メタデータ
| 項目 |
値 |
| Designation |
C/2024 X4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-09-01T21:49:17.152320Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:43:10Z |
| Obs used |
57 |
| NEO |
- |
| M1 |
16.000 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-12-08T05:19:38.726400Z |
| Discovery magnitude (MPC) |
21.38 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-05-05.0000000 |
| e |
0.64171387 |
| q (au) |
3.604575 |
| a (au) |
10.060605 |
| i (deg) |
34.669175 |
| Ω (om, deg) |
258.942704 |
| ω (w, deg) |
153.294339 |
| M (ma, deg) |
356.296430 |
等級
散乱 + 全体線形
$$
M_a = (14.713 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.713 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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
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) |
| 2026-05-12 00:00 |
05:37:18.77 |
+15:37:12.4 |
HIP 26359 |
7.11 |
| 2026-05-12 12:00 |
05:37:52.99 |
+15:35:51.3 |
HIP 26359 |
15.40 |
| 2026-05-13 00:00 |
05:38:27.24 |
+15:34:29.7 |
HIP 26475 |
22.03 |
| 2026-05-13 12:00 |
05:39:01.51 |
+15:33:07.7 |
HIP 26690 |
22.08 |
| 2026-05-14 00:00 |
05:39:35.82 |
+15:31:45.3 |
HIP 26690 |
14.81 |
| 2026-05-14 12:00 |
05:40:10.16 |
+15:30:22.5 |
HIP 26690 |
9.55 |
| 2026-05-15 00:00 |
05:40:44.52 |
+15:28:59.2 |
HIP 26692 |
10.10 |
| 2026-05-15 12:00 |
05:41:18.92 |
+15:27:35.4 |
HIP 26844 |
12.11 |
| 2026-05-16 00:00 |
05:41:53.33 |
+15:26:11.2 |
HIP 26844 |
6.09 |
| 2026-05-16 12:00 |
05:42:27.78 |
+15:24:46.6 |
HIP 26844 |
8.32 |
| 2026-05-17 00:00 |
05:43:02.25 |
+15:23:21.4 |
HIP 26844 |
15.60 |
| 2026-05-17 12:00 |
05:43:36.74 |
+15:21:55.9 |
HIP 27078 |
22.40 |
| 2026-05-18 00:00 |
05:44:11.25 |
+15:20:29.8 |
HIP 27078 |
17.37 |
| 2026-05-18 12:00 |
05:44:45.79 |
+15:19:03.3 |
HIP 27078 |
15.63 |
| 2026-05-19 00:00 |
05:45:20.35 |
+15:17:36.2 |
HIP 27078 |
18.16 |
| 2026-05-19 12:00 |
05:45:54.92 |
+15:16:08.7 |
HIP 27310 |
21.12 |
| 2026-05-20 00:00 |
05:46:29.52 |
+15:14:40.7 |
HIP 27310 |
16.07 |
| 2026-05-20 12:00 |
05:47:04.14 |
+15:13:12.2 |
HIP 27310 |
14.64 |
| 2026-05-21 00:00 |
05:47:38.77 |
+15:11:43.2 |
HIP 27310 |
17.72 |
| 2026-05-21 12:00 |
05:48:13.42 |
+15:10:13.7 |
HIP 27310 |
23.63 |
| 2026-05-22 00:00 |
05:48:48.09 |
+15:08:43.7 |
HIP 27544 |
23.22 |
| 2026-05-22 12:00 |
05:49:22.77 |
+15:07:13.2 |
HIP 27544 |
16.74 |
| 2026-05-23 00:00 |
05:49:57.46 |
+15:05:42.2 |
HIP 27544 |
12.89 |
| 2026-05-23 12:00 |
05:50:32.17 |
+15:04:10.6 |
HIP 27544 |
14.03 |
| 2026-05-24 00:00 |
05:51:06.89 |
+15:02:38.5 |
HIP 27544 |
19.31 |
| 2026-05-24 12:00 |
05:51:41.63 |
+15:01:05.9 |
HIP 27802 |
20.94 |
| 2026-05-25 00:00 |
05:52:16.37 |
+14:59:32.8 |
HIP 27802 |
14.95 |
| 2026-05-25 12:00 |
05:52:51.13 |
+14:57:59.2 |
HIP 27802 |
12.42 |
| 2026-05-26 00:00 |
05:53:25.90 |
+14:56:25.0 |
HIP 27802 |
15.20 |
| 2026-05-26 12:00 |
05:54:00.67 |
+14:54:50.2 |
HIP 27802 |
21.31 |
| 2026-05-27 00:00 |
05:54:35.46 |
+14:53:15.0 |
HIP 27802 |
28.70 |
| 2026-05-27 12:00 |
05:55:10.25 |
+14:51:39.2 |
HIP 27856 |
34.25 |
| 2026-05-28 00:00 |
05:55:45.05 |
+14:50:02.8 |
HIP 28225 |
31.28 |
| 2026-05-28 12:00 |
05:56:19.86 |
+14:48:25.9 |
HIP 28225 |
22.77 |
| 2026-05-29 00:00 |
05:56:54.67 |
+14:46:48.4 |
HIP 28225 |
14.34 |
| 2026-05-29 12:00 |
05:57:29.49 |
+14:45:10.4 |
HIP 28225 |
6.26 |
| 2026-05-30 00:00 |
05:58:04.32 |
+14:43:31.8 |
HIP 28225 |
4.47 |
| 2026-05-30 12:00 |
05:58:39.15 |
+14:41:52.7 |
HIP 28225 |
12.16 |
| 2026-05-31 00:00 |
05:59:13.98 |
+14:40:13.0 |
HIP 28314 |
19.50 |
| 2026-05-31 12:00 |
05:59:48.82 |
+14:38:32.7 |
HIP 28314 |
21.37 |
| 2026-06-01 00:00 |
06:00:23.66 |
+14:36:51.8 |
HIP 28473 |
20.99 |
| 2026-06-01 12:00 |
06:00:58.50 |
+14:35:10.4 |
HIP 28473 |
22.64 |
| 2026-06-02 00:00 |
06:01:33.35 |
+14:33:28.4 |
HIP 28663 |
25.80 |