C/1998 K5 (LINEAR)
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) |
| 2026-02-03 00:00 |
07:46:32.54 |
+10:54:23.4 |
HIP 37921 |
9.21 |
| 2026-02-03 12:00 |
07:46:30.11 |
+10:54:32.1 |
HIP 37921 |
9.10 |
| 2026-02-04 00:00 |
07:46:27.68 |
+10:54:40.8 |
HIP 37921 |
9.03 |
| 2026-02-04 12:00 |
07:46:25.26 |
+10:54:49.6 |
HIP 37921 |
9.01 |
| 2026-02-05 00:00 |
07:46:22.85 |
+10:54:58.3 |
HIP 37921 |
9.02 |
| 2026-02-05 12:00 |
07:46:20.45 |
+10:55:07.2 |
HIP 37921 |
9.08 |
| 2026-02-06 00:00 |
07:46:18.06 |
+10:55:16.0 |
HIP 37921 |
9.18 |
| 2026-02-06 12:00 |
07:46:15.68 |
+10:55:24.9 |
HIP 37921 |
9.32 |
| 2026-02-07 00:00 |
07:46:13.30 |
+10:55:33.8 |
HIP 37921 |
9.49 |
| 2026-02-07 12:00 |
07:46:10.94 |
+10:55:42.8 |
HIP 37921 |
9.70 |
| 2026-02-08 00:00 |
07:46:08.59 |
+10:55:51.8 |
HIP 37921 |
9.94 |
| 2026-02-08 12:00 |
07:46:06.24 |
+10:56:00.8 |
HIP 37921 |
10.21 |
| 2026-02-09 00:00 |
07:46:03.91 |
+10:56:09.8 |
HIP 37921 |
10.51 |
| 2026-02-09 12:00 |
07:46:01.58 |
+10:56:18.9 |
HIP 37921 |
10.83 |
| 2026-02-10 00:00 |
07:45:59.27 |
+10:56:27.9 |
HIP 37921 |
11.17 |
| 2026-02-10 12:00 |
07:45:56.96 |
+10:56:37.1 |
HIP 37921 |
11.53 |
| 2026-02-11 00:00 |
07:45:54.67 |
+10:56:46.2 |
HIP 37921 |
11.91 |
| 2026-02-11 12:00 |
07:45:52.39 |
+10:56:55.4 |
HIP 37921 |
12.30 |
| 2026-02-12 00:00 |
07:45:50.12 |
+10:57:04.5 |
HIP 37921 |
12.71 |
| 2026-02-12 12:00 |
07:45:47.86 |
+10:57:13.8 |
HIP 37921 |
13.13 |
| 2026-02-13 00:00 |
07:45:45.61 |
+10:57:23.0 |
HIP 37921 |
13.56 |
| 2026-02-13 12:00 |
07:45:43.38 |
+10:57:32.2 |
HIP 37921 |
13.99 |
| 2026-02-14 00:00 |
07:45:41.16 |
+10:57:41.5 |
HIP 37921 |
14.44 |
| 2026-02-14 12:00 |
07:45:38.94 |
+10:57:50.8 |
HIP 37921 |
14.89 |
| 2026-02-15 00:00 |
07:45:36.74 |
+10:58:00.1 |
HIP 37921 |
15.35 |
| 2026-02-15 12:00 |
07:45:34.56 |
+10:58:09.5 |
HIP 37921 |
15.81 |
| 2026-02-16 00:00 |
07:45:32.38 |
+10:58:18.8 |
HIP 37921 |
16.28 |
| 2026-02-16 12:00 |
07:45:30.22 |
+10:58:28.2 |
HIP 37921 |
16.75 |
| 2026-02-17 00:00 |
07:45:28.08 |
+10:58:37.6 |
HIP 37921 |
17.22 |
| 2026-02-17 12:00 |
07:45:25.94 |
+10:58:47.0 |
HIP 37921 |
17.70 |
| 2026-02-18 00:00 |
07:45:23.82 |
+10:58:56.4 |
HIP 37921 |
18.18 |
| 2026-02-18 12:00 |
07:45:21.71 |
+10:59:05.8 |
HIP 37921 |
18.66 |
| 2026-02-19 00:00 |
07:45:19.62 |
+10:59:15.2 |
HIP 37921 |
19.13 |
| 2026-02-19 12:00 |
07:45:17.54 |
+10:59:24.7 |
HIP 37921 |
19.62 |
| 2026-02-20 00:00 |
07:45:15.47 |
+10:59:34.1 |
HIP 37921 |
20.10 |
| 2026-02-20 12:00 |
07:45:13.42 |
+10:59:43.6 |
HIP 37921 |
20.58 |
| 2026-02-21 00:00 |
07:45:11.39 |
+10:59:53.1 |
HIP 37921 |
21.06 |
| 2026-02-21 12:00 |
07:45:09.37 |
+11:00:02.6 |
HIP 37921 |
21.54 |
| 2026-02-22 00:00 |
07:45:07.36 |
+11:00:12.1 |
HIP 37921 |
22.02 |
| 2026-02-22 12:00 |
07:45:05.37 |
+11:00:21.6 |
HIP 37921 |
22.49 |
| 2026-02-23 00:00 |
07:45:03.39 |
+11:00:31.1 |
HIP 37921 |
22.97 |
| 2026-02-23 12:00 |
07:45:01.43 |
+11:00:40.6 |
HIP 37921 |
23.44 |
| 2026-02-24 00:00 |
07:44:59.48 |
+11:00:50.1 |
HIP 37921 |
23.92 |