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) |
| 2026-03-26 00:00 |
00:36:59.59 |
-46:32:36.1 |
HIP 2803 |
17.45 |
| 2026-03-26 12:00 |
00:37:30.42 |
-46:28:04.0 |
HIP 2803 |
19.89 |
| 2026-03-27 00:00 |
00:38:01.14 |
-46:23:34.2 |
HIP 2803 |
24.17 |
| 2026-03-27 12:00 |
00:38:31.76 |
-46:19:06.6 |
HIP 3020 |
25.03 |
| 2026-03-28 00:00 |
00:39:02.28 |
-46:14:41.3 |
HIP 3020 |
21.47 |
| 2026-03-28 12:00 |
00:39:32.70 |
-46:10:18.2 |
HIP 3245 |
19.24 |
| 2026-03-29 00:00 |
00:40:03.01 |
-46:05:57.4 |
HIP 3245 |
13.30 |
| 2026-03-29 12:00 |
00:40:33.22 |
-46:01:38.9 |
HIP 3245 |
8.75 |
| 2026-03-30 00:00 |
00:41:03.34 |
-45:57:22.6 |
HIP 3245 |
8.22 |
| 2026-03-30 12:00 |
00:41:33.35 |
-45:53:08.5 |
HIP 3245 |
12.20 |
| 2026-03-31 00:00 |
00:42:03.25 |
-45:48:56.7 |
HIP 3376 |
9.18 |
| 2026-03-31 12:00 |
00:42:33.06 |
-45:44:47.2 |
HIP 3376 |
4.44 |
| 2026-04-01 00:00 |
00:43:02.77 |
-45:40:39.9 |
HIP 3376 |
6.58 |
| 2026-04-01 12:00 |
00:43:32.37 |
-45:36:34.8 |
HIP 3376 |
12.39 |
| 2026-04-02 00:00 |
00:44:01.87 |
-45:32:32.0 |
HIP 3318 |
18.12 |
| 2026-04-02 12:00 |
00:44:31.28 |
-45:28:31.4 |
HIP 3595 |
16.12 |
| 2026-04-03 00:00 |
00:45:00.58 |
-45:24:33.1 |
HIP 3595 |
12.51 |
| 2026-04-03 12:00 |
00:45:29.77 |
-45:20:37.0 |
HIP 3595 |
11.69 |
| 2026-04-04 00:00 |
00:45:58.87 |
-45:16:43.1 |
HIP 3595 |
14.11 |
| 2026-04-04 12:00 |
00:46:27.87 |
-45:12:51.5 |
HIP 3543 |
17.24 |
| 2026-04-05 00:00 |
00:46:56.76 |
-45:09:02.2 |
HIP 3543 |
19.46 |
| 2026-04-05 12:00 |
00:47:25.55 |
-45:05:15.0 |
HIP 3756 |
14.80 |
| 2026-04-06 00:00 |
00:47:54.24 |
-45:01:30.2 |
HIP 3756 |
9.11 |
| 2026-04-06 12:00 |
00:48:22.83 |
-44:57:47.5 |
HIP 3756 |
5.20 |
| 2026-04-07 00:00 |
00:48:51.32 |
-44:54:07.1 |
HIP 3756 |
7.04 |
| 2026-04-07 12:00 |
00:49:19.71 |
-44:50:28.9 |
HIP 3756 |
12.23 |
| 2026-04-08 00:00 |
00:49:47.99 |
-44:46:53.0 |
HIP 3756 |
18.05 |
| 2026-04-08 12:00 |
00:50:16.17 |
-44:43:19.4 |
HIP 3756 |
24.02 |
| 2026-04-09 00:00 |
00:50:44.24 |
-44:39:47.9 |
HIP 4001 |
18.97 |
| 2026-04-09 12:00 |
00:51:12.22 |
-44:36:18.7 |
HIP 4001 |
14.34 |
| 2026-04-10 00:00 |
00:51:40.09 |
-44:32:51.8 |
HIP 4001 |
11.22 |
| 2026-04-10 12:00 |
00:52:07.86 |
-44:29:27.1 |
HIP 4001 |
10.94 |
| 2026-04-11 00:00 |
00:52:35.52 |
-44:26:04.7 |
HIP 4163 |
10.30 |
| 2026-04-11 12:00 |
00:53:03.08 |
-44:22:44.5 |
HIP 4163 |
11.59 |
| 2026-04-12 00:00 |
00:53:30.54 |
-44:19:26.6 |
HIP 4163 |
15.23 |
| 2026-04-12 12:00 |
00:53:57.89 |
-44:16:10.9 |
HIP 4309 |
14.48 |
| 2026-04-13 00:00 |
00:54:25.13 |
-44:12:57.4 |
HIP 4309 |
12.39 |
| 2026-04-13 12:00 |
00:54:52.27 |
-44:09:46.3 |
HIP 4309 |
12.84 |
| 2026-04-14 00:00 |
00:55:19.30 |
-44:06:37.4 |
HIP 4309 |
15.57 |
| 2026-04-14 12:00 |
00:55:46.23 |
-44:03:30.7 |
HIP 4309 |
19.62 |
| 2026-04-15 00:00 |
00:56:13.05 |
-44:00:26.3 |
HIP 4537 |
21.62 |
| 2026-04-15 12:00 |
00:56:39.76 |
-43:57:24.1 |
HIP 4537 |
18.74 |
| 2026-04-16 00:00 |
00:57:06.37 |
-43:54:24.3 |
HIP 4537 |
17.29 |