メタデータ
| 項目 |
値 |
| Designation |
C/1998 M1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-10-28T02:41:20.860800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
191 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
14.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-09-21.0000000 |
| e |
0.99276578 |
| q (au) |
3.118124 |
| a (au) |
431.024098 |
| i (deg) |
20.384564 |
| Ω (om, deg) |
256.067464 |
| ω (w, deg) |
19.403420 |
| M (ma, deg) |
359.995912 |
等級
散乱 + 全体線形
$$
M_a = (5.198 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.198 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.501 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
04:20:04.13 |
+24:37:44.3 |
HIP 20047 |
29.03 |
| 2026-06-01 12:00 |
04:20:06.86 |
+24:37:50.1 |
HIP 20047 |
29.66 |
| 2026-06-02 00:00 |
04:20:09.59 |
+24:37:55.9 |
HIP 20047 |
30.29 |
| 2026-06-02 12:00 |
04:20:12.32 |
+24:38:01.7 |
HIP 20047 |
30.91 |
| 2026-06-03 00:00 |
04:20:15.05 |
+24:38:07.5 |
HIP 20047 |
31.54 |
| 2026-06-03 12:00 |
04:20:17.77 |
+24:38:13.3 |
HIP 20047 |
32.16 |
| 2026-06-04 00:00 |
04:20:20.50 |
+24:38:19.2 |
HIP 20047 |
32.79 |
| 2026-06-04 12:00 |
04:20:23.22 |
+24:38:25.0 |
HIP 20047 |
33.42 |
| 2026-06-05 00:00 |
04:20:25.93 |
+24:38:30.9 |
HIP 20047 |
34.04 |
| 2026-06-05 12:00 |
04:20:28.65 |
+24:38:36.7 |
HIP 20047 |
34.66 |
| 2026-06-06 00:00 |
04:20:31.36 |
+24:38:42.6 |
HIP 20047 |
35.29 |
| 2026-06-06 12:00 |
04:20:34.07 |
+24:38:48.4 |
HIP 20091 |
35.77 |
| 2026-06-07 00:00 |
04:20:36.78 |
+24:38:54.3 |
HIP 20091 |
36.21 |
| 2026-06-07 12:00 |
04:20:39.48 |
+24:39:00.2 |
HIP 20091 |
36.65 |
| 2026-06-08 00:00 |
04:20:42.18 |
+24:39:06.1 |
HIP 20091 |
37.09 |
| 2026-06-08 12:00 |
04:20:44.88 |
+24:39:12.0 |
HIP 20091 |
37.54 |
| 2026-06-09 00:00 |
04:20:47.57 |
+24:39:17.9 |
HIP 20091 |
37.99 |
| 2026-06-09 12:00 |
04:20:50.26 |
+24:39:23.8 |
HIP 20091 |
38.45 |
| 2026-06-10 00:00 |
04:20:52.94 |
+24:39:29.7 |
HIP 20491 |
38.88 |
| 2026-06-10 12:00 |
04:20:55.62 |
+24:39:35.6 |
HIP 20491 |
38.36 |
| 2026-06-11 00:00 |
04:20:58.30 |
+24:39:41.5 |
HIP 20491 |
37.84 |
| 2026-06-11 12:00 |
04:21:00.97 |
+24:39:47.4 |
HIP 20491 |
37.32 |
| 2026-06-12 00:00 |
04:21:03.63 |
+24:39:53.3 |
HIP 20491 |
36.81 |
| 2026-06-12 12:00 |
04:21:06.29 |
+24:39:59.3 |
HIP 20491 |
36.31 |
| 2026-06-13 00:00 |
04:21:08.95 |
+24:40:05.2 |
HIP 20491 |
35.81 |
| 2026-06-13 12:00 |
04:21:11.60 |
+24:40:11.1 |
HIP 20491 |
35.31 |
| 2026-06-14 00:00 |
04:21:14.25 |
+24:40:17.0 |
HIP 20491 |
34.82 |
| 2026-06-14 12:00 |
04:21:16.88 |
+24:40:22.9 |
HIP 20491 |
34.33 |
| 2026-06-15 00:00 |
04:21:19.52 |
+24:40:28.9 |
HIP 20491 |
33.85 |
| 2026-06-15 12:00 |
04:21:22.15 |
+24:40:34.8 |
HIP 20491 |
33.38 |
| 2026-06-16 00:00 |
04:21:24.77 |
+24:40:40.7 |
HIP 20491 |
32.91 |
| 2026-06-16 12:00 |
04:21:27.38 |
+24:40:46.6 |
HIP 20491 |
32.44 |
| 2026-06-17 00:00 |
04:21:29.99 |
+24:40:52.5 |
HIP 20491 |
31.98 |
| 2026-06-17 12:00 |
04:21:32.59 |
+24:40:58.4 |
HIP 20491 |
31.53 |
| 2026-06-18 00:00 |
04:21:35.18 |
+24:41:04.3 |
HIP 20491 |
31.08 |
| 2026-06-18 12:00 |
04:21:37.77 |
+24:41:10.3 |
HIP 20491 |
30.64 |
| 2026-06-19 00:00 |
04:21:40.35 |
+24:41:16.2 |
HIP 20491 |
30.21 |
| 2026-06-19 12:00 |
04:21:42.92 |
+24:41:22.0 |
HIP 20491 |
29.78 |
| 2026-06-20 00:00 |
04:21:45.48 |
+24:41:27.9 |
HIP 20491 |
29.36 |
| 2026-06-20 12:00 |
04:21:48.04 |
+24:41:33.8 |
HIP 20491 |
28.95 |
| 2026-06-21 00:00 |
04:21:50.59 |
+24:41:39.7 |
HIP 20491 |
28.55 |
| 2026-06-21 12:00 |
04:21:53.13 |
+24:41:45.6 |
HIP 20491 |
28.15 |
| 2026-06-22 00:00 |
04:21:55.66 |
+24:41:51.5 |
HIP 20491 |
27.76 |