メタデータ
| 項目 |
値 |
| Designation |
C/2024 B2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-10-06T00:00:41.523840Z |
| Orbit solution date (soln_date, UTC) |
2025-01-02T20:12:33Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-01-31T06:07:50.448000Z |
| Discovery magnitude (MPC) |
20.60 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) |
2024-02-17.0000000 |
| e |
0.99929047 |
| q (au) |
4.076491 |
| a (au) |
5745.321334 |
| i (deg) |
99.839185 |
| Ω (om, deg) |
294.378058 |
| ω (w, deg) |
130.312850 |
| M (ma, deg) |
0.000303 |
等級
散乱 + 全体線形
$$
M_a = (18.987 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.987 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.840 |
| k |
0.800 |
| 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) |
| 2026-07-29 00:00 |
06:55:31.40 |
-17:43:48.6 |
HIP 33234 |
10.48 |
| 2026-07-29 12:00 |
06:55:41.48 |
-17:45:47.6 |
HIP 33234 |
11.82 |
| 2026-07-30 00:00 |
06:55:51.52 |
-17:47:47.5 |
HIP 33234 |
13.73 |
| 2026-07-30 12:00 |
06:56:01.52 |
-17:49:48.2 |
HIP 33234 |
16.02 |
| 2026-07-31 00:00 |
06:56:11.47 |
-17:51:49.8 |
HIP 33234 |
18.53 |
| 2026-07-31 12:00 |
06:56:21.39 |
-17:53:52.1 |
HIP 33234 |
21.21 |
| 2026-08-01 00:00 |
06:56:31.27 |
-17:55:55.3 |
HIP 33234 |
23.98 |
| 2026-08-01 12:00 |
06:56:41.10 |
-17:57:59.2 |
HIP 33541 |
24.79 |
| 2026-08-02 00:00 |
06:56:50.89 |
-18:00:04.0 |
HIP 33541 |
23.83 |
| 2026-08-02 12:00 |
06:57:00.63 |
-18:02:09.6 |
HIP 33541 |
23.27 |
| 2026-08-03 00:00 |
06:57:10.33 |
-18:04:16.0 |
HIP 33571 |
20.64 |
| 2026-08-03 12:00 |
06:57:19.98 |
-18:06:23.2 |
HIP 33571 |
17.77 |
| 2026-08-04 00:00 |
06:57:29.59 |
-18:08:31.2 |
HIP 33571 |
15.03 |
| 2026-08-04 12:00 |
06:57:39.16 |
-18:10:40.0 |
HIP 33571 |
12.47 |
| 2026-08-05 00:00 |
06:57:48.67 |
-18:12:49.6 |
HIP 33571 |
10.24 |
| 2026-08-05 12:00 |
06:57:58.14 |
-18:15:00.0 |
HIP 33571 |
8.62 |
| 2026-08-06 00:00 |
06:58:07.56 |
-18:17:11.2 |
HIP 33571 |
7.97 |
| 2026-08-06 12:00 |
06:58:16.93 |
-18:19:23.2 |
HIP 33571 |
8.51 |
| 2026-08-07 00:00 |
06:58:26.25 |
-18:21:36.0 |
HIP 33571 |
10.07 |
| 2026-08-07 12:00 |
06:58:35.52 |
-18:23:49.6 |
HIP 33571 |
12.26 |
| 2026-08-08 00:00 |
06:58:44.74 |
-18:26:04.0 |
HIP 33571 |
14.80 |
| 2026-08-08 12:00 |
06:58:53.90 |
-18:28:19.2 |
HIP 33571 |
17.54 |
| 2026-08-09 00:00 |
06:59:03.02 |
-18:30:35.1 |
HIP 33571 |
20.40 |
| 2026-08-09 12:00 |
06:59:12.08 |
-18:32:51.8 |
HIP 33571 |
23.33 |
| 2026-08-10 00:00 |
06:59:21.09 |
-18:35:09.3 |
HIP 33571 |
26.32 |
| 2026-08-10 12:00 |
06:59:30.04 |
-18:37:27.6 |
HIP 33571 |
29.35 |
| 2026-08-11 00:00 |
06:59:38.93 |
-18:39:46.7 |
HIP 33571 |
32.39 |
| 2026-08-11 12:00 |
06:59:47.77 |
-18:42:06.5 |
HIP 33571 |
35.46 |
| 2026-08-12 00:00 |
06:59:56.56 |
-18:44:27.1 |
HIP 33838 |
35.23 |
| 2026-08-12 12:00 |
07:00:05.28 |
-18:46:48.4 |
HIP 33838 |
32.10 |
| 2026-08-13 00:00 |
07:00:13.95 |
-18:49:10.5 |
HIP 33838 |
28.97 |
| 2026-08-13 12:00 |
07:00:22.56 |
-18:51:33.4 |
HIP 33838 |
25.84 |
| 2026-08-14 00:00 |
07:00:31.11 |
-18:53:57.0 |
HIP 33838 |
22.71 |
| 2026-08-14 12:00 |
07:00:39.60 |
-18:56:21.4 |
HIP 33838 |
19.58 |
| 2026-08-15 00:00 |
07:00:48.02 |
-18:58:46.5 |
HIP 33838 |
16.45 |
| 2026-08-15 12:00 |
07:00:56.39 |
-19:01:12.3 |
HIP 33838 |
13.32 |
| 2026-08-16 00:00 |
07:01:04.69 |
-19:03:38.9 |
HIP 33838 |
10.19 |
| 2026-08-16 12:00 |
07:01:12.93 |
-19:06:06.1 |
HIP 33838 |
7.07 |
| 2026-08-17 00:00 |
07:01:21.11 |
-19:08:34.2 |
HIP 33838 |
3.96 |
| 2026-08-17 12:00 |
07:01:29.22 |
-19:11:02.9 |
HIP 33838 |
0.97 |
| 2026-08-18 00:00 |
07:01:37.26 |
-19:13:32.4 |
HIP 33838 |
2.42 |
| 2026-08-18 12:00 |
07:01:45.25 |
-19:16:02.5 |
HIP 33838 |
5.51 |
| 2026-08-19 00:00 |
07:01:53.16 |
-19:18:33.4 |
HIP 33838 |
8.63 |