メタデータ
| 項目 |
値 |
| Designation |
C/1998 M5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-01-24T13:39:13.763520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:54Z |
| Obs used |
1238 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
5.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-11-27.0000000 |
| e |
0.99602466 |
| q (au) |
1.742289 |
| a (au) |
438.273933 |
| i (deg) |
82.228882 |
| Ω (om, deg) |
333.376703 |
| ω (w, deg) |
101.282943 |
| M (ma, deg) |
359.993709 |
等級
散乱 + 全体線形
$$
M_a = (4.498 + 5.665\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.498 |
| n |
5.665 |
| gf |
1.000 |
| gb |
-0.954 |
| k |
0.996 |
| 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) |
| 2026-07-29 00:00 |
08:06:18.62 |
-64:44:31.1 |
HIP 39445 |
17.27 |
| 2026-07-29 12:00 |
08:06:23.91 |
-64:44:37.2 |
HIP 39445 |
17.83 |
| 2026-07-30 00:00 |
08:06:29.20 |
-64:44:43.6 |
HIP 39922 |
17.47 |
| 2026-07-30 12:00 |
08:06:34.48 |
-64:44:50.2 |
HIP 39922 |
16.90 |
| 2026-07-31 00:00 |
08:06:39.75 |
-64:44:57.2 |
HIP 39922 |
16.32 |
| 2026-07-31 12:00 |
08:06:45.02 |
-64:45:04.4 |
HIP 39922 |
15.75 |
| 2026-08-01 00:00 |
08:06:50.28 |
-64:45:11.9 |
HIP 39922 |
15.18 |
| 2026-08-01 12:00 |
08:06:55.54 |
-64:45:19.8 |
HIP 39922 |
14.61 |
| 2026-08-02 00:00 |
08:07:00.79 |
-64:45:27.8 |
HIP 39922 |
14.04 |
| 2026-08-02 12:00 |
08:07:06.03 |
-64:45:36.2 |
HIP 39922 |
13.48 |
| 2026-08-03 00:00 |
08:07:11.26 |
-64:45:44.8 |
HIP 39922 |
12.91 |
| 2026-08-03 12:00 |
08:07:16.49 |
-64:45:53.8 |
HIP 39922 |
12.34 |
| 2026-08-04 00:00 |
08:07:21.70 |
-64:46:03.0 |
HIP 39922 |
11.78 |
| 2026-08-04 12:00 |
08:07:26.91 |
-64:46:12.5 |
HIP 39922 |
11.22 |
| 2026-08-05 00:00 |
08:07:32.11 |
-64:46:22.3 |
HIP 39922 |
10.66 |
| 2026-08-05 12:00 |
08:07:37.30 |
-64:46:32.3 |
HIP 39922 |
10.11 |
| 2026-08-06 00:00 |
08:07:42.48 |
-64:46:42.6 |
HIP 39922 |
9.55 |
| 2026-08-06 12:00 |
08:07:47.65 |
-64:46:53.3 |
HIP 39922 |
9.01 |
| 2026-08-07 00:00 |
08:07:52.81 |
-64:47:04.1 |
HIP 39922 |
8.47 |
| 2026-08-07 12:00 |
08:07:57.95 |
-64:47:15.3 |
HIP 39922 |
7.93 |
| 2026-08-08 00:00 |
08:08:03.09 |
-64:47:26.8 |
HIP 39922 |
7.41 |
| 2026-08-08 12:00 |
08:08:08.22 |
-64:47:38.5 |
HIP 39922 |
6.89 |
| 2026-08-09 00:00 |
08:08:13.33 |
-64:47:50.5 |
HIP 39922 |
6.39 |
| 2026-08-09 12:00 |
08:08:18.43 |
-64:48:02.8 |
HIP 39922 |
5.91 |
| 2026-08-10 00:00 |
08:08:23.52 |
-64:48:15.3 |
HIP 39922 |
5.44 |
| 2026-08-10 12:00 |
08:08:28.60 |
-64:48:28.2 |
HIP 39922 |
5.01 |
| 2026-08-11 00:00 |
08:08:33.66 |
-64:48:41.3 |
HIP 39922 |
4.61 |
| 2026-08-11 12:00 |
08:08:38.71 |
-64:48:54.7 |
HIP 39922 |
4.26 |
| 2026-08-12 00:00 |
08:08:43.75 |
-64:49:08.3 |
HIP 39922 |
3.96 |
| 2026-08-12 12:00 |
08:08:48.77 |
-64:49:22.3 |
HIP 39922 |
3.74 |
| 2026-08-13 00:00 |
08:08:53.77 |
-64:49:36.5 |
HIP 39922 |
3.61 |
| 2026-08-13 12:00 |
08:08:58.77 |
-64:49:50.9 |
HIP 39922 |
3.57 |
| 2026-08-14 00:00 |
08:09:03.74 |
-64:50:05.7 |
HIP 39922 |
3.63 |
| 2026-08-14 12:00 |
08:09:08.70 |
-64:50:20.7 |
HIP 39922 |
3.79 |
| 2026-08-15 00:00 |
08:09:13.65 |
-64:50:36.0 |
HIP 39922 |
4.03 |
| 2026-08-15 12:00 |
08:09:18.57 |
-64:50:51.5 |
HIP 39922 |
4.34 |
| 2026-08-16 00:00 |
08:09:23.49 |
-64:51:07.3 |
HIP 39922 |
4.71 |
| 2026-08-16 12:00 |
08:09:28.38 |
-64:51:23.4 |
HIP 39922 |
5.12 |
| 2026-08-17 00:00 |
08:09:33.26 |
-64:51:39.8 |
HIP 39922 |
5.56 |
| 2026-08-17 12:00 |
08:09:38.12 |
-64:51:56.4 |
HIP 39922 |
6.03 |
| 2026-08-18 00:00 |
08:09:42.96 |
-64:52:13.2 |
HIP 39922 |
6.53 |
| 2026-08-18 12:00 |
08:09:47.78 |
-64:52:30.4 |
HIP 39922 |
7.04 |
| 2026-08-19 00:00 |
08:09:52.58 |
-64:52:47.8 |
HIP 39922 |
7.56 |