00 |
04:57:21.21 |
+37:56:41.9 |
HIP 23013 |
6.46 |
| 2026-09-25 00:00 |
04:57:20.38 |
+37:56:51.4 |
HIP 23013 |
6.47 |
| 2026-09-25 12:00 |
04:57:19.52 |
+37:57:00.8 |
HIP 23013 |
6.48 |
| 2026-09-26 00:00 |
04:57:18.63 |
+37:57:10.2 |
HIP 23013 |
6.50 |
| 2026-09-26 12:00 |
04:57:17.72 |
+37:57:19.5 |
HIP 23013 |
6.52 |
| 2026-09-27 00:00 |
04:57:16.79 |
+37:57:28.8 |
HIP 23013 |
6.55 |
| 2026-09-27 12:00 |
04:57:15.83 |
+37:57:38.0 |
HIP 23013 |
6.58 |
| 2026-09-28 00:00 |
04:57:14.85 |
+37:57:47.1 |
HIP 23013 |
6.62 |
| 2026-09-28 12:00 |
04:57:13.84 |
+37:57:56.2 |
HIP 23013 |
6.66 |
| 2026-09-29 00:00 |
04:57:12.81 |
+37:58:05.3 |
HIP 23013 |
6.71 |
| 2026-09-29 12:00 |
04:57:11.75 |
+37:58:14.3 |
HIP 23013 |
6.77 |
| 2026-09-30 00:00 |
04:57:10.67 |
+37:58:23.2 |
HIP 23013 |
6.83 |
| 2026-09-30 12:00 |
04:57:09.56 |
+37:58:32.1 |
HIP 23013 |
6.90 |
| 2026-10-01 00:00 |
04:57:08.43 |
+37:58:40.9 |
HIP 23013 |
6.98 |
| 2026-10-01 12:00 |
04:57:07.27 |
+37:58:49.7 |
HIP 23013 |
7.06 |
| 2026-10-02 00:00 |
04:57:06.09 |
+37:58:58.4 |
HIP 23013 |
7.15 |
| 2026-10-02 12:00 |
04:57:04.88 |
+37:59:07.1 |
HIP 23013 |
7.25 |
| 2026-10-03 00:00 |
04:57:03.65 |
+37:59:15.6 |
HIP 23013 |
7.36 |
| 2026-10-03 12:00 |
04:57:02.40 |
+37:59:24.2 |
HIP 23013 |
7.48 |
| 2026-10-04 00:00 |
04:57:01.12 |
+37:59:32.6 |
HIP 23013 |
7.60 |
| 2026-10-04 12:00 |
04:56:59.82 |
+37:59:41.0 |
HIP 23013 |
7.73 |
| 2026-10-05 00:00 |
04:56:58.49 |
+37:59:49.4 |
HIP 23013 |
7.87 |
| 2026-10-05 12:00 |
04:56:57.14 |
+37:59:57.6 |
HIP 23013 |
8.01 |
| 2026-10-06 00:00 |
04:56:55.77 |
+38:00:05.8 |
HIP 23013 |
8.16 |
| 2026-10-06 12:00 |
04:56:54.37 |
+38:00:14.0 |
HIP 23013 |
8.32 |
| 2026-10-07 00:00 |
04:56:52.95 |
+38:00:22.1 |
HIP 23013 |
8.49 |
| 2026-10-07 12:00 |
04:56:51.50 |
+38:00:30.1 |
HIP 23013 |
8.67 |
| 2026-10-08 00:00 |
04:56:50.03 |
+38:00:38.0 |
HIP 23013 |
8.85 |
| 2026-10-08 12:00 |
04:56:48.54 |
+38:00:45.9 |
HIP 23013 |
9.04 |
| 2026-10-09 00:00 |
04:56:47.02 |
+38:00:53.7 |
HIP 23013 |
9.24 |
| 2026-10-09 12:00 |
04:56:45.48 |
+38:01:01.4 |
HIP 23013 |
9.45 |
| 2026-10-10 00:00 |
04:56:43.92 |
+38:01:09.1 |
HIP 23013 |
9.66 |
| 2026-10-10 12:00 |
04:56:42.33 |
+38:01:16.7 |
HIP 23013 |
9.88 |
| 2026-10-11 00:00 |
04:56:40.72 |
+38:01:24.2 |
HIP 23013 |
10.11 |