C/2023 X2 (Lemmon)
メタデータ
| 項目 |
値 |
| Designation |
C/2023 X2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-12-27T15:06:14.984640Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T15:42:42Z |
| Obs used |
492 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
10.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2023-12-04T08:26:50.467200Z |
| Discovery magnitude (MPC) |
19.74 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) |
2024-12-27.0000000 |
| e |
1.00082786 |
| q (au) |
5.090390 |
| a (au) |
-6148.870478 |
| i (deg) |
76.992445 |
| Ω (om, deg) |
66.309468 |
| ω (w, deg) |
64.698483 |
| M (ma, deg) |
-0.000747 |
等級
散乱 + 全体線形
$$
M_a = (4.066 + 5.636\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.066 |
| n |
5.636 |
| gf |
0.885 |
| gb |
-0.942 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
20:24:04.62 |
+81:26:17.3 |
HIP 100843 |
6.10 |
| 2026-02-03 12:00 |
20:25:12.19 |
+81:25:20.9 |
HIP 100843 |
3.65 |
| 2026-02-04 00:00 |
20:26:19.20 |
+81:24:27.0 |
HIP 100843 |
1.93 |
| 2026-02-04 12:00 |
20:27:25.66 |
+81:23:35.5 |
HIP 100965 |
2.54 |
| 2026-02-05 00:00 |
20:28:31.57 |
+81:22:46.4 |
HIP 100965 |
2.66 |
| 2026-02-05 12:00 |
20:29:36.95 |
+81:21:59.9 |
HIP 100965 |
4.56 |
| 2026-02-06 00:00 |
20:30:41.80 |
+81:21:15.7 |
HIP 100965 |
6.87 |
| 2026-02-06 12:00 |
20:31:46.14 |
+81:20:34.1 |
HIP 100965 |
9.26 |
| 2026-02-07 00:00 |
20:32:49.96 |
+81:19:54.9 |
HIP 100965 |
11.67 |
| 2026-02-07 12:00 |
20:33:53.27 |
+81:19:18.2 |
HIP 101166 |
13.61 |
| 2026-02-08 00:00 |
20:34:56.09 |
+81:18:44.0 |
HIP 101166 |
14.75 |
| 2026-02-08 12:00 |
20:35:58.42 |
+81:18:12.3 |
HIP 101166 |
16.20 |
| 2026-02-09 00:00 |
20:37:00.25 |
+81:17:43.1 |
HIP 101166 |
17.87 |
| 2026-02-09 12:00 |
20:38:01.61 |
+81:17:16.4 |
HIP 101166 |
19.71 |
| 2026-02-10 00:00 |
20:39:02.50 |
+81:16:52.2 |
HIP 101166 |
21.65 |
| 2026-02-10 12:00 |
20:40:02.91 |
+81:16:30.4 |
HIP 101166 |
23.67 |
| 2026-02-11 00:00 |
20:41:02.86 |
+81:16:11.2 |
HIP 101166 |
25.74 |
| 2026-02-11 12:00 |
20:42:02.35 |
+81:15:54.5 |
HIP 101166 |
27.84 |
| 2026-02-12 00:00 |
20:43:01.39 |
+81:15:40.4 |
HIP 101166 |
29.96 |
| 2026-02-12 12:00 |
20:43:59.97 |
+81:15:28.7 |
HIP 101166 |
32.10 |
| 2026-02-13 00:00 |
20:44:58.11 |
+81:15:19.5 |
HIP 101166 |
34.25 |
| 2026-02-13 12:00 |
20:45:55.80 |
+81:15:12.9 |
HIP 101166 |
36.39 |
| 2026-02-14 00:00 |
20:46:53.06 |
+81:15:08.8 |
HIP 103243 |
37.67 |
| 2026-02-14 12:00 |
20:47:49.88 |
+81:15:07.2 |
HIP 103938 |
36.56 |
| 2026-02-15 00:00 |
20:48:46.27 |
+81:15:08.1 |
HIP 103938 |
34.44 |
| 2026-02-15 12:00 |
20:49:42.23 |
+81:15:11.5 |
HIP 103938 |
32.34 |
| 2026-02-16 00:00 |
20:50:37.76 |
+81:15:17.5 |
HIP 103938 |
30.26 |
| 2026-02-16 12:00 |
20:51:32.87 |
+81:15:26.0 |
HIP 103938 |
28.22 |
| 2026-02-17 00:00 |
20:52:27.56 |
+81:15:37.0 |
HIP 103938 |
26.22 |
| 2026-02-17 12:00 |
20:53:21.83 |
+81:15:50.5 |
HIP 103938 |
24.26 |
| 2026-02-18 00:00 |
20:54:15.68 |
+81:16:06.5 |
HIP 103938 |
22.35 |
| 2026-02-18 12:00 |
20:55:09.12 |
+81:16:25.1 |
HIP 103938 |
20.50 |
| 2026-02-19 00:00 |
20:56:02.14 |
+81:16:46.1 |
HIP 103938 |
18.72 |
| 2026-02-19 12:00 |
20:56:54.75 |
+81:17:09.7 |
HIP 103938 |
17.05 |
| 2026-02-20 00:00 |
20:57:46.95 |
+81:17:35.7 |
HIP 103938 |
15.50 |
| 2026-02-20 12:00 |
20:58:38.74 |
+81:18:04.3 |
HIP 103938 |
14.12 |
| 2026-02-21 00:00 |
20:59:30.13 |
+81:18:35.4 |
HIP 103938 |
12.95 |
| 2026-02-21 12:00 |
21:00:21.11 |
+81:19:08.9 |
HIP 103938 |
12.05 |
| 2026-02-22 00:00 |
21:01:11.68 |
+81:19:45.0 |
HIP 103938 |
11.50 |
| 2026-02-22 12:00 |
21:02:01.85 |
+81:20:23.5 |
HIP 103938 |
11.32 |
| 2026-02-23 00:00 |
21:02:51.61 |
+81:21:04.5 |
HIP 103938 |
11.55 |
| 2026-02-23 12:00 |
21:03:40.97 |
+81:21:48.0 |
HIP 103938 |
12.15 |
| 2026-02-24 00:00 |
21:04:29.93 |
+81:22:34.0 |
HIP 103938 |
13.08 |