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) |
| 2026-06-01 00:00 |
07:44:57.30 |
+11:20:03.1 |
HIP 37852 |
26.19 |
| 2026-06-01 12:00 |
07:44:59.15 |
+11:20:02.8 |
HIP 37852 |
26.04 |
| 2026-06-02 00:00 |
07:45:01.02 |
+11:20:02.3 |
HIP 37852 |
25.90 |
| 2026-06-02 12:00 |
07:45:02.90 |
+11:20:01.8 |
HIP 37852 |
25.77 |
| 2026-06-03 00:00 |
07:45:04.80 |
+11:20:01.2 |
HIP 37852 |
25.64 |
| 2026-06-03 12:00 |
07:45:06.70 |
+11:20:00.5 |
HIP 37852 |
25.52 |
| 2026-06-04 00:00 |
07:45:08.63 |
+11:19:59.8 |
HIP 37852 |
25.42 |
| 2026-06-04 12:00 |
07:45:10.56 |
+11:19:59.0 |
HIP 37852 |
25.32 |
| 2026-06-05 00:00 |
07:45:12.51 |
+11:19:58.1 |
HIP 37852 |
25.22 |
| 2026-06-05 12:00 |
07:45:14.47 |
+11:19:57.1 |
HIP 37852 |
25.14 |
| 2026-06-06 00:00 |
07:45:16.45 |
+11:19:56.0 |
HIP 37852 |
25.07 |
| 2026-06-06 12:00 |
07:45:18.43 |
+11:19:54.9 |
HIP 37852 |
25.01 |
| 2026-06-07 00:00 |
07:45:20.43 |
+11:19:53.7 |
HIP 37852 |
24.96 |
| 2026-06-07 12:00 |
07:45:22.45 |
+11:19:52.4 |
HIP 37852 |
24.92 |
| 2026-06-08 00:00 |
07:45:24.47 |
+11:19:51.0 |
HIP 37852 |
24.89 |
| 2026-06-08 12:00 |
07:45:26.51 |
+11:19:49.6 |
HIP 37852 |
24.87 |
| 2026-06-09 00:00 |
07:45:28.56 |
+11:19:48.1 |
HIP 37852 |
24.86 |
| 2026-06-09 12:00 |
07:45:30.62 |
+11:19:46.5 |
HIP 37852 |
24.86 |
| 2026-06-10 00:00 |
07:45:32.69 |
+11:19:44.8 |
HIP 37852 |
24.88 |
| 2026-06-10 12:00 |
07:45:34.78 |
+11:19:43.1 |
HIP 37852 |
24.91 |
| 2026-06-11 00:00 |
07:45:36.87 |
+11:19:41.2 |
HIP 37852 |
24.94 |
| 2026-06-11 12:00 |
07:45:38.98 |
+11:19:39.3 |
HIP 37852 |
24.99 |
| 2026-06-12 00:00 |
07:45:41.10 |
+11:19:37.4 |
HIP 37852 |
25.06 |
| 2026-06-12 12:00 |
07:45:43.23 |
+11:19:35.3 |
HIP 37852 |
25.13 |
| 2026-06-13 00:00 |
07:45:45.37 |
+11:19:33.2 |
HIP 37852 |
25.22 |
| 2026-06-13 12:00 |
07:45:47.53 |
+11:19:31.0 |
HIP 37852 |
25.32 |
| 2026-06-14 00:00 |
07:45:49.69 |
+11:19:28.7 |
HIP 37852 |
25.43 |
| 2026-06-14 12:00 |
07:45:51.86 |
+11:19:26.4 |
HIP 37852 |
25.55 |
| 2026-06-15 00:00 |
07:45:54.05 |
+11:19:23.9 |
HIP 37852 |
25.68 |
| 2026-06-15 12:00 |
07:45:56.24 |
+11:19:21.4 |
HIP 37852 |
25.83 |
| 2026-06-16 00:00 |
07:45:58.45 |
+11:19:18.9 |
HIP 37852 |
25.99 |
| 2026-06-16 12:00 |
07:46:00.66 |
+11:19:16.2 |
HIP 37852 |
26.16 |
| 2026-06-17 00:00 |
07:46:02.89 |
+11:19:13.5 |
HIP 37852 |
26.35 |
| 2026-06-17 12:00 |
07:46:05.12 |
+11:19:10.7 |
HIP 37852 |
26.54 |
| 2026-06-18 00:00 |
07:46:07.36 |
+11:19:07.8 |
HIP 37852 |
26.75 |
| 2026-06-18 12:00 |
07:46:09.62 |
+11:19:04.9 |
HIP 37852 |
26.97 |
| 2026-06-19 00:00 |
07:46:11.88 |
+11:19:01.8 |
HIP 37852 |
27.20 |
| 2026-06-19 12:00 |
07:46:14.15 |
+11:18:58.8 |
HIP 37852 |
27.44 |
| 2026-06-20 00:00 |
07:46:16.43 |
+11:18:55.6 |
HIP 37852 |
27.69 |
| 2026-06-20 12:00 |
07:46:18.72 |
+11:18:52.3 |
HIP 38057 |
27.67 |
| 2026-06-21 00:00 |
07:46:21.02 |
+11:18:49.0 |
HIP 38057 |
27.14 |
| 2026-06-21 12:00 |
07:46:23.32 |
+11:18:45.6 |
HIP 38057 |
26.62 |
| 2026-06-22 00:00 |
07:46:25.63 |
+11:18:42.2 |
HIP 38057 |
26.09 |