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) |
| 2026-09-20 00:00 |
04:25:12.93 |
+24:52:15.2 |
HIP 20604 |
32.84 |
| 2026-09-20 12:00 |
04:25:12.15 |
+24:52:14.8 |
HIP 20604 |
32.82 |
| 2026-09-21 00:00 |
04:25:11.35 |
+24:52:14.3 |
HIP 20604 |
32.79 |
| 2026-09-21 12:00 |
04:25:10.52 |
+24:52:13.7 |
HIP 20604 |
32.77 |
| 2026-09-22 00:00 |
04:25:09.68 |
+24:52:13.1 |
HIP 20604 |
32.75 |
| 2026-09-22 12:00 |
04:25:08.81 |
+24:52:12.5 |
HIP 20604 |
32.73 |
| 2026-09-23 00:00 |
04:25:07.92 |
+24:52:11.8 |
HIP 20604 |
32.71 |
| 2026-09-23 12:00 |
04:25:07.01 |
+24:52:11.0 |
HIP 20604 |
32.70 |
| 2026-09-24 00:00 |
04:25:06.08 |
+24:52:10.2 |
HIP 20604 |
32.68 |
| 2026-09-24 12:00 |
04:25:05.12 |
+24:52:09.3 |
HIP 20604 |
32.67 |
| 2026-09-25 00:00 |
04:25:04.15 |
+24:52:08.4 |
HIP 20604 |
32.66 |
| 2026-09-25 12:00 |
04:25:03.15 |
+24:52:07.4 |
HIP 20604 |
32.65 |
| 2026-09-26 00:00 |
04:25:02.13 |
+24:52:06.4 |
HIP 20604 |
32.64 |
| 2026-09-26 12:00 |
04:25:01.09 |
+24:52:05.3 |
HIP 20604 |
32.63 |
| 2026-09-27 00:00 |
04:25:00.03 |
+24:52:04.2 |
HIP 20604 |
32.63 |
| 2026-09-27 12:00 |
04:24:58.95 |
+24:52:03.0 |
HIP 20604 |
32.63 |
| 2026-09-28 00:00 |
04:24:57.85 |
+24:52:01.7 |
HIP 20604 |
32.63 |
| 2026-09-28 12:00 |
04:24:56.73 |
+24:52:00.4 |
HIP 20604 |
32.63 |
| 2026-09-29 00:00 |
04:24:55.58 |
+24:51:59.1 |
HIP 20604 |
32.64 |
| 2026-09-29 12:00 |
04:24:54.42 |
+24:51:57.7 |
HIP 20604 |
32.65 |
| 2026-09-30 00:00 |
04:24:53.23 |
+24:51:56.2 |
HIP 20604 |
32.66 |
| 2026-09-30 12:00 |
04:24:52.03 |
+24:51:54.7 |
HIP 20604 |
32.68 |
| 2026-10-01 00:00 |
04:24:50.80 |
+24:51:53.1 |
HIP 20604 |
32.69 |
| 2026-10-01 12:00 |
04:24:49.55 |
+24:51:51.5 |
HIP 20604 |
32.72 |
| 2026-10-02 00:00 |
04:24:48.29 |
+24:51:49.8 |
HIP 20491 |
32.71 |
| 2026-10-02 12:00 |
04:24:47.00 |
+24:51:48.0 |
HIP 20491 |
32.53 |
| 2026-10-03 00:00 |
04:24:45.69 |
+24:51:46.3 |
HIP 20491 |
32.34 |
| 2026-10-03 12:00 |
04:24:44.36 |
+24:51:44.4 |
HIP 20491 |
32.16 |
| 2026-10-04 00:00 |
04:24:43.02 |
+24:51:42.5 |
HIP 20491 |
31.97 |
| 2026-10-04 12:00 |
04:24:41.65 |
+24:51:40.5 |
HIP 20491 |
31.79 |
| 2026-10-05 00:00 |
04:24:40.26 |
+24:51:38.5 |
HIP 20491 |
31.60 |
| 2026-10-05 12:00 |
04:24:38.85 |
+24:51:36.5 |
HIP 20491 |
31.41 |
| 2026-10-06 00:00 |
04:24:37.42 |
+24:51:34.3 |
HIP 20491 |
31.22 |
| 2026-10-06 12:00 |
04:24:35.98 |
+24:51:32.2 |
HIP 20491 |
31.03 |
| 2026-10-07 00:00 |
04:24:34.51 |
+24:51:29.9 |
HIP 20491 |
30.83 |
| 2026-10-07 12:00 |
04:24:33.02 |
+24:51:27.7 |
HIP 20491 |
30.64 |
| 2026-10-08 00:00 |
04:24:31.52 |
+24:51:25.3 |
HIP 20491 |
30.45 |
| 2026-10-08 12:00 |
04:24:29.99 |
+24:51:22.9 |
HIP 20491 |
30.26 |
| 2026-10-09 00:00 |
04:24:28.45 |
+24:51:20.5 |
HIP 20491 |
30.07 |
| 2026-10-09 12:00 |
04:24:26.88 |
+24:51:18.0 |
HIP 20491 |
29.87 |
| 2026-10-10 00:00 |
04:24:25.30 |
+24:51:15.4 |
HIP 20491 |
29.68 |
| 2026-10-10 12:00 |
04:24:23.70 |
+24:51:12.8 |
HIP 20491 |
29.49 |
| 2026-10-11 00:00 |
04:24:22.08 |
+24:51:10.2 |
HIP 20491 |
29.30 |