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 |
0.979 |
| gb |
-0.502 |
| k |
1.000 |
| δ90 |
9.991 |
| 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) |
| 2026-09-20 00:00 |
00:39:52.58 |
-49:22:27.2 |
HIP 3048 |
13.40 |
| 2026-09-20 12:00 |
00:39:15.83 |
-49:22:23.9 |
HIP 3048 |
9.14 |
| 2026-09-21 00:00 |
00:38:39.09 |
-49:22:17.6 |
HIP 3048 |
7.72 |
| 2026-09-21 12:00 |
00:38:02.37 |
-49:22:08.3 |
HIP 3048 |
10.38 |
| 2026-09-22 00:00 |
00:37:25.68 |
-49:21:56.1 |
HIP 3048 |
15.10 |
| 2026-09-22 12:00 |
00:36:49.01 |
-49:21:40.8 |
HIP 2888 |
13.89 |
| 2026-09-23 00:00 |
00:36:12.39 |
-49:21:22.6 |
HIP 2848 |
13.78 |
| 2026-09-23 12:00 |
00:35:35.80 |
-49:21:01.4 |
HIP 2848 |
14.13 |
| 2026-09-24 00:00 |
00:34:59.26 |
-49:20:37.3 |
HIP 2848 |
16.72 |
| 2026-09-24 12:00 |
00:34:22.76 |
-49:20:10.1 |
HIP 2848 |
20.73 |
| 2026-09-25 00:00 |
00:33:46.33 |
-49:19:40.0 |
HIP 2848 |
25.49 |
| 2026-09-25 12:00 |
00:33:09.95 |
-49:19:06.9 |
HIP 2747 |
29.53 |
| 2026-09-26 00:00 |
00:32:33.64 |
-49:18:30.9 |
HIP 2472 |
32.33 |
| 2026-09-26 12:00 |
00:31:57.40 |
-49:17:51.9 |
HIP 2472 |
30.13 |
| 2026-09-27 00:00 |
00:31:21.23 |
-49:17:09.9 |
HIP 2261 |
27.17 |
| 2026-09-27 12:00 |
00:30:45.15 |
-49:16:25.0 |
HIP 2261 |
21.56 |
| 2026-09-28 00:00 |
00:30:09.15 |
-49:15:37.2 |
HIP 2261 |
16.18 |
| 2026-09-28 12:00 |
00:29:33.23 |
-49:14:46.4 |
HIP 2261 |
11.33 |
| 2026-09-29 00:00 |
00:28:57.42 |
-49:13:52.7 |
HIP 2261 |
8.02 |
| 2026-09-29 12:00 |
00:28:21.70 |
-49:12:56.1 |
HIP 2261 |
8.35 |
| 2026-09-30 00:00 |
00:27:46.09 |
-49:11:56.6 |
HIP 2261 |
12.01 |
| 2026-09-30 12:00 |
00:27:10.58 |
-49:10:54.1 |
HIP 2261 |
16.96 |
| 2026-10-01 00:00 |
00:26:35.19 |
-49:09:48.8 |
HIP 2107 |
18.70 |
| 2026-10-01 12:00 |
00:25:59.91 |
-49:08:40.5 |
HIP 2107 |
21.06 |
| 2026-10-02 00:00 |
00:25:24.76 |
-49:07:29.4 |
HIP 1880 |
21.62 |
| 2026-10-02 12:00 |
00:24:49.73 |
-49:06:15.5 |
HIP 1880 |
18.64 |
| 2026-10-03 00:00 |
00:24:14.83 |
-49:04:58.6 |
HIP 1801 |
15.12 |
| 2026-10-03 12:00 |
00:23:40.07 |
-49:03:38.9 |
HIP 1801 |
11.03 |
| 2026-10-04 00:00 |
00:23:05.45 |
-49:02:16.4 |
HIP 1801 |
9.16 |
| 2026-10-04 12:00 |
00:22:30.98 |
-49:00:51.0 |
HIP 1705 |
10.44 |
| 2026-10-05 00:00 |
00:21:56.65 |
-48:59:22.9 |
HIP 1705 |
4.77 |
| 2026-10-05 12:00 |
00:21:22.47 |
-48:57:51.9 |
HIP 1705 |
2.10 |
| 2026-10-06 00:00 |
00:20:48.46 |
-48:56:18.1 |
HIP 1705 |
7.32 |
| 2026-10-06 12:00 |
00:20:14.60 |
-48:54:41.6 |
HIP 1705 |
13.03 |
| 2026-10-07 00:00 |
00:19:40.91 |
-48:53:02.3 |
HIP 1516 |
14.28 |
| 2026-10-07 12:00 |
00:19:07.39 |
-48:51:20.2 |
HIP 1516 |
14.02 |
| 2026-10-08 00:00 |
00:18:34.04 |
-48:49:35.4 |
HIP 1516 |
16.01 |
| 2026-10-08 12:00 |
00:18:00.87 |
-48:47:47.9 |
HIP 1516 |
19.58 |
| 2026-10-09 00:00 |
00:17:27.89 |
-48:45:57.6 |
HIP 1516 |
24.03 |
| 2026-10-09 12:00 |
00:16:55.09 |
-48:44:04.7 |
HIP 1516 |
28.94 |
| 2026-10-10 00:00 |
00:16:22.48 |
-48:42:09.1 |
HIP 1101 |
25.99 |
| 2026-10-10 12:00 |
00:15:50.06 |
-48:40:10.9 |
HIP 1101 |
20.65 |
| 2026-10-11 00:00 |
00:15:17.84 |
-48:38:10.1 |
HIP 1101 |
15.58 |