メタデータ
| 項目 |
値 |
| Designation |
C/2015 K4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-05-01T18:22:16.573440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:11Z |
| Obs used |
134 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
12.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-06-08.0000000 |
| e |
1.00011201 |
| q (au) |
2.007657 |
| a (au) |
-17923.123229 |
| i (deg) |
80.254532 |
| Ω (om, deg) |
250.771183 |
| ω (w, deg) |
357.538399 |
| M (ma, deg) |
0.000015 |
等級
散乱 + 全体線形
$$
M_a = (15.431 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.431 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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 |
03:31:23.65 |
+53:03:01.1 |
HIP 16316 |
13.62 |
| 2026-06-01 12:00 |
03:31:30.66 |
+53:03:18.7 |
HIP 16316 |
14.60 |
| 2026-06-02 00:00 |
03:31:37.65 |
+53:03:36.5 |
HIP 16316 |
15.60 |
| 2026-06-02 12:00 |
03:31:44.63 |
+53:03:54.6 |
HIP 16575 |
16.22 |
| 2026-06-03 00:00 |
03:31:51.59 |
+53:04:12.9 |
HIP 16575 |
15.41 |
| 2026-06-03 12:00 |
03:31:58.54 |
+53:04:31.4 |
HIP 16575 |
14.64 |
| 2026-06-04 00:00 |
03:32:05.47 |
+53:04:50.2 |
HIP 16575 |
13.92 |
| 2026-06-04 12:00 |
03:32:12.38 |
+53:05:09.2 |
HIP 16575 |
13.26 |
| 2026-06-05 00:00 |
03:32:19.28 |
+53:05:28.4 |
HIP 16575 |
12.65 |
| 2026-06-05 12:00 |
03:32:26.15 |
+53:05:47.9 |
HIP 16575 |
12.12 |
| 2026-06-06 00:00 |
03:32:33.01 |
+53:06:07.6 |
HIP 16575 |
11.67 |
| 2026-06-06 12:00 |
03:32:39.86 |
+53:06:27.5 |
HIP 16575 |
11.31 |
| 2026-06-07 00:00 |
03:32:46.68 |
+53:06:47.6 |
HIP 16575 |
11.05 |
| 2026-06-07 12:00 |
03:32:53.48 |
+53:07:08.0 |
HIP 16575 |
10.90 |
| 2026-06-08 00:00 |
03:33:00.27 |
+53:07:28.6 |
HIP 16575 |
10.86 |
| 2026-06-08 12:00 |
03:33:07.03 |
+53:07:49.4 |
HIP 16575 |
10.92 |
| 2026-06-09 00:00 |
03:33:13.78 |
+53:08:10.5 |
HIP 16575 |
11.10 |
| 2026-06-09 12:00 |
03:33:20.50 |
+53:08:31.7 |
HIP 16575 |
11.38 |
| 2026-06-10 00:00 |
03:33:27.21 |
+53:08:53.2 |
HIP 16575 |
11.75 |
| 2026-06-10 12:00 |
03:33:33.89 |
+53:09:14.9 |
HIP 16575 |
12.21 |
| 2026-06-11 00:00 |
03:33:40.55 |
+53:09:36.8 |
HIP 16575 |
12.74 |
| 2026-06-11 12:00 |
03:33:47.19 |
+53:09:58.9 |
HIP 16575 |
13.34 |
| 2026-06-12 00:00 |
03:33:53.80 |
+53:10:21.3 |
HIP 16575 |
14.00 |
| 2026-06-12 12:00 |
03:34:00.39 |
+53:10:43.8 |
HIP 16575 |
14.71 |
| 2026-06-13 00:00 |
03:34:06.96 |
+53:11:06.6 |
HIP 16575 |
15.45 |
| 2026-06-13 12:00 |
03:34:13.51 |
+53:11:29.5 |
HIP 16575 |
16.24 |
| 2026-06-14 00:00 |
03:34:20.03 |
+53:11:52.7 |
HIP 16575 |
17.05 |
| 2026-06-14 12:00 |
03:34:26.52 |
+53:12:16.1 |
HIP 16575 |
17.89 |
| 2026-06-15 00:00 |
03:34:32.99 |
+53:12:39.7 |
HIP 16575 |
18.76 |
| 2026-06-15 12:00 |
03:34:39.43 |
+53:13:03.5 |
HIP 16575 |
19.64 |
| 2026-06-16 00:00 |
03:34:45.85 |
+53:13:27.4 |
HIP 16575 |
20.53 |
| 2026-06-16 12:00 |
03:34:52.24 |
+53:13:51.6 |
HIP 16575 |
21.44 |
| 2026-06-17 00:00 |
03:34:58.61 |
+53:14:16.0 |
HIP 16575 |
22.36 |
| 2026-06-17 12:00 |
03:35:04.95 |
+53:14:40.6 |
HIP 16820 |
22.40 |
| 2026-06-18 00:00 |
03:35:11.25 |
+53:15:05.3 |
HIP 16820 |
22.25 |
| 2026-06-18 12:00 |
03:35:17.54 |
+53:15:30.3 |
HIP 16820 |
22.16 |
| 2026-06-19 00:00 |
03:35:23.79 |
+53:15:55.4 |
HIP 16820 |
22.12 |
| 2026-06-19 12:00 |
03:35:30.01 |
+53:16:20.7 |
HIP 16820 |
22.13 |
| 2026-06-20 00:00 |
03:35:36.21 |
+53:16:46.2 |
HIP 16820 |
22.19 |
| 2026-06-20 12:00 |
03:35:42.37 |
+53:17:11.9 |
HIP 16820 |
22.30 |
| 2026-06-21 00:00 |
03:35:48.51 |
+53:17:37.8 |
HIP 16820 |
22.47 |
| 2026-06-21 12:00 |
03:35:54.61 |
+53:18:03.9 |
HIP 16820 |
22.68 |
| 2026-06-22 00:00 |
03:36:00.68 |
+53:18:30.1 |
HIP 16820 |
22.94 |