メタデータ
| 項目 |
値 |
| Designation |
280P/Larsen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-12-11T05:00:01.716480Z |
| Orbit solution date (soln_date, UTC) |
2024-09-11T13:42:29Z |
| Obs used |
166 |
| NEO |
- |
| M1 |
15.200 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-07-09.0000000 |
| e |
0.41769582 |
| q (au) |
2.627996 |
| a (au) |
4.513099 |
| i (deg) |
11.779921 |
| Ω (om, deg) |
131.491111 |
| ω (w, deg) |
104.855623 |
| M (ma, deg) |
193.854280 |
等級
散乱 + 全体線形
$$
M_a = (14.700 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.700 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.998 |
| δ90 |
9.629 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
01:50:55.55 |
+01:01:06.5 |
HIP 8639 |
14.00 |
| 2026-06-01 12:00 |
01:51:14.72 |
+01:02:14.9 |
HIP 8639 |
13.25 |
| 2026-06-02 00:00 |
01:51:33.83 |
+01:03:22.5 |
HIP 8639 |
14.26 |
| 2026-06-02 12:00 |
01:51:52.86 |
+01:04:29.3 |
HIP 8756 |
15.69 |
| 2026-06-03 00:00 |
01:52:11.82 |
+01:05:35.4 |
HIP 8756 |
11.80 |
| 2026-06-03 12:00 |
01:52:30.72 |
+01:06:40.7 |
HIP 8756 |
8.94 |
| 2026-06-04 00:00 |
01:52:49.54 |
+01:07:45.2 |
HIP 8756 |
8.22 |
| 2026-06-04 12:00 |
01:53:08.29 |
+01:08:49.0 |
HIP 8756 |
10.09 |
| 2026-06-05 00:00 |
01:53:26.97 |
+01:09:52.0 |
HIP 8756 |
13.49 |
| 2026-06-05 12:00 |
01:53:45.57 |
+01:10:54.2 |
HIP 8756 |
17.53 |
| 2026-06-06 00:00 |
01:54:04.10 |
+01:11:55.6 |
HIP 8756 |
21.85 |
| 2026-06-06 12:00 |
01:54:22.56 |
+01:12:56.2 |
HIP 8756 |
26.30 |
| 2026-06-07 00:00 |
01:54:40.94 |
+01:13:56.0 |
HIP 8756 |
30.81 |
| 2026-06-07 12:00 |
01:54:59.25 |
+01:14:55.1 |
HIP 9062 |
34.36 |
| 2026-06-08 00:00 |
01:55:17.48 |
+01:15:53.3 |
HIP 9062 |
30.44 |
| 2026-06-08 12:00 |
01:55:35.63 |
+01:16:50.8 |
HIP 9062 |
26.79 |
| 2026-06-09 00:00 |
01:55:53.71 |
+01:17:47.4 |
HIP 9062 |
23.50 |
| 2026-06-09 12:00 |
01:56:11.70 |
+01:18:43.3 |
HIP 9062 |
20.74 |
| 2026-06-10 00:00 |
01:56:29.62 |
+01:19:38.3 |
HIP 9062 |
18.74 |
| 2026-06-10 12:00 |
01:56:47.45 |
+01:20:32.5 |
HIP 9062 |
17.72 |
| 2026-06-11 00:00 |
01:57:05.21 |
+01:21:25.9 |
HIP 9062 |
17.85 |
| 2026-06-11 12:00 |
01:57:22.88 |
+01:22:18.5 |
HIP 9062 |
19.09 |
| 2026-06-12 00:00 |
01:57:40.47 |
+01:23:10.2 |
HIP 9062 |
21.22 |
| 2026-06-12 12:00 |
01:57:57.98 |
+01:24:01.1 |
HIP 9274 |
22.30 |
| 2026-06-13 00:00 |
01:58:15.40 |
+01:24:51.2 |
HIP 9274 |
18.34 |
| 2026-06-13 12:00 |
01:58:32.74 |
+01:25:40.5 |
HIP 9274 |
14.67 |
| 2026-06-14 00:00 |
01:58:49.99 |
+01:26:28.9 |
HIP 9274 |
11.56 |
| 2026-06-14 12:00 |
01:59:07.16 |
+01:27:16.4 |
HIP 9274 |
9.52 |
| 2026-06-15 00:00 |
01:59:24.24 |
+01:28:03.2 |
HIP 9274 |
9.27 |
| 2026-06-15 12:00 |
01:59:41.23 |
+01:28:49.1 |
HIP 9274 |
10.90 |
| 2026-06-16 00:00 |
01:59:58.13 |
+01:29:34.1 |
HIP 9274 |
13.73 |
| 2026-06-16 12:00 |
02:00:14.94 |
+01:30:18.3 |
HIP 9274 |
17.17 |
| 2026-06-17 00:00 |
02:00:31.66 |
+01:31:01.6 |
HIP 9457 |
19.88 |
| 2026-06-17 12:00 |
02:00:48.29 |
+01:31:44.1 |
HIP 9457 |
16.94 |
| 2026-06-18 00:00 |
02:01:04.82 |
+01:32:25.7 |
HIP 9457 |
14.65 |
| 2026-06-18 12:00 |
02:01:21.27 |
+01:33:06.4 |
HIP 9457 |
13.31 |
| 2026-06-19 00:00 |
02:01:37.62 |
+01:33:46.3 |
HIP 9457 |
13.19 |
| 2026-06-19 12:00 |
02:01:53.87 |
+01:34:25.4 |
HIP 9457 |
14.30 |
| 2026-06-20 00:00 |
02:02:10.03 |
+01:35:03.5 |
HIP 9457 |
16.38 |
| 2026-06-20 12:00 |
02:02:26.10 |
+01:35:40.8 |
HIP 9612 |
16.86 |
| 2026-06-21 00:00 |
02:02:42.07 |
+01:36:17.3 |
HIP 9612 |
12.85 |
| 2026-06-21 12:00 |
02:02:57.94 |
+01:36:52.8 |
HIP 9612 |
8.88 |
| 2026-06-22 00:00 |
02:03:13.72 |
+01:37:27.5 |
HIP 9612 |
5.01 |