メタデータ
| 項目 |
値 |
| Designation |
C/1998 M2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-08-13T04:08:09.286080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
386 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
11.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-08-18.0000000 |
| e |
0.99775644 |
| q (au) |
2.725333 |
| a (au) |
1214.736178 |
| i (deg) |
60.182314 |
| Ω (om, deg) |
260.880195 |
| ω (w, deg) |
37.242994 |
| M (ma, deg) |
0.000112 |
等級
散乱 + 全体線形
$$
M_a = (6.569 + 5.036\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.569 |
| n |
5.036 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-07-29 00:00 |
05:46:52.86 |
+14:27:56.8 |
HIP 27316 |
5.10 |
| 2026-07-29 12:00 |
05:46:54.79 |
+14:27:52.4 |
HIP 27316 |
4.67 |
| 2026-07-30 00:00 |
05:46:56.72 |
+14:27:48.1 |
HIP 27316 |
4.25 |
| 2026-07-30 12:00 |
05:46:58.63 |
+14:27:43.7 |
HIP 27316 |
3.85 |
| 2026-07-31 00:00 |
05:47:00.54 |
+14:27:39.2 |
HIP 27316 |
3.47 |
| 2026-07-31 12:00 |
05:47:02.42 |
+14:27:34.7 |
HIP 27316 |
3.12 |
| 2026-08-01 00:00 |
05:47:04.30 |
+14:27:30.2 |
HIP 27316 |
2.80 |
| 2026-08-01 12:00 |
05:47:06.16 |
+14:27:25.6 |
HIP 27316 |
2.53 |
| 2026-08-02 00:00 |
05:47:08.01 |
+14:27:21.0 |
HIP 27316 |
2.32 |
| 2026-08-02 12:00 |
05:47:09.84 |
+14:27:16.3 |
HIP 27316 |
2.19 |
| 2026-08-03 00:00 |
05:47:11.66 |
+14:27:11.6 |
HIP 27316 |
2.14 |
| 2026-08-03 12:00 |
05:47:13.47 |
+14:27:06.9 |
HIP 27316 |
2.19 |
| 2026-08-04 00:00 |
05:47:15.26 |
+14:27:02.1 |
HIP 27316 |
2.33 |
| 2026-08-04 12:00 |
05:47:17.04 |
+14:26:57.3 |
HIP 27316 |
2.53 |
| 2026-08-05 00:00 |
05:47:18.81 |
+14:26:52.4 |
HIP 27316 |
2.79 |
| 2026-08-05 12:00 |
05:47:20.56 |
+14:26:47.5 |
HIP 27316 |
3.09 |
| 2026-08-06 00:00 |
05:47:22.30 |
+14:26:42.6 |
HIP 27316 |
3.41 |
| 2026-08-06 12:00 |
05:47:24.02 |
+14:26:37.6 |
HIP 27316 |
3.75 |
| 2026-08-07 00:00 |
05:47:25.73 |
+14:26:32.6 |
HIP 27316 |
4.11 |
| 2026-08-07 12:00 |
05:47:27.42 |
+14:26:27.5 |
HIP 27316 |
4.48 |
| 2026-08-08 00:00 |
05:47:29.10 |
+14:26:22.5 |
HIP 27316 |
4.85 |
| 2026-08-08 12:00 |
05:47:30.76 |
+14:26:17.3 |
HIP 27316 |
5.22 |
| 2026-08-09 00:00 |
05:47:32.41 |
+14:26:12.2 |
HIP 27316 |
5.60 |
| 2026-08-09 12:00 |
05:47:34.04 |
+14:26:07.0 |
HIP 27316 |
5.98 |
| 2026-08-10 00:00 |
05:47:35.66 |
+14:26:01.7 |
HIP 27316 |
6.36 |
| 2026-08-10 12:00 |
05:47:37.26 |
+14:25:56.4 |
HIP 27316 |
6.74 |
| 2026-08-11 00:00 |
05:47:38.85 |
+14:25:51.1 |
HIP 27316 |
7.12 |
| 2026-08-11 12:00 |
05:47:40.42 |
+14:25:45.8 |
HIP 27316 |
7.49 |
| 2026-08-12 00:00 |
05:47:41.97 |
+14:25:40.4 |
HIP 27316 |
7.87 |
| 2026-08-12 12:00 |
05:47:43.51 |
+14:25:34.9 |
HIP 27316 |
8.24 |
| 2026-08-13 00:00 |
05:47:45.03 |
+14:25:29.5 |
HIP 27316 |
8.61 |
| 2026-08-13 12:00 |
05:47:46.54 |
+14:25:24.0 |
HIP 27316 |
8.98 |
| 2026-08-14 00:00 |
05:47:48.02 |
+14:25:18.4 |
HIP 27316 |
9.34 |
| 2026-08-14 12:00 |
05:47:49.50 |
+14:25:12.9 |
HIP 27316 |
9.70 |
| 2026-08-15 00:00 |
05:47:50.95 |
+14:25:07.3 |
HIP 27316 |
10.06 |
| 2026-08-15 12:00 |
05:47:52.39 |
+14:25:01.6 |
HIP 27316 |
10.42 |
| 2026-08-16 00:00 |
05:47:53.81 |
+14:24:56.0 |
HIP 27316 |
10.77 |
| 2026-08-16 12:00 |
05:47:55.22 |
+14:24:50.3 |
HIP 27316 |
11.12 |
| 2026-08-17 00:00 |
05:47:56.61 |
+14:24:44.5 |
HIP 27316 |
11.47 |
| 2026-08-17 12:00 |
05:47:57.98 |
+14:24:38.8 |
HIP 27316 |
11.81 |
| 2026-08-18 00:00 |
05:47:59.33 |
+14:24:33.0 |
HIP 27316 |
12.15 |
| 2026-08-18 12:00 |
05:48:00.67 |
+14:24:27.1 |
HIP 27316 |
12.49 |
| 2026-08-19 00:00 |
05:48:01.99 |
+14:24:21.3 |
HIP 27316 |
12.82 |