メタデータ
| 項目 |
値 |
| Designation |
397P/Lemmon |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-06-19T12:25:57.619200Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:01:58Z |
| Obs used |
484 |
| NEO |
- |
| M1 |
15.500 |
| 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) |
2017-09-17.0000000 |
| e |
0.40063396 |
| q (au) |
2.313559 |
| a (au) |
3.860010 |
| i (deg) |
11.022023 |
| Ω (om, deg) |
8.973574 |
| ω (w, deg) |
12.487247 |
| M (ma, deg) |
229.189372 |
等級
散乱 + 全体線形
$$
M_a = (11.384 + 4.751\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.384 |
| n |
4.751 |
| gf |
0.999 |
| gb |
-0.503 |
| 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) |
| 2026-06-01 00:00 |
17:39:32.91 |
-37:12:01.9 |
HIP 86461 |
5.37 |
| 2026-06-01 12:00 |
17:39:08.94 |
-37:12:44.6 |
HIP 86461 |
9.78 |
| 2026-06-02 00:00 |
17:38:44.80 |
-37:13:25.9 |
HIP 86418 |
12.17 |
| 2026-06-02 12:00 |
17:38:20.50 |
-37:14:05.9 |
HIP 86418 |
15.66 |
| 2026-06-03 00:00 |
17:37:56.04 |
-37:14:44.4 |
HIP 86418 |
19.79 |
| 2026-06-03 12:00 |
17:37:31.43 |
-37:15:21.6 |
HIP 86098 |
24.19 |
| 2026-06-04 00:00 |
17:37:06.68 |
-37:15:57.4 |
HIP 86098 |
19.62 |
| 2026-06-04 12:00 |
17:36:41.78 |
-37:16:31.8 |
HIP 86098 |
15.27 |
| 2026-06-05 00:00 |
17:36:16.75 |
-37:17:04.8 |
HIP 86098 |
11.46 |
| 2026-06-05 12:00 |
17:35:51.59 |
-37:17:36.3 |
HIP 86098 |
8.94 |
| 2026-06-06 00:00 |
17:35:26.29 |
-37:18:06.4 |
HIP 86098 |
8.93 |
| 2026-06-06 12:00 |
17:35:00.88 |
-37:18:35.0 |
HIP 86098 |
11.45 |
| 2026-06-07 00:00 |
17:34:35.34 |
-37:19:02.2 |
HIP 86098 |
15.33 |
| 2026-06-07 12:00 |
17:34:09.70 |
-37:19:27.9 |
HIP 85927 |
14.80 |
| 2026-06-08 00:00 |
17:33:43.94 |
-37:19:52.1 |
HIP 85927 |
13.72 |
| 2026-06-08 12:00 |
17:33:18.09 |
-37:20:14.8 |
HIP 85927 |
14.50 |
| 2026-06-09 00:00 |
17:32:52.13 |
-37:20:36.1 |
HIP 85927 |
16.88 |
| 2026-06-09 12:00 |
17:32:26.09 |
-37:20:55.8 |
HIP 85696 |
20.18 |
| 2026-06-10 00:00 |
17:31:59.95 |
-37:21:14.0 |
HIP 85700 |
15.14 |
| 2026-06-10 12:00 |
17:31:33.74 |
-37:21:30.7 |
HIP 85700 |
10.24 |
| 2026-06-11 00:00 |
17:31:07.45 |
-37:21:45.8 |
HIP 85696 |
5.88 |
| 2026-06-11 12:00 |
17:30:41.09 |
-37:21:59.4 |
HIP 85696 |
4.35 |
| 2026-06-12 00:00 |
17:30:14.66 |
-37:22:11.5 |
HIP 85696 |
7.63 |
| 2026-06-12 12:00 |
17:29:48.17 |
-37:22:22.0 |
HIP 85696 |
12.36 |
| 2026-06-13 00:00 |
17:29:21.64 |
-37:22:31.0 |
HIP 85696 |
17.40 |
| 2026-06-13 12:00 |
17:28:55.05 |
-37:22:38.5 |
HIP 85445 |
18.63 |
| 2026-06-14 00:00 |
17:28:28.42 |
-37:22:44.3 |
HIP 85445 |
14.90 |
| 2026-06-14 12:00 |
17:28:01.76 |
-37:22:48.6 |
HIP 85445 |
12.36 |
| 2026-06-15 00:00 |
17:27:35.06 |
-37:22:51.4 |
HIP 85445 |
11.79 |
| 2026-06-15 12:00 |
17:27:08.35 |
-37:22:52.6 |
HIP 85445 |
13.46 |
| 2026-06-16 00:00 |
17:26:41.61 |
-37:22:52.2 |
HIP 85319 |
15.40 |
| 2026-06-16 12:00 |
17:26:14.87 |
-37:22:50.3 |
HIP 85319 |
13.85 |
| 2026-06-17 00:00 |
17:25:48.12 |
-37:22:46.8 |
HIP 85319 |
14.27 |
| 2026-06-17 12:00 |
17:25:21.36 |
-37:22:41.8 |
HIP 85319 |
16.50 |
| 2026-06-18 00:00 |
17:24:54.62 |
-37:22:35.2 |
HIP 85319 |
19.95 |
| 2026-06-18 12:00 |
17:24:27.89 |
-37:22:27.1 |
HIP 85048 |
20.69 |
| 2026-06-19 00:00 |
17:24:01.18 |
-37:22:17.4 |
HIP 85048 |
16.01 |
| 2026-06-19 12:00 |
17:23:34.49 |
-37:22:06.1 |
HIP 85048 |
11.88 |
| 2026-06-20 00:00 |
17:23:07.83 |
-37:21:53.4 |
HIP 85048 |
9.03 |
| 2026-06-20 12:00 |
17:22:41.20 |
-37:21:39.1 |
HIP 85048 |
8.83 |
| 2026-06-21 00:00 |
17:22:14.62 |
-37:21:23.2 |
HIP 85048 |
11.40 |
| 2026-06-21 12:00 |
17:21:48.09 |
-37:21:05.9 |
HIP 85048 |
15.41 |
| 2026-06-22 00:00 |
17:21:21.61 |
-37:20:47.0 |
HIP 85048 |
20.00 |