メタデータ
| 項目 |
値 |
| Designation |
C/1998 K5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-07-17T10:42:32.613120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
627 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
28.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-07-27.0000000 |
| e |
0.98669128 |
| q (au) |
0.963547 |
| a (au) |
72.399650 |
| i (deg) |
9.927137 |
| Ω (om, deg) |
211.117668 |
| ω (w, deg) |
99.460270 |
| M (ma, deg) |
0.015285 |
等級
散乱 + 全体線形
$$
M_a = (15.295 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.295 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.851 |
| k |
0.939 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1998-05-26 |
1998-06-15 |
+45.9853 |
-1.403 |
| 1998-06-15 |
1998-07-16 |
+6.3263 |
+0.583 |
| 1998-07-17 |
1998-09-22 |
-11.0269 |
-0.952 |
| 1998-09-22 |
1998-10-31 |
+26.5628 |
-7.342 |
| 1998-10-31 |
1998-12-19 |
-18.5111 |
+5.933 |
| 1998-12-19 |
1999-02-14 |
-0.4311 |
-1.229 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
07:49:28.64 |
+11:11:28.7 |
HIP 38119 |
11.82 |
| 2026-07-29 12:00 |
07:49:31.12 |
+11:11:20.8 |
HIP 38119 |
12.38 |
| 2026-07-30 00:00 |
07:49:33.60 |
+11:11:12.9 |
HIP 38119 |
12.95 |
| 2026-07-30 12:00 |
07:49:36.07 |
+11:11:04.9 |
HIP 38119 |
13.52 |
| 2026-07-31 00:00 |
07:49:38.54 |
+11:10:56.9 |
HIP 38119 |
14.09 |
| 2026-07-31 12:00 |
07:49:41.00 |
+11:10:48.8 |
HIP 38119 |
14.66 |
| 2026-08-01 00:00 |
07:49:43.46 |
+11:10:40.7 |
HIP 38119 |
15.24 |
| 2026-08-01 12:00 |
07:49:45.92 |
+11:10:32.6 |
HIP 38119 |
15.82 |
| 2026-08-02 00:00 |
07:49:48.37 |
+11:10:24.4 |
HIP 38119 |
16.40 |
| 2026-08-02 12:00 |
07:49:50.81 |
+11:10:16.1 |
HIP 38119 |
16.98 |
| 2026-08-03 00:00 |
07:49:53.25 |
+11:10:07.9 |
HIP 38119 |
17.57 |
| 2026-08-03 12:00 |
07:49:55.69 |
+11:09:59.6 |
HIP 38119 |
18.15 |
| 2026-08-04 00:00 |
07:49:58.12 |
+11:09:51.2 |
HIP 38119 |
18.73 |
| 2026-08-04 12:00 |
07:50:00.54 |
+11:09:42.8 |
HIP 38119 |
19.32 |
| 2026-08-05 00:00 |
07:50:02.96 |
+11:09:34.4 |
HIP 38119 |
19.90 |
| 2026-08-05 12:00 |
07:50:05.37 |
+11:09:25.9 |
HIP 38362 |
19.57 |
| 2026-08-06 00:00 |
07:50:07.78 |
+11:09:17.4 |
HIP 38362 |
18.98 |
| 2026-08-06 12:00 |
07:50:10.18 |
+11:09:08.9 |
HIP 38362 |
18.40 |
| 2026-08-07 00:00 |
07:50:12.57 |
+11:09:00.3 |
HIP 38362 |
17.82 |
| 2026-08-07 12:00 |
07:50:14.96 |
+11:08:51.7 |
HIP 38362 |
17.24 |
| 2026-08-08 00:00 |
07:50:17.34 |
+11:08:43.1 |
HIP 38362 |
16.67 |
| 2026-08-08 12:00 |
07:50:19.72 |
+11:08:34.4 |
HIP 38362 |
16.10 |
| 2026-08-09 00:00 |
07:50:22.08 |
+11:08:25.7 |
HIP 38362 |
15.54 |
| 2026-08-09 12:00 |
07:50:24.45 |
+11:08:17.0 |
HIP 38362 |
14.97 |
| 2026-08-10 00:00 |
07:50:26.80 |
+11:08:08.2 |
HIP 38362 |
14.42 |
| 2026-08-10 12:00 |
07:50:29.14 |
+11:07:59.4 |
HIP 38362 |
13.87 |
| 2026-08-11 00:00 |
07:50:31.48 |
+11:07:50.6 |
HIP 38362 |
13.32 |
| 2026-08-11 12:00 |
07:50:33.81 |
+11:07:41.7 |
HIP 38362 |
12.78 |
| 2026-08-12 00:00 |
07:50:36.13 |
+11:07:32.8 |
HIP 38362 |
12.25 |
| 2026-08-12 12:00 |
07:50:38.45 |
+11:07:23.9 |
HIP 38362 |
11.73 |
| 2026-08-13 00:00 |
07:50:40.75 |
+11:07:15.0 |
HIP 38362 |
11.21 |
| 2026-08-13 12:00 |
07:50:43.05 |
+11:07:06.0 |
HIP 38362 |
10.70 |
| 2026-08-14 00:00 |
07:50:45.34 |
+11:06:57.0 |
HIP 38362 |
10.21 |
| 2026-08-14 12:00 |
07:50:47.62 |
+11:06:48.0 |
HIP 38362 |
9.72 |
| 2026-08-15 00:00 |
07:50:49.89 |
+11:06:38.9 |
HIP 38362 |
9.25 |
| 2026-08-15 12:00 |
07:50:52.15 |
+11:06:29.8 |
HIP 38362 |
8.79 |
| 2026-08-16 00:00 |
07:50:54.40 |
+11:06:20.7 |
HIP 38362 |
8.35 |
| 2026-08-16 12:00 |
07:50:56.65 |
+11:06:11.6 |
HIP 38362 |
7.93 |
| 2026-08-17 00:00 |
07:50:58.88 |
+11:06:02.5 |
HIP 38362 |
7.53 |
| 2026-08-17 12:00 |
07:51:01.10 |
+11:05:53.3 |
HIP 38362 |
7.15 |
| 2026-08-18 00:00 |
07:51:03.32 |
+11:05:44.1 |
HIP 38362 |
6.80 |
| 2026-08-18 12:00 |
07:51:05.52 |
+11:05:34.9 |
HIP 38362 |
6.49 |
| 2026-08-19 00:00 |
07:51:07.72 |
+11:05:25.6 |
HIP 38362 |
6.21 |