メタデータ
| 項目 |
値 |
| Designation |
C/2024 D1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-12-03T06:05:49.574400Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T11:42:49Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-02-16T07:22:35.817600Z |
| Discovery magnitude (MPC) |
21.96 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) |
2024-09-21.0000000 |
| e |
0.99896066 |
| q (au) |
6.696435 |
| a (au) |
6442.985621 |
| i (deg) |
132.456585 |
| Ω (om, deg) |
179.677442 |
| ω (w, deg) |
125.750357 |
| M (ma, deg) |
359.997774 |
等級
散乱 + 全体線形
$$
M_a = (8.875 + 2.854\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.875 |
| n |
2.854 |
| gf |
0.879 |
| gb |
-0.591 |
| k |
1.000 |
| δ90 |
1.001 |
| 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 |
06:15:56.61 |
+70:26:18.9 |
HIP 29669 |
14.53 |
| 2026-03-26 12:00 |
06:15:35.10 |
+70:23:39.3 |
HIP 29669 |
16.66 |
| 2026-03-27 00:00 |
06:15:14.10 |
+70:20:59.8 |
HIP 29669 |
19.10 |
| 2026-03-27 12:00 |
06:14:53.60 |
+70:18:20.4 |
HIP 29303 |
21.71 |
| 2026-03-28 00:00 |
06:14:33.60 |
+70:15:41.2 |
HIP 29303 |
19.78 |
| 2026-03-28 12:00 |
06:14:14.09 |
+70:13:02.0 |
HIP 29303 |
18.23 |
| 2026-03-29 00:00 |
06:13:55.07 |
+70:10:22.9 |
HIP 29303 |
17.15 |
| 2026-03-29 12:00 |
06:13:36.53 |
+70:07:44.1 |
HIP 29303 |
16.62 |
| 2026-03-30 00:00 |
06:13:18.48 |
+70:05:05.4 |
HIP 29402 |
16.49 |
| 2026-03-30 12:00 |
06:13:00.90 |
+70:02:26.9 |
HIP 29402 |
13.45 |
| 2026-03-31 00:00 |
06:12:43.79 |
+69:59:48.6 |
HIP 29402 |
10.44 |
| 2026-03-31 12:00 |
06:12:27.14 |
+69:57:10.6 |
HIP 29402 |
7.44 |
| 2026-04-01 00:00 |
06:12:10.96 |
+69:54:32.8 |
HIP 29402 |
4.47 |
| 2026-04-01 12:00 |
06:11:55.24 |
+69:51:55.3 |
HIP 29402 |
1.52 |
| 2026-04-02 00:00 |
06:11:39.96 |
+69:49:18.1 |
HIP 29402 |
1.43 |
| 2026-04-02 12:00 |
06:11:25.14 |
+69:46:41.2 |
HIP 29402 |
4.33 |
| 2026-04-03 00:00 |
06:11:10.76 |
+69:44:04.6 |
HIP 29402 |
7.23 |
| 2026-04-03 12:00 |
06:10:56.82 |
+69:41:28.4 |
HIP 29402 |
10.10 |
| 2026-04-04 00:00 |
06:10:43.31 |
+69:38:52.5 |
HIP 29402 |
12.95 |
| 2026-04-04 12:00 |
06:10:30.24 |
+69:36:17.0 |
HIP 29402 |
15.78 |
| 2026-04-05 00:00 |
06:10:17.59 |
+69:33:41.8 |
HIP 29402 |
18.59 |
| 2026-04-05 12:00 |
06:10:05.37 |
+69:31:07.1 |
HIP 28902 |
21.12 |
| 2026-04-06 00:00 |
06:09:53.57 |
+69:28:32.8 |
HIP 28902 |
19.95 |
| 2026-04-06 12:00 |
06:09:42.18 |
+69:25:58.9 |
HIP 28902 |
19.15 |
| 2026-04-07 00:00 |
06:09:31.20 |
+69:23:25.5 |
HIP 28902 |
18.75 |
| 2026-04-07 12:00 |
06:09:20.63 |
+69:20:52.5 |
HIP 28902 |
18.77 |
| 2026-04-08 00:00 |
06:09:10.46 |
+69:18:20.0 |
HIP 28902 |
19.20 |
| 2026-04-08 12:00 |
06:09:00.70 |
+69:15:48.0 |
HIP 28902 |
20.00 |
| 2026-04-09 00:00 |
06:08:51.32 |
+69:13:16.5 |
HIP 28902 |
21.14 |
| 2026-04-09 12:00 |
06:08:42.34 |
+69:10:45.5 |
HIP 28902 |
22.54 |
| 2026-04-10 00:00 |
06:08:33.74 |
+69:08:15.1 |
HIP 28996 |
21.60 |
| 2026-04-10 12:00 |
06:08:25.53 |
+69:05:45.2 |
HIP 28996 |
19.01 |
| 2026-04-11 00:00 |
06:08:17.70 |
+69:03:15.8 |
HIP 28996 |
16.45 |
| 2026-04-11 12:00 |
06:08:10.24 |
+69:00:47.0 |
HIP 28996 |
13.91 |
| 2026-04-12 00:00 |
06:08:03.15 |
+68:58:18.8 |
HIP 28996 |
11.41 |
| 2026-04-12 12:00 |
06:07:56.43 |
+68:55:51.2 |
HIP 28996 |
8.97 |
| 2026-04-13 00:00 |
06:07:50.08 |
+68:53:24.1 |
HIP 28996 |
6.61 |
| 2026-04-13 12:00 |
06:07:44.09 |
+68:50:57.7 |
HIP 28996 |
4.47 |
| 2026-04-14 00:00 |
06:07:38.45 |
+68:48:31.9 |
HIP 28996 |
2.99 |
| 2026-04-14 12:00 |
06:07:33.16 |
+68:46:06.8 |
HIP 28996 |
3.22 |
| 2026-04-15 00:00 |
06:07:28.23 |
+68:43:42.3 |
HIP 28996 |
4.89 |
| 2026-04-15 12:00 |
06:07:23.64 |
+68:41:18.5 |
HIP 29130 |
6.83 |
| 2026-04-16 00:00 |
06:07:19.39 |
+68:38:55.3 |
HIP 29130 |
8.03 |