メタデータ
| 項目 |
値 |
| Designation |
C/2022 Y2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-03-22T15:21:30.427200Z |
| Orbit solution date (soln_date, UTC) |
2023-10-13T18:13:03Z |
| Obs used |
164 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
20.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-12-24T11:14:57.408000Z |
| Discovery magnitude (MPC) |
20.08 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) |
2023-02-01.0000000 |
| e |
0.87043280 |
| q (au) |
2.544961 |
| a (au) |
19.642019 |
| i (deg) |
165.907028 |
| Ω (om, deg) |
216.349394 |
| ω (w, deg) |
105.553752 |
| M (ma, deg) |
359.437974 |
等級
散乱 + 全体線形
$$
M_a = (11.679 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.679 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.811 |
| k |
0.996 |
| 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 |
23:40:45.24 |
-12:23:48.3 |
HIP 116878 |
28.30 |
| 2026-03-26 12:00 |
23:40:53.75 |
-12:23:10.3 |
HIP 116878 |
27.00 |
| 2026-03-27 00:00 |
23:41:02.25 |
-12:22:32.7 |
HIP 116878 |
25.82 |
| 2026-03-27 12:00 |
23:41:10.72 |
-12:21:55.4 |
HIP 116878 |
24.78 |
| 2026-03-28 00:00 |
23:41:19.18 |
-12:21:18.5 |
HIP 116878 |
23.90 |
| 2026-03-28 12:00 |
23:41:27.61 |
-12:20:42.1 |
HIP 116878 |
23.19 |
| 2026-03-29 00:00 |
23:41:36.02 |
-12:20:06.0 |
HIP 116878 |
22.67 |
| 2026-03-29 12:00 |
23:41:44.40 |
-12:19:30.2 |
HIP 117002 |
21.87 |
| 2026-03-30 00:00 |
23:41:52.76 |
-12:18:54.9 |
HIP 117002 |
19.74 |
| 2026-03-30 12:00 |
23:42:01.10 |
-12:18:20.0 |
HIP 117002 |
17.62 |
| 2026-03-31 00:00 |
23:42:09.41 |
-12:17:45.5 |
HIP 117002 |
15.52 |
| 2026-03-31 12:00 |
23:42:17.70 |
-12:17:11.4 |
HIP 117002 |
13.41 |
| 2026-04-01 00:00 |
23:42:25.96 |
-12:16:37.7 |
HIP 117002 |
11.32 |
| 2026-04-01 12:00 |
23:42:34.19 |
-12:16:04.4 |
HIP 117002 |
9.24 |
| 2026-04-02 00:00 |
23:42:42.40 |
-12:15:31.5 |
HIP 117002 |
7.16 |
| 2026-04-02 12:00 |
23:42:50.58 |
-12:14:59.1 |
HIP 117002 |
5.10 |
| 2026-04-03 00:00 |
23:42:58.73 |
-12:14:27.0 |
HIP 117002 |
3.06 |
| 2026-04-03 12:00 |
23:43:06.85 |
-12:13:55.4 |
HIP 117002 |
1.12 |
| 2026-04-04 00:00 |
23:43:14.94 |
-12:13:24.2 |
HIP 117002 |
1.24 |
| 2026-04-04 12:00 |
23:43:23.00 |
-12:12:53.5 |
HIP 117002 |
3.18 |
| 2026-04-05 00:00 |
23:43:31.03 |
-12:12:23.1 |
HIP 117002 |
5.19 |
| 2026-04-05 12:00 |
23:43:39.03 |
-12:11:53.3 |
HIP 117002 |
7.20 |
| 2026-04-06 00:00 |
23:43:47.00 |
-12:11:23.8 |
HIP 117002 |
9.20 |
| 2026-04-06 12:00 |
23:43:54.94 |
-12:10:54.8 |
HIP 117002 |
11.20 |
| 2026-04-07 00:00 |
23:44:02.84 |
-12:10:26.3 |
HIP 117002 |
13.18 |
| 2026-04-07 12:00 |
23:44:10.71 |
-12:09:58.2 |
HIP 117002 |
15.16 |
| 2026-04-08 00:00 |
23:44:18.55 |
-12:09:30.5 |
HIP 117002 |
17.13 |
| 2026-04-08 12:00 |
23:44:26.35 |
-12:09:03.4 |
HIP 117002 |
19.09 |
| 2026-04-09 00:00 |
23:44:34.11 |
-12:08:36.6 |
HIP 117002 |
21.04 |
| 2026-04-09 12:00 |
23:44:41.84 |
-12:08:10.4 |
HIP 117002 |
22.98 |
| 2026-04-10 00:00 |
23:44:49.54 |
-12:07:44.6 |
HIP 117002 |
24.91 |
| 2026-04-10 12:00 |
23:44:57.19 |
-12:07:19.3 |
HIP 117002 |
26.83 |
| 2026-04-11 00:00 |
23:45:04.81 |
-12:06:54.5 |
HIP 117002 |
28.73 |
| 2026-04-11 12:00 |
23:45:12.39 |
-12:06:30.1 |
HIP 117002 |
30.63 |
| 2026-04-12 00:00 |
23:45:19.94 |
-12:06:06.3 |
HIP 117314 |
30.59 |
| 2026-04-12 12:00 |
23:45:27.44 |
-12:05:42.9 |
HIP 117314 |
28.75 |
| 2026-04-13 00:00 |
23:45:34.90 |
-12:05:20.0 |
HIP 117314 |
26.92 |
| 2026-04-13 12:00 |
23:45:42.32 |
-12:04:57.7 |
HIP 117314 |
25.11 |
| 2026-04-14 00:00 |
23:45:49.70 |
-12:04:35.8 |
HIP 117314 |
23.32 |
| 2026-04-14 12:00 |
23:45:57.04 |
-12:04:14.4 |
HIP 117314 |
21.55 |
| 2026-04-15 00:00 |
23:46:04.34 |
-12:03:53.5 |
HIP 117314 |
19.80 |
| 2026-04-15 12:00 |
23:46:11.59 |
-12:03:33.2 |
HIP 117314 |
18.08 |
| 2026-04-16 00:00 |
23:46:18.80 |
-12:03:13.3 |
HIP 117314 |
16.39 |