メタデータ
| 項目 |
値 |
| Designation |
349P/Lemmon |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-08-26T09:11:30.854400Z |
| Orbit solution date (soln_date, UTC) |
2026-09-04T08:42:17Z |
| Obs used |
228 |
| NEO |
- |
| M1 |
8.800 |
| K1 |
22.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-03-15.0000000 |
| e |
0.29966039 |
| q (au) |
2.501119 |
| a (au) |
3.571295 |
| i (deg) |
5.491574 |
| Ω (om, deg) |
331.755170 |
| ω (w, deg) |
256.030164 |
| M (ma, deg) |
136.051381 |
等級
散乱 + 全体線形
$$
M_a = (15.374 + 3.702\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.374 |
| n |
3.702 |
| gf |
0.994 |
| gb |
-0.646 |
| k |
0.914 |
| δ90 |
9.992 |
| 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) |
| 2026-09-20 00:00 |
01:01:35.32 |
+11:39:33.0 |
HIP 4775 |
15.57 |
| 2026-09-20 12:00 |
01:01:17.32 |
+11:38:13.3 |
HIP 4775 |
16.58 |
| 2026-09-21 00:00 |
01:00:59.21 |
+11:36:52.6 |
HIP 4775 |
18.72 |
| 2026-09-21 12:00 |
01:00:40.99 |
+11:35:30.8 |
HIP 4775 |
21.68 |
| 2026-09-22 00:00 |
01:00:22.67 |
+11:34:08.0 |
HIP 4687 |
22.11 |
| 2026-09-22 12:00 |
01:00:04.25 |
+11:32:44.1 |
HIP 4687 |
23.49 |
| 2026-09-23 00:00 |
00:59:45.74 |
+11:31:19.2 |
HIP 4687 |
25.69 |
| 2026-09-23 12:00 |
00:59:27.13 |
+11:29:53.3 |
HIP 4687 |
28.55 |
| 2026-09-24 00:00 |
00:59:08.44 |
+11:28:26.4 |
HIP 4461 |
28.61 |
| 2026-09-24 12:00 |
00:58:49.66 |
+11:26:58.6 |
HIP 4461 |
24.00 |
| 2026-09-25 00:00 |
00:58:30.80 |
+11:25:29.7 |
HIP 4461 |
19.46 |
| 2026-09-25 12:00 |
00:58:11.86 |
+11:24:00.0 |
HIP 4461 |
15.11 |
| 2026-09-26 00:00 |
00:57:52.85 |
+11:22:29.3 |
HIP 4461 |
11.19 |
| 2026-09-26 12:00 |
00:57:33.76 |
+11:20:57.7 |
HIP 4461 |
8.37 |
| 2026-09-27 00:00 |
00:57:14.61 |
+11:19:25.2 |
HIP 4461 |
7.98 |
| 2026-09-27 12:00 |
00:56:55.39 |
+11:17:51.8 |
HIP 4461 |
10.31 |
| 2026-09-28 00:00 |
00:56:36.11 |
+11:16:17.6 |
HIP 4461 |
14.10 |
| 2026-09-28 12:00 |
00:56:16.77 |
+11:14:42.5 |
HIP 4461 |
18.49 |
| 2026-09-29 00:00 |
00:55:57.37 |
+11:13:06.6 |
HIP 4461 |
23.14 |
| 2026-09-29 12:00 |
00:55:37.92 |
+11:11:29.9 |
HIP 4221 |
26.71 |
| 2026-09-30 00:00 |
00:55:18.43 |
+11:09:52.4 |
HIP 4221 |
21.76 |
| 2026-09-30 12:00 |
00:54:58.89 |
+11:08:14.1 |
HIP 4221 |
16.84 |
| 2026-10-01 00:00 |
00:54:39.31 |
+11:06:35.0 |
HIP 4221 |
12.04 |
| 2026-10-01 12:00 |
00:54:19.69 |
+11:04:55.3 |
HIP 4221 |
7.60 |
| 2026-10-02 00:00 |
00:54:00.04 |
+11:03:14.8 |
HIP 4221 |
4.75 |
| 2026-10-02 12:00 |
00:53:40.36 |
+11:01:33.6 |
HIP 4221 |
6.29 |
| 2026-10-03 00:00 |
00:53:20.65 |
+10:59:51.7 |
HIP 4221 |
10.45 |
| 2026-10-03 12:00 |
00:53:00.92 |
+10:58:09.2 |
HIP 4221 |
15.22 |
| 2026-10-04 00:00 |
00:52:41.16 |
+10:56:26.1 |
HIP 4221 |
20.18 |
| 2026-10-04 12:00 |
00:52:21.40 |
+10:54:42.3 |
HIP 4065 |
18.95 |
| 2026-10-05 00:00 |
00:52:01.62 |
+10:52:57.9 |
HIP 4065 |
16.97 |
| 2026-10-05 12:00 |
00:51:41.83 |
+10:51:13.0 |
HIP 4065 |
16.43 |
| 2026-10-06 00:00 |
00:51:22.04 |
+10:49:27.5 |
HIP 4065 |
17.46 |
| 2026-10-06 12:00 |
00:51:02.25 |
+10:47:41.5 |
HIP 4065 |
19.82 |
| 2026-10-07 00:00 |
00:50:42.46 |
+10:45:55.0 |
HIP 3938 |
21.34 |
| 2026-10-07 12:00 |
00:50:22.68 |
+10:44:08.0 |
HIP 3938 |
19.61 |
| 2026-10-08 00:00 |
00:50:02.91 |
+10:42:20.5 |
HIP 3938 |
19.17 |
| 2026-10-08 12:00 |
00:49:43.15 |
+10:40:32.7 |
HIP 3938 |
20.09 |
| 2026-10-09 00:00 |
00:49:23.42 |
+10:38:44.4 |
HIP 3938 |
22.20 |
| 2026-10-09 12:00 |
00:49:03.70 |
+10:36:55.7 |
HIP 3761 |
24.28 |
| 2026-10-10 00:00 |
00:48:44.02 |
+10:35:06.6 |
HIP 3761 |
20.69 |
| 2026-10-10 12:00 |
00:48:24.36 |
+10:33:17.3 |
HIP 3761 |
17.89 |
| 2026-10-11 00:00 |
00:48:04.74 |
+10:31:27.6 |
HIP 3761 |
16.28 |