メタデータ
| 項目 |
値 |
| Designation |
C/2023 X7 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-05-14T20:10:57.051840Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T16:42:14Z |
| Obs used |
69 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-12-10T09:19:12.489600Z |
| Discovery magnitude (MPC) |
20.42 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-01-10.0000000 |
| e |
1.00204616 |
| q (au) |
4.821645 |
| a (au) |
-2356.440748 |
| i (deg) |
69.055573 |
| Ω (om, deg) |
119.207283 |
| ω (w, deg) |
354.334373 |
| M (ma, deg) |
-0.004229 |
等級
散乱 + 全体線形
$$
M_a = (9.949 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.949 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.942 |
| k |
0.800 |
| δ90 |
9.716 |
| 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 |
09:05:28.79 |
+51:47:56.6 |
HIP 44752 |
19.14 |
| 2026-05-12 12:00 |
09:05:45.12 |
+51:47:05.4 |
HIP 44752 |
16.55 |
| 2026-05-13 00:00 |
09:06:01.65 |
+51:46:13.7 |
HIP 44752 |
13.97 |
| 2026-05-13 12:00 |
09:06:18.39 |
+51:45:21.7 |
HIP 44752 |
11.41 |
| 2026-05-14 00:00 |
09:06:35.33 |
+51:44:29.2 |
HIP 44752 |
8.94 |
| 2026-05-14 12:00 |
09:06:52.48 |
+51:43:36.3 |
HIP 44752 |
6.66 |
| 2026-05-15 00:00 |
09:07:09.83 |
+51:42:43.1 |
HIP 44752 |
4.95 |
| 2026-05-15 12:00 |
09:07:27.38 |
+51:41:49.5 |
HIP 44752 |
4.56 |
| 2026-05-16 00:00 |
09:07:45.13 |
+51:40:55.5 |
HIP 44752 |
5.81 |
| 2026-05-16 12:00 |
09:08:03.08 |
+51:40:01.2 |
HIP 44752 |
8.00 |
| 2026-05-17 00:00 |
09:08:21.23 |
+51:39:06.5 |
HIP 44901 |
5.60 |
| 2026-05-17 12:00 |
09:08:39.57 |
+51:38:11.5 |
HIP 44901 |
2.76 |
| 2026-05-18 00:00 |
09:08:58.11 |
+51:37:16.1 |
HIP 44901 |
1.33 |
| 2026-05-18 12:00 |
09:09:16.84 |
+51:36:20.4 |
HIP 44901 |
3.80 |
| 2026-05-19 00:00 |
09:09:35.76 |
+51:35:24.4 |
HIP 44901 |
6.79 |
| 2026-05-19 12:00 |
09:09:54.87 |
+51:34:28.1 |
HIP 44901 |
9.87 |
| 2026-05-20 00:00 |
09:10:14.16 |
+51:33:31.5 |
HIP 44901 |
13.00 |
| 2026-05-20 12:00 |
09:10:33.65 |
+51:32:34.7 |
HIP 44901 |
16.16 |
| 2026-05-21 00:00 |
09:10:53.31 |
+51:31:37.5 |
HIP 44901 |
19.36 |
| 2026-05-21 12:00 |
09:11:13.17 |
+51:30:40.1 |
HIP 45253 |
20.35 |
| 2026-05-22 00:00 |
09:11:33.20 |
+51:29:42.4 |
HIP 45253 |
17.41 |
| 2026-05-22 12:00 |
09:11:53.41 |
+51:28:44.4 |
HIP 45253 |
14.59 |
| 2026-05-23 00:00 |
09:12:13.80 |
+51:27:46.2 |
HIP 45253 |
11.98 |
| 2026-05-23 12:00 |
09:12:34.37 |
+51:26:47.7 |
HIP 45253 |
9.78 |
| 2026-05-24 00:00 |
09:12:55.12 |
+51:25:49.0 |
HIP 45253 |
8.37 |
| 2026-05-24 12:00 |
09:13:16.03 |
+51:24:50.1 |
HIP 45253 |
8.19 |
| 2026-05-25 00:00 |
09:13:37.13 |
+51:23:51.0 |
HIP 45253 |
9.36 |
| 2026-05-25 12:00 |
09:13:58.39 |
+51:22:51.6 |
HIP 45253 |
11.48 |
| 2026-05-26 00:00 |
09:14:19.82 |
+51:21:52.0 |
HIP 45253 |
14.17 |
| 2026-05-26 12:00 |
09:14:41.42 |
+51:20:52.2 |
HIP 45253 |
17.16 |
| 2026-05-27 00:00 |
09:15:03.18 |
+51:19:52.2 |
HIP 45557 |
19.44 |
| 2026-05-27 12:00 |
09:15:25.12 |
+51:18:52.0 |
HIP 45557 |
16.01 |
| 2026-05-28 00:00 |
09:15:47.21 |
+51:17:51.6 |
HIP 45557 |
12.64 |
| 2026-05-28 12:00 |
09:16:09.47 |
+51:16:51.0 |
HIP 45557 |
9.41 |
| 2026-05-29 00:00 |
09:16:31.89 |
+51:15:50.3 |
HIP 45557 |
6.58 |
| 2026-05-29 12:00 |
09:16:54.47 |
+51:14:49.3 |
HIP 45557 |
4.95 |
| 2026-05-30 00:00 |
09:17:17.21 |
+51:13:48.2 |
HIP 45557 |
5.73 |
| 2026-05-30 12:00 |
09:17:40.10 |
+51:12:47.0 |
HIP 45557 |
8.30 |
| 2026-05-31 00:00 |
09:18:03.15 |
+51:11:45.5 |
HIP 45557 |
11.53 |
| 2026-05-31 12:00 |
09:18:26.36 |
+51:10:43.9 |
HIP 45557 |
15.03 |
| 2026-06-01 00:00 |
09:18:49.72 |
+51:09:42.2 |
HIP 45557 |
18.66 |
| 2026-06-01 12:00 |
09:19:13.23 |
+51:08:40.3 |
HIP 45836 |
15.94 |
| 2026-06-02 00:00 |
09:19:36.90 |
+51:07:38.3 |
HIP 45836 |
13.37 |