メタデータ
| 項目 |
値 |
| Designation |
264P/Larsen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2004-03-13T06:19:55.698240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:10Z |
| Obs used |
112 |
| NEO |
- |
| M1 |
16.700 |
| 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) |
2005-11-25.0000000 |
| e |
0.37373545 |
| q (au) |
2.438280 |
| a (au) |
3.893371 |
| i (deg) |
25.148268 |
| Ω (om, deg) |
220.967548 |
| ω (w, deg) |
346.619062 |
| M (ma, deg) |
79.766687 |
等級
散乱 + 全体線形
$$
M_a = (11.735 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.735 |
| n |
6.000 |
| 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
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) |
| 2026-05-12 00:00 |
07:18:05.49 |
-01:00:21.1 |
HIP 35499 |
22.67 |
| 2026-05-12 12:00 |
07:18:39.38 |
-00:59:15.2 |
HIP 35499 |
14.25 |
| 2026-05-13 00:00 |
07:19:13.41 |
-00:58:10.7 |
HIP 35499 |
6.14 |
| 2026-05-13 12:00 |
07:19:47.59 |
-00:57:07.6 |
HIP 35499 |
4.47 |
| 2026-05-14 00:00 |
07:20:21.91 |
-00:56:06.0 |
HIP 35598 |
8.08 |
| 2026-05-14 12:00 |
07:20:56.38 |
-00:55:05.8 |
HIP 35598 |
4.97 |
| 2026-05-15 00:00 |
07:21:31.00 |
-00:54:07.0 |
HIP 35598 |
11.65 |
| 2026-05-15 12:00 |
07:22:05.76 |
-00:53:09.6 |
HIP 35598 |
20.00 |
| 2026-05-16 00:00 |
07:22:40.65 |
-00:52:13.8 |
HIP 35598 |
28.62 |
| 2026-05-16 12:00 |
07:23:15.69 |
-00:51:19.3 |
HIP 35959 |
32.54 |
| 2026-05-17 00:00 |
07:23:50.87 |
-00:50:26.3 |
HIP 35959 |
27.93 |
| 2026-05-17 12:00 |
07:24:26.19 |
-00:49:34.8 |
HIP 35959 |
25.60 |
| 2026-05-18 00:00 |
07:25:01.64 |
-00:48:44.7 |
HIP 35959 |
26.22 |
| 2026-05-18 12:00 |
07:25:37.23 |
-00:47:56.0 |
HIP 36130 |
24.36 |
| 2026-05-19 00:00 |
07:26:12.95 |
-00:47:08.9 |
HIP 36130 |
19.71 |
| 2026-05-19 12:00 |
07:26:48.81 |
-00:46:23.1 |
HIP 36130 |
18.58 |
| 2026-05-20 00:00 |
07:27:24.80 |
-00:45:38.9 |
HIP 36130 |
21.58 |
| 2026-05-20 12:00 |
07:28:00.92 |
-00:44:56.1 |
HIP 36130 |
27.41 |
| 2026-05-21 00:00 |
07:28:37.16 |
-00:44:14.8 |
HIP 36495 |
29.11 |
| 2026-05-21 12:00 |
07:29:13.54 |
-00:43:34.9 |
HIP 36495 |
20.14 |
| 2026-05-22 00:00 |
07:29:50.04 |
-00:42:56.5 |
HIP 36495 |
11.39 |
| 2026-05-22 12:00 |
07:30:26.67 |
-00:42:19.5 |
HIP 36495 |
4.62 |
| 2026-05-23 00:00 |
07:31:03.42 |
-00:41:44.1 |
HIP 36495 |
9.06 |
| 2026-05-23 12:00 |
07:31:40.30 |
-00:41:10.1 |
HIP 36659 |
15.31 |
| 2026-05-24 00:00 |
07:32:17.29 |
-00:40:37.5 |
HIP 36659 |
9.79 |
| 2026-05-24 12:00 |
07:32:54.41 |
-00:40:06.4 |
HIP 36659 |
11.40 |
| 2026-05-25 00:00 |
07:33:31.65 |
-00:39:36.8 |
HIP 36659 |
18.39 |
| 2026-05-25 12:00 |
07:34:09.01 |
-00:39:08.6 |
HIP 36659 |
26.88 |
| 2026-05-26 00:00 |
07:34:46.48 |
-00:38:41.9 |
HIP 36659 |
35.83 |
| 2026-05-26 12:00 |
07:35:24.08 |
-00:38:16.7 |
HIP 36989 |
32.31 |
| 2026-05-27 00:00 |
07:36:01.78 |
-00:37:52.9 |
HIP 36989 |
29.74 |
| 2026-05-27 12:00 |
07:36:39.61 |
-00:37:30.6 |
HIP 36989 |
30.08 |
| 2026-05-28 00:00 |
07:37:17.54 |
-00:37:09.8 |
HIP 37243 |
32.85 |
| 2026-05-28 12:00 |
07:37:55.59 |
-00:36:50.4 |
HIP 37243 |
26.15 |
| 2026-05-29 00:00 |
07:38:33.75 |
-00:36:32.4 |
HIP 37243 |
21.69 |
| 2026-05-29 12:00 |
07:39:12.03 |
-00:36:16.0 |
HIP 37243 |
20.99 |
| 2026-05-30 00:00 |
07:39:50.41 |
-00:36:01.0 |
HIP 37422 |
17.27 |
| 2026-05-30 12:00 |
07:40:28.90 |
-00:35:47.4 |
HIP 37422 |
9.11 |
| 2026-05-31 00:00 |
07:41:07.50 |
-00:35:35.3 |
HIP 37422 |
7.25 |
| 2026-05-31 12:00 |
07:41:46.21 |
-00:35:24.7 |
HIP 37422 |
14.46 |
| 2026-06-01 00:00 |
07:42:25.03 |
-00:35:15.5 |
HIP 37553 |
13.80 |
| 2026-06-01 12:00 |
07:43:03.95 |
-00:35:07.8 |
HIP 37553 |
16.90 |
| 2026-06-02 00:00 |
07:43:42.98 |
-00:35:01.5 |
HIP 37553 |
23.88 |