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) |
| 2026-05-12 00:00 |
05:40:50.31 |
+14:29:51.0 |
HIP 26647 |
23.58 |
| 2026-05-12 12:00 |
05:40:52.38 |
+14:29:53.6 |
HIP 26647 |
23.87 |
| 2026-05-13 00:00 |
05:40:54.47 |
+14:29:56.2 |
HIP 26647 |
24.17 |
| 2026-05-13 12:00 |
05:40:56.56 |
+14:29:58.8 |
HIP 26647 |
24.48 |
| 2026-05-14 00:00 |
05:40:58.67 |
+14:30:01.3 |
HIP 26647 |
24.79 |
| 2026-05-14 12:00 |
05:41:00.79 |
+14:30:03.8 |
HIP 26647 |
25.12 |
| 2026-05-15 00:00 |
05:41:02.92 |
+14:30:06.3 |
HIP 26647 |
25.46 |
| 2026-05-15 12:00 |
05:41:05.06 |
+14:30:08.7 |
HIP 26647 |
25.80 |
| 2026-05-16 00:00 |
05:41:07.21 |
+14:30:11.1 |
HIP 26647 |
26.15 |
| 2026-05-16 12:00 |
05:41:09.37 |
+14:30:13.4 |
HIP 26647 |
26.51 |
| 2026-05-17 00:00 |
05:41:11.54 |
+14:30:15.8 |
HIP 26647 |
26.88 |
| 2026-05-17 12:00 |
05:41:13.72 |
+14:30:18.0 |
HIP 26647 |
27.25 |
| 2026-05-18 00:00 |
05:41:15.91 |
+14:30:20.3 |
HIP 26647 |
27.64 |
| 2026-05-18 12:00 |
05:41:18.11 |
+14:30:22.5 |
HIP 26647 |
28.02 |
| 2026-05-19 00:00 |
05:41:20.31 |
+14:30:24.6 |
HIP 26647 |
28.42 |
| 2026-05-19 12:00 |
05:41:22.53 |
+14:30:26.7 |
HIP 26647 |
28.82 |
| 2026-05-20 00:00 |
05:41:24.76 |
+14:30:28.8 |
HIP 26647 |
29.23 |
| 2026-05-20 12:00 |
05:41:27.00 |
+14:30:30.9 |
HIP 26647 |
29.65 |
| 2026-05-21 00:00 |
05:41:29.24 |
+14:30:32.9 |
HIP 26930 |
29.27 |
| 2026-05-21 12:00 |
05:41:31.49 |
+14:30:34.8 |
HIP 26930 |
28.89 |
| 2026-05-22 00:00 |
05:41:33.76 |
+14:30:36.7 |
HIP 26930 |
28.52 |
| 2026-05-22 12:00 |
05:41:36.03 |
+14:30:38.6 |
HIP 26930 |
28.15 |
| 2026-05-23 00:00 |
05:41:38.31 |
+14:30:40.5 |
HIP 26930 |
27.79 |
| 2026-05-23 12:00 |
05:41:40.59 |
+14:30:42.3 |
HIP 26930 |
27.43 |
| 2026-05-24 00:00 |
05:41:42.89 |
+14:30:44.0 |
HIP 26930 |
27.07 |
| 2026-05-24 12:00 |
05:41:45.19 |
+14:30:45.8 |
HIP 26930 |
26.72 |
| 2026-05-25 00:00 |
05:41:47.50 |
+14:30:47.4 |
HIP 26930 |
26.37 |
| 2026-05-25 12:00 |
05:41:49.81 |
+14:30:49.1 |
HIP 26930 |
26.04 |
| 2026-05-26 00:00 |
05:41:52.14 |
+14:30:50.7 |
HIP 26930 |
25.70 |
| 2026-05-26 12:00 |
05:41:54.47 |
+14:30:52.2 |
HIP 26930 |
25.38 |
| 2026-05-27 00:00 |
05:41:56.81 |
+14:30:53.7 |
HIP 26930 |
25.06 |
| 2026-05-27 12:00 |
05:41:59.15 |
+14:30:55.2 |
HIP 26930 |
24.74 |
| 2026-05-28 00:00 |
05:42:01.50 |
+14:30:56.6 |
HIP 26930 |
24.44 |
| 2026-05-28 12:00 |
05:42:03.86 |
+14:30:58.0 |
HIP 26930 |
24.14 |
| 2026-05-29 00:00 |
05:42:06.22 |
+14:30:59.4 |
HIP 26930 |
23.86 |
| 2026-05-29 12:00 |
05:42:08.59 |
+14:31:00.7 |
HIP 26930 |
23.58 |
| 2026-05-30 00:00 |
05:42:10.97 |
+14:31:01.9 |
HIP 26930 |
23.31 |
| 2026-05-30 12:00 |
05:42:13.35 |
+14:31:03.2 |
HIP 26930 |
23.05 |
| 2026-05-31 00:00 |
05:42:15.73 |
+14:31:04.3 |
HIP 26930 |
22.80 |
| 2026-05-31 12:00 |
05:42:18.13 |
+14:31:05.5 |
HIP 26930 |
22.56 |
| 2026-06-01 00:00 |
05:42:20.53 |
+14:31:06.6 |
HIP 26930 |
22.34 |
| 2026-06-01 12:00 |
05:42:22.93 |
+14:31:07.6 |
HIP 26930 |
22.12 |
| 2026-06-02 00:00 |
05:42:25.34 |
+14:31:08.6 |
HIP 26930 |
21.92 |