C/2023 X7 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
09:29:19.29 |
+47:31:29.2 |
HIP 46497 |
20.29 |
| 2026-02-03 12:00 |
09:28:57.34 |
+47:36:26.5 |
HIP 46351 |
21.90 |
| 2026-02-04 00:00 |
09:28:35.32 |
+47:41:21.4 |
HIP 46351 |
16.58 |
| 2026-02-04 12:00 |
09:28:13.23 |
+47:46:13.9 |
HIP 46351 |
12.07 |
| 2026-02-05 00:00 |
09:27:51.07 |
+47:51:03.9 |
HIP 46351 |
9.56 |
| 2026-02-05 12:00 |
09:27:28.85 |
+47:55:51.4 |
HIP 46351 |
10.52 |
| 2026-02-06 00:00 |
09:27:06.57 |
+48:00:36.4 |
HIP 46351 |
14.24 |
| 2026-02-06 12:00 |
09:26:44.24 |
+48:05:18.8 |
HIP 46351 |
19.14 |
| 2026-02-07 00:00 |
09:26:21.85 |
+48:09:58.7 |
HIP 46351 |
24.50 |
| 2026-02-07 12:00 |
09:25:59.43 |
+48:14:36.0 |
HIP 46361 |
28.76 |
| 2026-02-08 00:00 |
09:25:36.96 |
+48:19:10.7 |
HIP 46361 |
26.62 |
| 2026-02-08 12:00 |
09:25:14.45 |
+48:23:42.8 |
HIP 46361 |
25.71 |
| 2026-02-09 00:00 |
09:24:51.92 |
+48:28:12.2 |
HIP 45960 |
24.96 |
| 2026-02-09 12:00 |
09:24:29.36 |
+48:32:39.1 |
HIP 45960 |
22.43 |
| 2026-02-10 00:00 |
09:24:06.77 |
+48:37:03.2 |
HIP 45960 |
21.22 |
| 2026-02-10 12:00 |
09:23:44.18 |
+48:41:24.7 |
HIP 45960 |
21.51 |
| 2026-02-11 00:00 |
09:23:21.56 |
+48:45:43.5 |
HIP 45960 |
23.23 |
| 2026-02-11 12:00 |
09:22:58.94 |
+48:49:59.6 |
HIP 45828 |
23.43 |
| 2026-02-12 00:00 |
09:22:36.32 |
+48:54:13.0 |
HIP 45828 |
19.26 |
| 2026-02-12 12:00 |
09:22:13.71 |
+48:58:23.7 |
HIP 45828 |
16.02 |
| 2026-02-13 00:00 |
09:21:51.09 |
+49:02:31.6 |
HIP 45828 |
14.29 |
| 2026-02-13 12:00 |
09:21:28.50 |
+49:06:36.8 |
HIP 45828 |
14.58 |
| 2026-02-14 00:00 |
09:21:05.91 |
+49:10:39.2 |
HIP 45828 |
16.75 |
| 2026-02-14 12:00 |
09:20:43.35 |
+49:14:38.9 |
HIP 45828 |
20.18 |
| 2026-02-15 00:00 |
09:20:20.82 |
+49:18:35.8 |
HIP 45810 |
17.92 |
| 2026-02-15 12:00 |
09:19:58.32 |
+49:22:29.9 |
HIP 45810 |
14.80 |
| 2026-02-16 00:00 |
09:19:35.86 |
+49:26:21.2 |
HIP 45810 |
13.22 |
| 2026-02-16 12:00 |
09:19:13.44 |
+49:30:09.8 |
HIP 45810 |
13.67 |
| 2026-02-17 00:00 |
09:18:51.06 |
+49:33:55.5 |
HIP 45810 |
15.95 |
| 2026-02-17 12:00 |
09:18:28.74 |
+49:37:38.4 |
HIP 45810 |
19.39 |
| 2026-02-18 00:00 |
09:18:06.47 |
+49:41:18.5 |
HIP 45810 |
23.45 |
| 2026-02-18 12:00 |
09:17:44.27 |
+49:44:55.8 |
HIP 45810 |
27.84 |
| 2026-02-19 00:00 |
09:17:22.13 |
+49:48:30.3 |
HIP 45384 |
25.66 |
| 2026-02-19 12:00 |
09:17:00.06 |
+49:52:02.0 |
HIP 45384 |
21.13 |
| 2026-02-20 00:00 |
09:16:38.07 |
+49:55:30.9 |
HIP 45384 |
16.90 |
| 2026-02-20 12:00 |
09:16:16.17 |
+49:58:56.9 |
HIP 45384 |
13.22 |
| 2026-02-21 00:00 |
09:15:54.34 |
+50:02:20.2 |
HIP 45384 |
10.60 |
| 2026-02-21 12:00 |
09:15:32.61 |
+50:05:40.6 |
HIP 45384 |
9.86 |
| 2026-02-22 00:00 |
09:15:10.98 |
+50:08:58.3 |
HIP 45384 |
11.30 |
| 2026-02-22 12:00 |
09:14:49.44 |
+50:12:13.1 |
HIP 45384 |
14.24 |
| 2026-02-23 00:00 |
09:14:28.01 |
+50:15:25.1 |
HIP 45384 |
17.92 |
| 2026-02-23 12:00 |
09:14:06.68 |
+50:18:34.4 |
HIP 45384 |
21.94 |
| 2026-02-24 00:00 |
09:13:45.47 |
+50:21:40.8 |
HIP 45152 |
18.03 |