メタデータ
| 項目 |
値 |
| Designation |
C/2015 A1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-13T01:22:02.553600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:05Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
32.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-03-29.0000000 |
| e |
0.90081449 |
| q (au) |
1.995505 |
| a (au) |
20.118914 |
| i (deg) |
80.365746 |
| Ω (om, deg) |
341.085968 |
| ω (w, deg) |
244.879299 |
| M (ma, deg) |
0.174128 |
等級
散乱 + 全体線形
$$
M_a = (13.204 + 4.454\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.204 |
| n |
4.454 |
| gf |
1.000 |
| gb |
-0.664 |
| 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 |
22:22:01.80 |
+34:06:02.3 |
HIP 110389 |
13.00 |
| 2026-06-01 12:00 |
22:22:00.97 |
+34:07:01.5 |
HIP 110389 |
13.82 |
| 2026-06-02 00:00 |
22:22:00.09 |
+34:08:00.4 |
HIP 110389 |
14.65 |
| 2026-06-02 12:00 |
22:21:59.15 |
+34:08:59.1 |
HIP 110389 |
15.49 |
| 2026-06-03 00:00 |
22:21:58.17 |
+34:09:57.6 |
HIP 110389 |
16.35 |
| 2026-06-03 12:00 |
22:21:57.14 |
+34:10:55.9 |
HIP 110389 |
17.21 |
| 2026-06-04 00:00 |
22:21:56.05 |
+34:11:54.0 |
HIP 110389 |
18.08 |
| 2026-06-04 12:00 |
22:21:54.92 |
+34:12:51.9 |
HIP 110389 |
18.96 |
| 2026-06-05 00:00 |
22:21:53.73 |
+34:13:49.5 |
HIP 110389 |
19.84 |
| 2026-06-05 12:00 |
22:21:52.50 |
+34:14:46.9 |
HIP 110389 |
20.73 |
| 2026-06-06 00:00 |
22:21:51.21 |
+34:15:44.1 |
HIP 110389 |
21.62 |
| 2026-06-06 12:00 |
22:21:49.88 |
+34:16:41.0 |
HIP 110389 |
22.51 |
| 2026-06-07 00:00 |
22:21:48.49 |
+34:17:37.7 |
HIP 110389 |
23.41 |
| 2026-06-07 12:00 |
22:21:47.05 |
+34:18:34.2 |
HIP 110389 |
24.31 |
| 2026-06-08 00:00 |
22:21:45.57 |
+34:19:30.4 |
HIP 110389 |
25.21 |
| 2026-06-08 12:00 |
22:21:44.03 |
+34:20:26.4 |
HIP 110389 |
26.11 |
| 2026-06-09 00:00 |
22:21:42.44 |
+34:21:22.1 |
HIP 110389 |
27.01 |
| 2026-06-09 12:00 |
22:21:40.81 |
+34:22:17.5 |
HIP 110389 |
27.91 |
| 2026-06-10 00:00 |
22:21:39.12 |
+34:23:12.7 |
HIP 110389 |
28.81 |
| 2026-06-10 12:00 |
22:21:37.38 |
+34:24:07.6 |
HIP 110389 |
29.71 |
| 2026-06-11 00:00 |
22:21:35.59 |
+34:25:02.3 |
HIP 110194 |
29.19 |
| 2026-06-11 12:00 |
22:21:33.75 |
+34:25:56.7 |
HIP 110194 |
28.61 |
| 2026-06-12 00:00 |
22:21:31.86 |
+34:26:50.7 |
HIP 110194 |
28.04 |
| 2026-06-12 12:00 |
22:21:29.93 |
+34:27:44.6 |
HIP 110194 |
27.48 |
| 2026-06-13 00:00 |
22:21:27.94 |
+34:28:38.1 |
HIP 110194 |
26.94 |
| 2026-06-13 12:00 |
22:21:25.90 |
+34:29:31.3 |
HIP 110194 |
26.41 |
| 2026-06-14 00:00 |
22:21:23.81 |
+34:30:24.3 |
HIP 110194 |
25.90 |
| 2026-06-14 12:00 |
22:21:21.67 |
+34:31:16.9 |
HIP 110194 |
25.41 |
| 2026-06-15 00:00 |
22:21:19.49 |
+34:32:09.2 |
HIP 110194 |
24.94 |
| 2026-06-15 12:00 |
22:21:17.25 |
+34:33:01.3 |
HIP 110194 |
24.49 |
| 2026-06-16 00:00 |
22:21:14.96 |
+34:33:53.0 |
HIP 110194 |
24.06 |
| 2026-06-16 12:00 |
22:21:12.63 |
+34:34:44.4 |
HIP 110194 |
23.65 |
| 2026-06-17 00:00 |
22:21:10.24 |
+34:35:35.5 |
HIP 110194 |
23.27 |
| 2026-06-17 12:00 |
22:21:07.81 |
+34:36:26.3 |
HIP 110194 |
22.91 |
| 2026-06-18 00:00 |
22:21:05.33 |
+34:37:16.7 |
HIP 110194 |
22.58 |
| 2026-06-18 12:00 |
22:21:02.79 |
+34:38:06.8 |
HIP 110194 |
22.27 |
| 2026-06-19 00:00 |
22:21:00.21 |
+34:38:56.6 |
HIP 110194 |
21.99 |
| 2026-06-19 12:00 |
22:20:57.59 |
+34:39:46.1 |
HIP 110194 |
21.75 |
| 2026-06-20 00:00 |
22:20:54.91 |
+34:40:35.2 |
HIP 110194 |
21.53 |
| 2026-06-20 12:00 |
22:20:52.18 |
+34:41:24.0 |
HIP 110194 |
21.35 |
| 2026-06-21 00:00 |
22:20:49.41 |
+34:42:12.4 |
HIP 110194 |
21.20 |
| 2026-06-21 12:00 |
22:20:46.59 |
+34:43:00.5 |
HIP 110194 |
21.08 |
| 2026-06-22 00:00 |
22:20:43.72 |
+34:43:48.2 |
HIP 110194 |
21.00 |