メタデータ
| 項目 |
値 |
| Designation |
C/2024 D1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-12-03T06:40:33.049920Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T11:12:28Z |
| Obs used |
72 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
10.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-02-16T07:22:35.817600Z |
| Discovery magnitude (MPC) |
21.96 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-10-07.0000000 |
| e |
0.99894213 |
| q (au) |
6.696186 |
| a (au) |
6329.900246 |
| i (deg) |
132.456254 |
| Ω (om, deg) |
179.676744 |
| ω (w, deg) |
125.753045 |
| M (ma, deg) |
359.997745 |
等級
散乱 + 全体線形
$$
M_a = (3.802 + 4.676\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.802 |
| n |
4.676 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.995 |
| 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) |
| 2026-07-29 00:00 |
06:49:59.24 |
+66:07:19.9 |
HIP 32817 |
9.90 |
| 2026-07-29 12:00 |
06:50:14.51 |
+66:08:28.3 |
HIP 32817 |
8.43 |
| 2026-07-30 00:00 |
06:50:29.70 |
+66:09:38.0 |
HIP 32817 |
7.15 |
| 2026-07-30 12:00 |
06:50:44.80 |
+66:10:48.8 |
HIP 32817 |
6.20 |
| 2026-07-31 00:00 |
06:50:59.82 |
+66:12:00.8 |
HIP 32817 |
5.74 |
| 2026-07-31 12:00 |
06:51:14.75 |
+66:13:14.0 |
HIP 32817 |
5.88 |
| 2026-08-01 00:00 |
06:51:29.58 |
+66:14:28.4 |
HIP 32817 |
6.59 |
| 2026-08-01 12:00 |
06:51:44.33 |
+66:15:44.0 |
HIP 32817 |
7.73 |
| 2026-08-02 00:00 |
06:51:58.99 |
+66:17:00.7 |
HIP 32817 |
9.13 |
| 2026-08-02 12:00 |
06:52:13.54 |
+66:18:18.7 |
HIP 32817 |
10.69 |
| 2026-08-03 00:00 |
06:52:28.00 |
+66:19:37.8 |
HIP 32817 |
12.37 |
| 2026-08-03 12:00 |
06:52:42.37 |
+66:20:58.1 |
HIP 32817 |
14.11 |
| 2026-08-04 00:00 |
06:52:56.63 |
+66:22:19.6 |
HIP 32817 |
15.89 |
| 2026-08-04 12:00 |
06:53:10.79 |
+66:23:42.4 |
HIP 32817 |
17.72 |
| 2026-08-05 00:00 |
06:53:24.84 |
+66:25:06.3 |
HIP 32817 |
19.57 |
| 2026-08-05 12:00 |
06:53:38.79 |
+66:26:31.4 |
HIP 32817 |
21.44 |
| 2026-08-06 00:00 |
06:53:52.62 |
+66:27:57.7 |
HIP 32817 |
23.33 |
| 2026-08-06 12:00 |
06:54:06.35 |
+66:29:25.3 |
HIP 32817 |
25.23 |
| 2026-08-07 00:00 |
06:54:19.96 |
+66:30:54.0 |
HIP 32817 |
27.15 |
| 2026-08-07 12:00 |
06:54:33.46 |
+66:32:24.0 |
HIP 32817 |
29.08 |
| 2026-08-08 00:00 |
06:54:46.84 |
+66:33:55.1 |
HIP 32817 |
31.02 |
| 2026-08-08 12:00 |
06:55:00.10 |
+66:35:27.5 |
HIP 32817 |
32.97 |
| 2026-08-09 00:00 |
06:55:13.24 |
+66:37:01.1 |
HIP 33704 |
32.88 |
| 2026-08-09 12:00 |
06:55:26.25 |
+66:38:36.0 |
HIP 33704 |
32.47 |
| 2026-08-10 00:00 |
06:55:39.13 |
+66:40:12.0 |
HIP 33704 |
32.21 |
| 2026-08-10 12:00 |
06:55:51.89 |
+66:41:49.3 |
HIP 33704 |
32.10 |
| 2026-08-11 00:00 |
06:56:04.51 |
+66:43:27.8 |
HIP 33704 |
32.15 |
| 2026-08-11 12:00 |
06:56:17.00 |
+66:45:07.6 |
HIP 33704 |
32.35 |
| 2026-08-12 00:00 |
06:56:29.35 |
+66:46:48.5 |
HIP 33074 |
32.50 |
| 2026-08-12 12:00 |
06:56:41.56 |
+66:48:30.7 |
HIP 33074 |
31.85 |
| 2026-08-13 00:00 |
06:56:53.63 |
+66:50:14.2 |
HIP 33074 |
31.30 |
| 2026-08-13 12:00 |
06:57:05.55 |
+66:51:58.8 |
HIP 33074 |
30.86 |
| 2026-08-14 00:00 |
06:57:17.33 |
+66:53:44.7 |
HIP 33074 |
30.53 |
| 2026-08-14 12:00 |
06:57:28.96 |
+66:55:31.9 |
HIP 33722 |
29.50 |
| 2026-08-15 00:00 |
06:57:40.43 |
+66:57:20.2 |
HIP 33722 |
27.37 |
| 2026-08-15 12:00 |
06:57:51.75 |
+66:59:09.8 |
HIP 33722 |
25.24 |
| 2026-08-16 00:00 |
06:58:02.91 |
+67:01:00.6 |
HIP 33722 |
23.10 |
| 2026-08-16 12:00 |
06:58:13.91 |
+67:02:52.7 |
HIP 33722 |
20.96 |
| 2026-08-17 00:00 |
06:58:24.75 |
+67:04:46.0 |
HIP 33722 |
18.81 |
| 2026-08-17 12:00 |
06:58:35.42 |
+67:06:40.5 |
HIP 33722 |
16.66 |
| 2026-08-18 00:00 |
06:58:45.93 |
+67:08:36.3 |
HIP 33722 |
14.51 |
| 2026-08-18 12:00 |
06:58:56.26 |
+67:10:33.3 |
HIP 33722 |
12.38 |
| 2026-08-19 00:00 |
06:59:06.42 |
+67:12:31.5 |
HIP 33722 |
10.26 |