メタデータ
| 項目 |
値 |
| Designation |
C/1998 M3 (Larsen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-07-17T02:37:10.369920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
109 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-08-29.0000000 |
| e |
1.00229380 |
| q (au) |
5.768232 |
| a (au) |
-2514.702905 |
| i (deg) |
113.422897 |
| Ω (om, deg) |
255.526698 |
| ω (w, deg) |
20.838100 |
| M (ma, deg) |
0.000335 |
等級
散乱 + 全体線形
$$
M_a = (2.182 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.182 |
| n |
6.000 |
| gf |
0.963 |
| gb |
-1.000 |
| 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 |
05:25:32.88 |
+41:36:20.7 |
HIP 25284 |
17.65 |
| 2026-05-12 12:00 |
05:25:35.61 |
+41:36:13.9 |
HIP 25284 |
18.08 |
| 2026-05-13 00:00 |
05:25:38.35 |
+41:36:07.1 |
HIP 25284 |
18.51 |
| 2026-05-13 12:00 |
05:25:41.11 |
+41:36:00.4 |
HIP 25284 |
18.95 |
| 2026-05-14 00:00 |
05:25:43.88 |
+41:35:53.8 |
HIP 25284 |
19.39 |
| 2026-05-14 12:00 |
05:25:46.67 |
+41:35:47.3 |
HIP 25284 |
19.83 |
| 2026-05-15 00:00 |
05:25:49.47 |
+41:35:40.8 |
HIP 25284 |
20.28 |
| 2026-05-15 12:00 |
05:25:52.28 |
+41:35:34.5 |
HIP 25284 |
20.74 |
| 2026-05-16 00:00 |
05:25:55.10 |
+41:35:28.3 |
HIP 25284 |
21.20 |
| 2026-05-16 12:00 |
05:25:57.94 |
+41:35:22.2 |
HIP 25284 |
21.66 |
| 2026-05-17 00:00 |
05:26:00.79 |
+41:35:16.1 |
HIP 25284 |
22.13 |
| 2026-05-17 12:00 |
05:26:03.64 |
+41:35:10.2 |
HIP 25284 |
22.60 |
| 2026-05-18 00:00 |
05:26:06.52 |
+41:35:04.3 |
HIP 25284 |
23.08 |
| 2026-05-18 12:00 |
05:26:09.40 |
+41:34:58.6 |
HIP 25284 |
23.56 |
| 2026-05-19 00:00 |
05:26:12.29 |
+41:34:52.9 |
HIP 25284 |
24.04 |
| 2026-05-19 12:00 |
05:26:15.19 |
+41:34:47.3 |
HIP 25284 |
24.53 |
| 2026-05-20 00:00 |
05:26:18.11 |
+41:34:41.9 |
HIP 25284 |
25.02 |
| 2026-05-20 12:00 |
05:26:21.03 |
+41:34:36.5 |
HIP 25284 |
25.51 |
| 2026-05-21 00:00 |
05:26:23.97 |
+41:34:31.2 |
HIP 25284 |
26.01 |
| 2026-05-21 12:00 |
05:26:26.91 |
+41:34:26.0 |
HIP 25284 |
26.51 |
| 2026-05-22 00:00 |
05:26:29.87 |
+41:34:20.9 |
HIP 25284 |
27.01 |
| 2026-05-22 12:00 |
05:26:32.83 |
+41:34:15.9 |
HIP 25284 |
27.51 |
| 2026-05-23 00:00 |
05:26:35.81 |
+41:34:11.0 |
HIP 25284 |
28.02 |
| 2026-05-23 12:00 |
05:26:38.79 |
+41:34:06.2 |
HIP 25284 |
28.53 |
| 2026-05-24 00:00 |
05:26:41.78 |
+41:34:01.5 |
HIP 25284 |
29.04 |
| 2026-05-24 12:00 |
05:26:44.78 |
+41:33:56.9 |
HIP 25284 |
29.56 |
| 2026-05-25 00:00 |
05:26:47.79 |
+41:33:52.4 |
HIP 25284 |
30.08 |
| 2026-05-25 12:00 |
05:26:50.80 |
+41:33:47.9 |
HIP 25284 |
30.59 |
| 2026-05-26 00:00 |
05:26:53.83 |
+41:33:43.6 |
HIP 25284 |
31.12 |
| 2026-05-26 12:00 |
05:26:56.86 |
+41:33:39.4 |
HIP 25284 |
31.64 |
| 2026-05-27 00:00 |
05:26:59.90 |
+41:33:35.2 |
HIP 25284 |
32.17 |
| 2026-05-27 12:00 |
05:27:02.95 |
+41:33:31.2 |
HIP 25284 |
32.69 |
| 2026-05-28 00:00 |
05:27:06.00 |
+41:33:27.2 |
HIP 25284 |
33.22 |
| 2026-05-28 12:00 |
05:27:09.06 |
+41:33:23.3 |
HIP 25284 |
33.75 |
| 2026-05-29 00:00 |
05:27:12.13 |
+41:33:19.6 |
HIP 25284 |
34.29 |
| 2026-05-29 12:00 |
05:27:15.21 |
+41:33:15.9 |
HIP 25284 |
34.82 |
| 2026-05-30 00:00 |
05:27:18.29 |
+41:33:12.3 |
HIP 25284 |
35.36 |
| 2026-05-30 12:00 |
05:27:21.37 |
+41:33:08.8 |
HIP 25284 |
35.90 |
| 2026-05-31 00:00 |
05:27:24.47 |
+41:33:05.5 |
HIP 25773 |
35.50 |
| 2026-05-31 12:00 |
05:27:27.57 |
+41:33:02.2 |
HIP 25773 |
34.96 |
| 2026-06-01 00:00 |
05:27:30.67 |
+41:32:59.0 |
HIP 25773 |
34.42 |
| 2026-06-01 12:00 |
05:27:33.78 |
+41:32:55.9 |
HIP 25773 |
33.88 |
| 2026-06-02 00:00 |
05:27:36.90 |
+41:32:52.8 |
HIP 25773 |
33.34 |