C/2025 D5 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2025 D5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-05-13T06:52:41.522880Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:45:07Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
19.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-28T13:02:06.604800Z |
| Discovery magnitude (MPC) |
20.67 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) |
2025-03-05.0000000 |
| e |
0.99937857 |
| q (au) |
2.012182 |
| a (au) |
3237.980838 |
| i (deg) |
73.381837 |
| Ω (om, deg) |
0.738132 |
| ω (w, deg) |
211.490104 |
| M (ma, deg) |
359.999629 |
等級
散乱 + 全体線形
$$
M_a = (18.263 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.263 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.770 |
| 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) |
| 2026-02-03 00:00 |
23:34:52.43 |
-57:34:28.5 |
HIP 116407 |
5.98 |
| 2026-02-03 12:00 |
23:35:35.93 |
-57:26:04.1 |
HIP 116407 |
4.27 |
| 2026-02-04 00:00 |
23:36:19.24 |
-57:17:42.0 |
HIP 116444 |
13.41 |
| 2026-02-04 12:00 |
23:37:02.37 |
-57:09:22.2 |
HIP 116734 |
21.76 |
| 2026-02-05 00:00 |
23:37:45.31 |
-57:01:04.6 |
HIP 116734 |
13.59 |
| 2026-02-05 12:00 |
23:38:28.07 |
-56:52:49.3 |
HIP 116734 |
10.00 |
| 2026-02-06 00:00 |
23:39:10.65 |
-56:44:36.2 |
HIP 116734 |
14.77 |
| 2026-02-06 12:00 |
23:39:53.06 |
-56:36:25.3 |
HIP 116835 |
13.74 |
| 2026-02-07 00:00 |
23:40:35.29 |
-56:28:16.8 |
HIP 116835 |
3.73 |
| 2026-02-07 12:00 |
23:41:17.35 |
-56:20:10.4 |
HIP 116835 |
6.25 |
| 2026-02-08 00:00 |
23:41:59.25 |
-56:12:06.4 |
HIP 116935 |
10.79 |
| 2026-02-08 12:00 |
23:42:40.97 |
-56:04:04.6 |
HIP 116935 |
19.21 |
| 2026-02-09 00:00 |
23:43:22.54 |
-55:56:05.1 |
HIP 116935 |
28.56 |
| 2026-02-09 12:00 |
23:44:03.94 |
-55:48:07.8 |
HIP 117276 |
23.50 |
| 2026-02-10 00:00 |
23:44:45.18 |
-55:40:12.8 |
HIP 117276 |
19.61 |
| 2026-02-10 12:00 |
23:45:26.26 |
-55:32:20.1 |
HIP 117297 |
15.51 |
| 2026-02-11 00:00 |
23:46:07.19 |
-55:24:29.6 |
HIP 117297 |
7.60 |
| 2026-02-11 12:00 |
23:46:47.96 |
-55:16:41.5 |
HIP 117297 |
8.01 |
| 2026-02-12 00:00 |
23:47:28.58 |
-55:08:55.6 |
HIP 117369 |
8.65 |
| 2026-02-12 12:00 |
23:48:09.05 |
-55:01:11.9 |
HIP 117369 |
15.86 |
| 2026-02-13 00:00 |
23:48:49.37 |
-54:53:30.6 |
HIP 117232 |
23.39 |
| 2026-02-13 12:00 |
23:49:29.54 |
-54:45:51.5 |
HIP 117552 |
16.69 |
| 2026-02-14 00:00 |
23:50:09.56 |
-54:38:14.7 |
HIP 117552 |
7.47 |
| 2026-02-14 12:00 |
23:50:49.44 |
-54:30:40.2 |
HIP 117552 |
3.97 |
| 2026-02-15 00:00 |
23:51:29.18 |
-54:23:08.0 |
HIP 117552 |
12.52 |
| 2026-02-15 12:00 |
23:52:08.78 |
-54:15:38.1 |
HIP 117782 |
10.81 |
| 2026-02-16 00:00 |
23:52:48.23 |
-54:08:10.5 |
HIP 117649 |
11.00 |
| 2026-02-16 12:00 |
23:53:27.55 |
-54:00:45.1 |
HIP 117649 |
16.79 |
| 2026-02-17 00:00 |
23:54:06.73 |
-53:53:22.1 |
HIP 117976 |
14.92 |
| 2026-02-17 12:00 |
23:54:45.77 |
-53:46:01.4 |
HIP 117976 |
9.10 |
| 2026-02-18 00:00 |
23:55:24.68 |
-53:38:42.9 |
HIP 117976 |
10.79 |
| 2026-02-18 12:00 |
23:56:03.45 |
-53:31:26.8 |
HIP 117976 |
17.92 |
| 2026-02-19 00:00 |
23:56:42.09 |
-53:24:12.9 |
HIP 117976 |
26.38 |
| 2026-02-19 12:00 |
23:57:20.59 |
-53:17:01.4 |
HIP 50 |
31.09 |
| 2026-02-20 00:00 |
23:57:58.97 |
-53:09:52.1 |
HIP 50 |
23.64 |
| 2026-02-20 12:00 |
23:58:37.21 |
-53:02:45.2 |
HIP 118288 |
14.69 |
| 2026-02-21 00:00 |
23:59:15.33 |
-52:55:40.5 |
HIP 118288 |
5.66 |
| 2026-02-21 12:00 |
23:59:53.31 |
-52:48:38.2 |
HIP 118288 |
3.77 |
| 2026-02-22 00:00 |
00:00:31.17 |
-52:41:38.2 |
HIP 98 |
8.99 |
| 2026-02-22 12:00 |
00:01:08.90 |
-52:34:40.4 |
HIP 98 |
13.26 |
| 2026-02-23 00:00 |
00:01:46.50 |
-52:27:45.0 |
HIP 98 |
20.77 |
| 2026-02-23 12:00 |
00:02:23.98 |
-52:20:51.9 |
HIP 420 |
27.68 |
| 2026-02-24 00:00 |
00:03:01.33 |
-52:14:01.1 |
HIP 420 |
19.97 |