メタデータ
| 項目 |
値 |
| Designation |
C/2015 K2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-06-08T19:07:06.248640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:11Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
20.700 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-05-26.0000000 |
| e |
0.99444359 |
| q (au) |
1.455282 |
| a (au) |
261.910605 |
| i (deg) |
29.110346 |
| Ω (om, deg) |
223.713883 |
| ω (w, deg) |
15.770089 |
| M (ma, deg) |
359.996792 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 3.100\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
3.100 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
02:05:38.56 |
+18:09:33.9 |
HIP 9824 |
22.66 |
| 2026-06-01 12:00 |
02:05:42.29 |
+18:09:54.5 |
HIP 9824 |
21.91 |
| 2026-06-02 00:00 |
02:05:45.99 |
+18:10:15.0 |
HIP 9824 |
21.19 |
| 2026-06-02 12:00 |
02:05:49.68 |
+18:10:35.4 |
HIP 9824 |
20.48 |
| 2026-06-03 00:00 |
02:05:53.34 |
+18:10:55.8 |
HIP 9824 |
19.80 |
| 2026-06-03 12:00 |
02:05:56.99 |
+18:11:16.1 |
HIP 9824 |
19.14 |
| 2026-06-04 00:00 |
02:06:00.61 |
+18:11:36.3 |
HIP 9824 |
18.51 |
| 2026-06-04 12:00 |
02:06:04.21 |
+18:11:56.5 |
HIP 9824 |
17.90 |
| 2026-06-05 00:00 |
02:06:07.79 |
+18:12:16.5 |
HIP 9824 |
17.33 |
| 2026-06-05 12:00 |
02:06:11.34 |
+18:12:36.5 |
HIP 9824 |
16.79 |
| 2026-06-06 00:00 |
02:06:14.87 |
+18:12:56.4 |
HIP 9824 |
16.28 |
| 2026-06-06 12:00 |
02:06:18.38 |
+18:13:16.2 |
HIP 9824 |
15.81 |
| 2026-06-07 00:00 |
02:06:21.87 |
+18:13:36.0 |
HIP 9824 |
15.38 |
| 2026-06-07 12:00 |
02:06:25.33 |
+18:13:55.6 |
HIP 9824 |
14.99 |
| 2026-06-08 00:00 |
02:06:28.77 |
+18:14:15.2 |
HIP 9824 |
14.65 |
| 2026-06-08 12:00 |
02:06:32.19 |
+18:14:34.7 |
HIP 9824 |
14.36 |
| 2026-06-09 00:00 |
02:06:35.58 |
+18:14:54.1 |
HIP 9824 |
14.11 |
| 2026-06-09 12:00 |
02:06:38.95 |
+18:15:13.4 |
HIP 9824 |
13.91 |
| 2026-06-10 00:00 |
02:06:42.30 |
+18:15:32.6 |
HIP 9824 |
13.77 |
| 2026-06-10 12:00 |
02:06:45.62 |
+18:15:51.7 |
HIP 9824 |
13.67 |
| 2026-06-11 00:00 |
02:06:48.91 |
+18:16:10.8 |
HIP 9824 |
13.63 |
| 2026-06-11 12:00 |
02:06:52.18 |
+18:16:29.7 |
HIP 9824 |
13.64 |
| 2026-06-12 00:00 |
02:06:55.43 |
+18:16:48.5 |
HIP 9824 |
13.70 |
| 2026-06-12 12:00 |
02:06:58.65 |
+18:17:07.3 |
HIP 9824 |
13.81 |
| 2026-06-13 00:00 |
02:07:01.84 |
+18:17:25.9 |
HIP 9824 |
13.96 |
| 2026-06-13 12:00 |
02:07:05.01 |
+18:17:44.5 |
HIP 9824 |
14.16 |
| 2026-06-14 00:00 |
02:07:08.15 |
+18:18:02.9 |
HIP 9824 |
14.39 |
| 2026-06-14 12:00 |
02:07:11.27 |
+18:18:21.2 |
HIP 9824 |
14.67 |
| 2026-06-15 00:00 |
02:07:14.36 |
+18:18:39.5 |
HIP 9824 |
14.98 |
| 2026-06-15 12:00 |
02:07:17.42 |
+18:18:57.6 |
HIP 9824 |
15.32 |
| 2026-06-16 00:00 |
02:07:20.46 |
+18:19:15.6 |
HIP 9824 |
15.68 |
| 2026-06-16 12:00 |
02:07:23.47 |
+18:19:33.5 |
HIP 9824 |
16.08 |
| 2026-06-17 00:00 |
02:07:26.45 |
+18:19:51.3 |
HIP 9824 |
16.49 |
| 2026-06-17 12:00 |
02:07:29.40 |
+18:20:09.0 |
HIP 9824 |
16.93 |
| 2026-06-18 00:00 |
02:07:32.33 |
+18:20:26.6 |
HIP 9824 |
17.38 |
| 2026-06-18 12:00 |
02:07:35.22 |
+18:20:44.1 |
HIP 9824 |
17.85 |
| 2026-06-19 00:00 |
02:07:38.09 |
+18:21:01.4 |
HIP 9824 |
18.33 |
| 2026-06-19 12:00 |
02:07:40.93 |
+18:21:18.7 |
HIP 9824 |
18.82 |
| 2026-06-20 00:00 |
02:07:43.75 |
+18:21:35.8 |
HIP 9824 |
19.33 |
| 2026-06-20 12:00 |
02:07:46.53 |
+18:21:52.8 |
HIP 9824 |
19.84 |
| 2026-06-21 00:00 |
02:07:49.29 |
+18:22:09.7 |
HIP 9824 |
20.35 |
| 2026-06-21 12:00 |
02:07:52.01 |
+18:22:26.5 |
HIP 9924 |
20.73 |
| 2026-06-22 00:00 |
02:07:54.71 |
+18:22:43.1 |
HIP 9924 |
21.06 |