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
$$
M_a = (15.430 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.430 |
| n |
2.000 |
| gf |
0.981 |
| gb |
-0.546 |
| k |
1.000 |
| δ90 |
9.996 |
| 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) |
| 2026-03-26 00:00 |
03:16:16.86 |
+53:06:59.6 |
HIP 15179 |
22.79 |
| 2026-03-26 12:00 |
03:16:22.16 |
+53:06:36.8 |
HIP 15179 |
22.65 |
| 2026-03-27 00:00 |
03:16:27.50 |
+53:06:14.4 |
HIP 15179 |
22.55 |
| 2026-03-27 12:00 |
03:16:32.88 |
+53:05:52.3 |
HIP 15179 |
22.49 |
| 2026-03-28 00:00 |
03:16:38.29 |
+53:05:30.5 |
HIP 15179 |
22.48 |
| 2026-03-28 12:00 |
03:16:43.75 |
+53:05:09.0 |
HIP 15179 |
22.50 |
| 2026-03-29 00:00 |
03:16:49.24 |
+53:04:47.8 |
HIP 15179 |
22.57 |
| 2026-03-29 12:00 |
03:16:54.77 |
+53:04:27.0 |
HIP 15179 |
22.69 |
| 2026-03-30 00:00 |
03:17:00.34 |
+53:04:06.5 |
HIP 15179 |
22.84 |
| 2026-03-30 12:00 |
03:17:05.95 |
+53:03:46.3 |
HIP 15179 |
23.04 |
| 2026-03-31 00:00 |
03:17:11.59 |
+53:03:26.5 |
HIP 15179 |
23.28 |
| 2026-03-31 12:00 |
03:17:17.27 |
+53:03:06.9 |
HIP 15179 |
23.57 |
| 2026-04-01 00:00 |
03:17:22.98 |
+53:02:47.7 |
HIP 15179 |
23.89 |
| 2026-04-01 12:00 |
03:17:28.73 |
+53:02:28.9 |
HIP 15179 |
24.25 |
| 2026-04-02 00:00 |
03:17:34.52 |
+53:02:10.3 |
HIP 15179 |
24.64 |
| 2026-04-02 12:00 |
03:17:40.34 |
+53:01:52.1 |
HIP 15179 |
25.07 |
| 2026-04-03 00:00 |
03:17:46.19 |
+53:01:34.2 |
HIP 15179 |
25.54 |
| 2026-04-03 12:00 |
03:17:52.08 |
+53:01:16.6 |
HIP 15179 |
26.04 |
| 2026-04-04 00:00 |
03:17:58.00 |
+53:00:59.3 |
HIP 15179 |
26.57 |
| 2026-04-04 12:00 |
03:18:03.96 |
+53:00:42.4 |
HIP 15179 |
27.13 |
| 2026-04-05 00:00 |
03:18:09.95 |
+53:00:25.8 |
HIP 15179 |
27.71 |
| 2026-04-05 12:00 |
03:18:15.97 |
+53:00:09.5 |
HIP 15179 |
28.33 |
| 2026-04-06 00:00 |
03:18:22.02 |
+52:59:53.5 |
HIP 15179 |
28.97 |
| 2026-04-06 12:00 |
03:18:28.10 |
+52:59:37.9 |
HIP 15179 |
29.63 |
| 2026-04-07 00:00 |
03:18:34.22 |
+52:59:22.6 |
HIP 15179 |
30.31 |
| 2026-04-07 12:00 |
03:18:40.37 |
+52:59:07.6 |
HIP 15179 |
31.02 |
| 2026-04-08 00:00 |
03:18:46.54 |
+52:58:53.0 |
HIP 15666 |
31.02 |
| 2026-04-08 12:00 |
03:18:52.75 |
+52:58:38.7 |
HIP 15666 |
30.09 |
| 2026-04-09 00:00 |
03:18:58.99 |
+52:58:24.7 |
HIP 15666 |
29.15 |
| 2026-04-09 12:00 |
03:19:05.26 |
+52:58:11.0 |
HIP 15666 |
28.22 |
| 2026-04-10 00:00 |
03:19:11.55 |
+52:57:57.7 |
HIP 15666 |
27.29 |
| 2026-04-10 12:00 |
03:19:17.88 |
+52:57:44.6 |
HIP 15666 |
26.36 |
| 2026-04-11 00:00 |
03:19:24.23 |
+52:57:31.9 |
HIP 15666 |
25.44 |
| 2026-04-11 12:00 |
03:19:30.61 |
+52:57:19.6 |
HIP 15666 |
24.52 |
| 2026-04-12 00:00 |
03:19:37.02 |
+52:57:07.5 |
HIP 15666 |
23.60 |
| 2026-04-12 12:00 |
03:19:43.46 |
+52:56:55.8 |
HIP 15666 |
22.69 |
| 2026-04-13 00:00 |
03:19:49.92 |
+52:56:44.5 |
HIP 15666 |
21.79 |
| 2026-04-13 12:00 |
03:19:56.41 |
+52:56:33.4 |
HIP 15666 |
20.90 |
| 2026-04-14 00:00 |
03:20:02.92 |
+52:56:22.7 |
HIP 15666 |
20.01 |
| 2026-04-14 12:00 |
03:20:09.46 |
+52:56:12.3 |
HIP 15666 |
19.14 |
| 2026-04-15 00:00 |
03:20:16.03 |
+52:56:02.2 |
HIP 15666 |
18.28 |
| 2026-04-15 12:00 |
03:20:22.62 |
+52:55:52.4 |
HIP 15666 |
17.44 |
| 2026-04-16 00:00 |
03:20:29.23 |
+52:55:43.0 |
HIP 15666 |
16.61 |