メタデータ
| 項目 |
値 |
| Designation |
C/1998 M4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-12-10T02:48:12.064320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
116 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-07-03.0000000 |
| e |
0.99738677 |
| q (au) |
2.600017 |
| a (au) |
994.943592 |
| i (deg) |
154.571097 |
| Ω (om, deg) |
92.922669 |
| ω (w, deg) |
106.286301 |
| M (ma, deg) |
0.006434 |
等級
散乱 + 全体線形
$$
M_a = (10.999 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.999 |
| n |
2.000 |
| gf |
0.812 |
| gb |
-0.935 |
| k |
1.000 |
| δ90 |
2.369 |
| 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) |
| 2026-06-01 00:00 |
12:03:28.17 |
-28:08:27.2 |
HIP 58759 |
9.07 |
| 2026-06-01 12:00 |
12:03:27.18 |
-28:08:06.6 |
HIP 58759 |
9.21 |
| 2026-06-02 00:00 |
12:03:26.21 |
-28:07:46.1 |
HIP 58759 |
9.36 |
| 2026-06-02 12:00 |
12:03:25.25 |
-28:07:25.7 |
HIP 58759 |
9.54 |
| 2026-06-03 00:00 |
12:03:24.32 |
-28:07:05.3 |
HIP 58759 |
9.72 |
| 2026-06-03 12:00 |
12:03:23.41 |
-28:06:45.0 |
HIP 58759 |
9.92 |
| 2026-06-04 00:00 |
12:03:22.52 |
-28:06:24.7 |
HIP 58759 |
10.13 |
| 2026-06-04 12:00 |
12:03:21.64 |
-28:06:04.5 |
HIP 58759 |
10.36 |
| 2026-06-05 00:00 |
12:03:20.79 |
-28:05:44.4 |
HIP 58759 |
10.59 |
| 2026-06-05 12:00 |
12:03:19.96 |
-28:05:24.4 |
HIP 58759 |
10.83 |
| 2026-06-06 00:00 |
12:03:19.15 |
-28:05:04.4 |
HIP 58759 |
11.08 |
| 2026-06-06 12:00 |
12:03:18.36 |
-28:04:44.4 |
HIP 58759 |
11.34 |
| 2026-06-07 00:00 |
12:03:17.59 |
-28:04:24.6 |
HIP 58759 |
11.60 |
| 2026-06-07 12:00 |
12:03:16.84 |
-28:04:04.8 |
HIP 58759 |
11.87 |
| 2026-06-08 00:00 |
12:03:16.11 |
-28:03:45.1 |
HIP 58759 |
12.15 |
| 2026-06-08 12:00 |
12:03:15.40 |
-28:03:25.4 |
HIP 58759 |
12.43 |
| 2026-06-09 00:00 |
12:03:14.71 |
-28:03:05.9 |
HIP 58759 |
12.71 |
| 2026-06-09 12:00 |
12:03:14.04 |
-28:02:46.4 |
HIP 58759 |
13.00 |
| 2026-06-10 00:00 |
12:03:13.39 |
-28:02:27.0 |
HIP 58759 |
13.29 |
| 2026-06-10 12:00 |
12:03:12.76 |
-28:02:07.7 |
HIP 58759 |
13.58 |
| 2026-06-11 00:00 |
12:03:12.16 |
-28:01:48.4 |
HIP 58759 |
13.88 |
| 2026-06-11 12:00 |
12:03:11.57 |
-28:01:29.2 |
HIP 58759 |
14.18 |
| 2026-06-12 00:00 |
12:03:11.01 |
-28:01:10.2 |
HIP 58759 |
14.47 |
| 2026-06-12 12:00 |
12:03:10.46 |
-28:00:51.2 |
HIP 58759 |
14.77 |
| 2026-06-13 00:00 |
12:03:09.94 |
-28:00:32.3 |
HIP 58759 |
15.07 |
| 2026-06-13 12:00 |
12:03:09.44 |
-28:00:13.5 |
HIP 58759 |
15.37 |
| 2026-06-14 00:00 |
12:03:08.95 |
-27:59:54.7 |
HIP 58759 |
15.67 |
| 2026-06-14 12:00 |
12:03:08.49 |
-27:59:36.1 |
HIP 58759 |
15.97 |
| 2026-06-15 00:00 |
12:03:08.05 |
-27:59:17.6 |
HIP 58759 |
16.27 |
| 2026-06-15 12:00 |
12:03:07.63 |
-27:58:59.1 |
HIP 58759 |
16.57 |
| 2026-06-16 00:00 |
12:03:07.24 |
-27:58:40.8 |
HIP 58759 |
16.87 |
| 2026-06-16 12:00 |
12:03:06.86 |
-27:58:22.5 |
HIP 58759 |
17.17 |
| 2026-06-17 00:00 |
12:03:06.50 |
-27:58:04.3 |
HIP 58759 |
17.47 |
| 2026-06-17 12:00 |
12:03:06.17 |
-27:57:46.3 |
HIP 58759 |
17.76 |
| 2026-06-18 00:00 |
12:03:05.85 |
-27:57:28.3 |
HIP 58759 |
18.06 |
| 2026-06-18 12:00 |
12:03:05.56 |
-27:57:10.5 |
HIP 58759 |
18.36 |
| 2026-06-19 00:00 |
12:03:05.29 |
-27:56:52.7 |
HIP 58759 |
18.65 |
| 2026-06-19 12:00 |
12:03:05.03 |
-27:56:35.1 |
HIP 58759 |
18.94 |
| 2026-06-20 00:00 |
12:03:04.80 |
-27:56:17.5 |
HIP 58759 |
19.23 |
| 2026-06-20 12:00 |
12:03:04.59 |
-27:56:00.1 |
HIP 58759 |
19.52 |
| 2026-06-21 00:00 |
12:03:04.40 |
-27:55:42.8 |
HIP 58759 |
19.81 |
| 2026-06-21 12:00 |
12:03:04.23 |
-27:55:25.6 |
HIP 58689 |
20.01 |
| 2026-06-22 00:00 |
12:03:04.09 |
-27:55:08.4 |
HIP 58689 |
19.75 |