メタデータ
| 項目 |
値 |
| Designation |
C/2025 K3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-12-14T02:34:22.313280Z |
| Orbit solution date (soln_date, UTC) |
2026-03-21T13:42:22Z |
| Obs used |
52 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
9.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-05-23T12:57:29.433600Z |
| Discovery magnitude (MPC) |
22.04 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) |
2025-07-10.0000000 |
| e |
1.00146382 |
| q (au) |
3.470213 |
| a (au) |
-2370.659783 |
| i (deg) |
104.932525 |
| Ω (om, deg) |
350.616653 |
| ω (w, deg) |
188.588460 |
| M (ma, deg) |
-0.010700 |
等級
散乱 + 全体線形
$$
M_a = (6.352 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.352 |
| n |
6.000 |
| gf |
0.995 |
| gb |
-0.887 |
| k |
0.800 |
| δ90 |
9.397 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
18:27:52.01 |
+56:32:26.8 |
HIP 90685 |
30.02 |
| 2026-05-12 12:00 |
18:27:27.42 |
+56:35:18.0 |
HIP 90685 |
34.39 |
| 2026-05-13 00:00 |
18:27:02.59 |
+56:38:07.9 |
HIP 90685 |
38.78 |
| 2026-05-13 12:00 |
18:26:37.51 |
+56:40:56.4 |
HIP 90103 |
43.18 |
| 2026-05-14 00:00 |
18:26:12.20 |
+56:43:43.5 |
HIP 90498 |
42.77 |
| 2026-05-14 12:00 |
18:25:46.64 |
+56:46:29.1 |
HIP 90498 |
41.57 |
| 2026-05-15 00:00 |
18:25:20.84 |
+56:49:13.3 |
HIP 89905 |
38.51 |
| 2026-05-15 12:00 |
18:24:54.80 |
+56:51:56.0 |
HIP 89905 |
35.58 |
| 2026-05-16 00:00 |
18:24:28.53 |
+56:54:37.1 |
HIP 89905 |
32.98 |
| 2026-05-16 12:00 |
18:24:02.02 |
+56:57:16.8 |
HIP 89905 |
30.78 |
| 2026-05-17 00:00 |
18:23:35.27 |
+56:59:54.9 |
HIP 89905 |
29.09 |
| 2026-05-17 12:00 |
18:23:08.29 |
+57:02:31.5 |
HIP 89905 |
27.99 |
| 2026-05-18 00:00 |
18:22:41.08 |
+57:05:06.4 |
HIP 89905 |
27.56 |
| 2026-05-18 12:00 |
18:22:13.64 |
+57:07:39.8 |
HIP 89905 |
27.84 |
| 2026-05-19 00:00 |
18:21:45.97 |
+57:10:11.5 |
HIP 89905 |
28.80 |
| 2026-05-19 12:00 |
18:21:18.08 |
+57:12:41.6 |
HIP 89905 |
30.39 |
| 2026-05-20 00:00 |
18:20:49.95 |
+57:15:10.0 |
HIP 89905 |
32.51 |
| 2026-05-20 12:00 |
18:20:21.61 |
+57:17:36.7 |
HIP 89905 |
35.08 |
| 2026-05-21 00:00 |
18:19:53.04 |
+57:20:01.7 |
HIP 89455 |
36.61 |
| 2026-05-21 12:00 |
18:19:24.26 |
+57:22:25.0 |
HIP 89455 |
32.79 |
| 2026-05-22 00:00 |
18:18:55.25 |
+57:24:46.5 |
HIP 89455 |
29.15 |
| 2026-05-22 12:00 |
18:18:26.04 |
+57:27:06.2 |
HIP 89455 |
25.79 |
| 2026-05-23 00:00 |
18:17:56.60 |
+57:29:24.2 |
HIP 89455 |
22.82 |
| 2026-05-23 12:00 |
18:17:26.96 |
+57:31:40.4 |
HIP 89455 |
20.42 |
| 2026-05-24 00:00 |
18:16:57.11 |
+57:33:54.8 |
HIP 89455 |
18.82 |
| 2026-05-24 12:00 |
18:16:27.05 |
+57:36:07.3 |
HIP 89455 |
18.24 |
| 2026-05-25 00:00 |
18:15:56.78 |
+57:38:17.9 |
HIP 89455 |
18.76 |
| 2026-05-25 12:00 |
18:15:26.31 |
+57:40:26.7 |
HIP 89287 |
20.21 |
| 2026-05-26 00:00 |
18:14:55.65 |
+57:42:33.7 |
HIP 89287 |
15.60 |
| 2026-05-26 12:00 |
18:14:24.78 |
+57:44:38.7 |
HIP 89287 |
10.99 |
| 2026-05-27 00:00 |
18:13:53.72 |
+57:46:41.8 |
HIP 89287 |
6.37 |
| 2026-05-27 12:00 |
18:13:22.46 |
+57:48:42.9 |
HIP 89287 |
1.78 |
| 2026-05-28 00:00 |
18:12:51.01 |
+57:50:42.1 |
HIP 89287 |
2.94 |
| 2026-05-28 12:00 |
18:12:19.37 |
+57:52:39.3 |
HIP 89287 |
7.55 |
| 2026-05-29 00:00 |
18:11:47.55 |
+57:54:34.6 |
HIP 89287 |
12.19 |
| 2026-05-29 12:00 |
18:11:15.54 |
+57:56:27.8 |
HIP 89287 |
16.84 |
| 2026-05-30 00:00 |
18:10:43.35 |
+57:58:19.0 |
HIP 88877 |
16.51 |
| 2026-05-30 12:00 |
18:10:10.98 |
+58:00:08.2 |
HIP 88877 |
12.28 |
| 2026-05-31 00:00 |
18:09:38.44 |
+58:01:55.4 |
HIP 88877 |
8.49 |
| 2026-05-31 12:00 |
18:09:05.72 |
+58:03:40.5 |
HIP 88877 |
6.05 |
| 2026-06-01 00:00 |
18:08:32.83 |
+58:05:23.5 |
HIP 88877 |
6.66 |
| 2026-06-01 12:00 |
18:07:59.78 |
+58:07:04.4 |
HIP 88877 |
9.77 |
| 2026-06-02 00:00 |
18:07:26.56 |
+58:08:43.2 |
HIP 88877 |
13.79 |