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) |
| 2026-03-26 00:00 |
04:47:53.95 |
+17:28:36.7 |
HIP 22224 |
22.41 |
| 2026-03-26 12:00 |
04:48:21.53 |
+17:27:23.6 |
HIP 22224 |
28.08 |
| 2026-03-27 00:00 |
04:48:49.22 |
+17:26:10.9 |
HIP 22485 |
25.64 |
| 2026-03-27 12:00 |
04:49:17.03 |
+17:24:58.4 |
HIP 22496 |
20.46 |
| 2026-03-28 00:00 |
04:49:44.95 |
+17:23:46.3 |
HIP 22496 |
14.87 |
| 2026-03-28 12:00 |
04:50:12.98 |
+17:22:34.5 |
HIP 22496 |
10.73 |
| 2026-03-29 00:00 |
04:50:41.13 |
+17:21:23.0 |
HIP 22496 |
10.10 |
| 2026-03-29 12:00 |
04:51:09.39 |
+17:20:11.8 |
HIP 22496 |
13.51 |
| 2026-03-30 00:00 |
04:51:37.75 |
+17:19:00.9 |
HIP 22676 |
14.12 |
| 2026-03-30 12:00 |
04:52:06.23 |
+17:17:50.2 |
HIP 22676 |
7.61 |
| 2026-03-31 00:00 |
04:52:34.81 |
+17:16:39.7 |
HIP 22676 |
3.38 |
| 2026-03-31 12:00 |
04:53:03.50 |
+17:15:29.5 |
HIP 22676 |
7.82 |
| 2026-04-01 00:00 |
04:53:32.29 |
+17:14:19.6 |
HIP 22676 |
14.42 |
| 2026-04-01 12:00 |
04:54:01.19 |
+17:13:09.8 |
HIP 22782 |
11.56 |
| 2026-04-02 00:00 |
04:54:30.19 |
+17:12:00.3 |
HIP 22782 |
12.26 |
| 2026-04-02 12:00 |
04:54:59.29 |
+17:10:50.9 |
HIP 22782 |
16.32 |
| 2026-04-03 00:00 |
04:55:28.49 |
+17:09:41.8 |
HIP 22782 |
21.97 |
| 2026-04-03 12:00 |
04:55:57.79 |
+17:08:32.8 |
HIP 23043 |
20.21 |
| 2026-04-04 00:00 |
04:56:27.19 |
+17:07:24.0 |
HIP 23043 |
13.30 |
| 2026-04-04 12:00 |
04:56:56.69 |
+17:06:15.3 |
HIP 23043 |
6.81 |
| 2026-04-05 00:00 |
04:57:26.28 |
+17:05:06.8 |
HIP 23043 |
4.21 |
| 2026-04-05 12:00 |
04:57:55.97 |
+17:03:58.5 |
HIP 23043 |
9.60 |
| 2026-04-06 00:00 |
04:58:25.76 |
+17:02:50.2 |
HIP 23043 |
16.44 |
| 2026-04-06 12:00 |
04:58:55.64 |
+17:01:42.1 |
HIP 23227 |
18.21 |
| 2026-04-07 00:00 |
04:59:25.61 |
+17:00:34.1 |
HIP 23227 |
12.65 |
| 2026-04-07 12:00 |
04:59:55.68 |
+16:59:26.2 |
HIP 23227 |
9.69 |
| 2026-04-08 00:00 |
05:00:25.83 |
+16:58:18.4 |
HIP 23227 |
11.58 |
| 2026-04-08 12:00 |
05:00:56.08 |
+16:57:10.7 |
HIP 23227 |
16.78 |
| 2026-04-09 00:00 |
05:01:26.41 |
+16:56:03.1 |
HIP 23227 |
23.18 |
| 2026-04-09 12:00 |
05:01:56.84 |
+16:54:55.5 |
HIP 23504 |
29.01 |
| 2026-04-10 00:00 |
05:02:27.35 |
+16:53:47.9 |
HIP 23504 |
26.07 |
| 2026-04-10 12:00 |
05:02:57.95 |
+16:52:40.5 |
HIP 23574 |
21.90 |
| 2026-04-11 00:00 |
05:03:28.63 |
+16:51:33.0 |
HIP 23574 |
18.21 |
| 2026-04-11 12:00 |
05:03:59.40 |
+16:50:25.6 |
HIP 23574 |
17.13 |
| 2026-04-12 00:00 |
05:04:30.25 |
+16:49:18.2 |
HIP 23574 |
19.15 |
| 2026-04-12 12:00 |
05:05:01.19 |
+16:48:10.8 |
HIP 23574 |
23.48 |
| 2026-04-13 00:00 |
05:05:32.21 |
+16:47:03.4 |
HIP 23807 |
21.50 |
| 2026-04-13 12:00 |
05:06:03.31 |
+16:45:55.9 |
HIP 23807 |
14.39 |
| 2026-04-14 00:00 |
05:06:34.49 |
+16:44:48.5 |
HIP 23810 |
7.99 |
| 2026-04-14 12:00 |
05:07:05.75 |
+16:43:41.0 |
HIP 23810 |
5.61 |
| 2026-04-15 00:00 |
05:07:37.08 |
+16:42:33.5 |
HIP 23810 |
10.68 |
| 2026-04-15 12:00 |
05:08:08.50 |
+16:41:26.0 |
HIP 23810 |
17.67 |
| 2026-04-16 00:00 |
05:08:39.99 |
+16:40:18.4 |
HIP 23810 |
25.04 |