メタデータ
| 項目 |
値 |
| Designation |
C/2025 A1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-03-12T11:47:50.602560Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:19Z |
| Obs used |
384 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
11.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-01-02T06:39:55.180800Z |
| Discovery magnitude (MPC) |
20.50 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-06-28.0000000 |
| e |
1.00247148 |
| q (au) |
5.346637 |
| a (au) |
-2163.337117 |
| i (deg) |
33.423380 |
| Ω (om, deg) |
101.330665 |
| ω (w, deg) |
68.019648 |
| M (ma, deg) |
-0.006097 |
等級
散乱 + 全体線形
$$
M_a = (4.644 + 4.859\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.644 |
| n |
4.859 |
| gf |
1.000 |
| gb |
-0.967 |
| 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) |
| 2026-03-26 00:00 |
08:22:15.92 |
+37:53:49.7 |
HIP 40883 |
33.55 |
| 2026-03-26 12:00 |
08:22:16.45 |
+37:53:53.6 |
HIP 40883 |
33.56 |
| 2026-03-27 00:00 |
08:22:17.17 |
+37:53:56.6 |
HIP 40883 |
33.61 |
| 2026-03-27 12:00 |
08:22:18.10 |
+37:53:58.6 |
HIP 40883 |
33.69 |
| 2026-03-28 00:00 |
08:22:19.23 |
+37:53:59.7 |
HIP 40883 |
33.81 |
| 2026-03-28 12:00 |
08:22:20.56 |
+37:53:59.9 |
HIP 40883 |
33.97 |
| 2026-03-29 00:00 |
08:22:22.09 |
+37:53:59.1 |
HIP 40883 |
34.16 |
| 2026-03-29 12:00 |
08:22:23.83 |
+37:53:57.4 |
HIP 40883 |
34.40 |
| 2026-03-30 00:00 |
08:22:25.76 |
+37:53:54.9 |
HIP 40883 |
34.67 |
| 2026-03-30 12:00 |
08:22:27.90 |
+37:53:51.4 |
HIP 40883 |
34.99 |
| 2026-03-31 00:00 |
08:22:30.24 |
+37:53:47.0 |
HIP 40883 |
35.34 |
| 2026-03-31 12:00 |
08:22:32.78 |
+37:53:41.7 |
HIP 40883 |
35.73 |
| 2026-04-01 00:00 |
08:22:35.52 |
+37:53:35.6 |
HIP 40883 |
36.16 |
| 2026-04-01 12:00 |
08:22:38.46 |
+37:53:28.5 |
HIP 40883 |
36.63 |
| 2026-04-02 00:00 |
08:22:41.61 |
+37:53:20.7 |
HIP 40883 |
37.15 |
| 2026-04-02 12:00 |
08:22:44.95 |
+37:53:11.9 |
HIP 41165 |
37.24 |
| 2026-04-03 00:00 |
08:22:48.50 |
+37:53:02.3 |
HIP 41165 |
37.13 |
| 2026-04-03 12:00 |
08:22:52.24 |
+37:52:51.8 |
HIP 41165 |
37.04 |
| 2026-04-04 00:00 |
08:22:56.19 |
+37:52:40.5 |
HIP 41165 |
36.97 |
| 2026-04-04 12:00 |
08:23:00.34 |
+37:52:28.4 |
HIP 41165 |
36.91 |
| 2026-04-05 00:00 |
08:23:04.69 |
+37:52:15.5 |
HIP 41165 |
36.88 |
| 2026-04-05 12:00 |
08:23:09.24 |
+37:52:01.7 |
HIP 41165 |
36.87 |
| 2026-04-06 00:00 |
08:23:13.99 |
+37:51:47.1 |
HIP 41165 |
36.88 |
| 2026-04-06 12:00 |
08:23:18.94 |
+37:51:31.7 |
HIP 41165 |
36.93 |
| 2026-04-07 00:00 |
08:23:24.09 |
+37:51:15.5 |
HIP 41286 |
36.64 |
| 2026-04-07 12:00 |
08:23:29.44 |
+37:50:58.5 |
HIP 41286 |
35.74 |
| 2026-04-08 00:00 |
08:23:34.99 |
+37:50:40.7 |
HIP 41286 |
34.82 |
| 2026-04-08 12:00 |
08:23:40.74 |
+37:50:22.1 |
HIP 41286 |
33.88 |
| 2026-04-09 00:00 |
08:23:46.69 |
+37:50:02.7 |
HIP 41286 |
32.92 |
| 2026-04-09 12:00 |
08:23:52.84 |
+37:49:42.6 |
HIP 41286 |
31.95 |
| 2026-04-10 00:00 |
08:23:59.18 |
+37:49:21.7 |
HIP 41286 |
30.97 |
| 2026-04-10 12:00 |
08:24:05.73 |
+37:49:00.0 |
HIP 41286 |
29.98 |
| 2026-04-11 00:00 |
08:24:12.47 |
+37:48:37.6 |
HIP 41286 |
28.98 |
| 2026-04-11 12:00 |
08:24:19.41 |
+37:48:14.5 |
HIP 41286 |
28.00 |
| 2026-04-12 00:00 |
08:24:26.55 |
+37:47:50.6 |
HIP 41286 |
27.02 |
| 2026-04-12 12:00 |
08:24:33.88 |
+37:47:25.9 |
HIP 41367 |
25.70 |
| 2026-04-13 00:00 |
08:24:41.42 |
+37:47:00.6 |
HIP 41367 |
24.25 |
| 2026-04-13 12:00 |
08:24:49.14 |
+37:46:34.5 |
HIP 41367 |
22.76 |
| 2026-04-14 00:00 |
08:24:57.07 |
+37:46:07.6 |
HIP 41367 |
21.25 |
| 2026-04-14 12:00 |
08:25:05.19 |
+37:45:40.1 |
HIP 41367 |
19.73 |
| 2026-04-15 00:00 |
08:25:13.51 |
+37:45:11.9 |
HIP 41367 |
18.19 |
| 2026-04-15 12:00 |
08:25:22.02 |
+37:44:42.9 |
HIP 41367 |
16.65 |
| 2026-04-16 00:00 |
08:25:30.73 |
+37:44:13.3 |
HIP 41367 |
15.13 |