C/2015 X5 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2015 X5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-12-31T00:50:40.139520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:20Z |
| Obs used |
227 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
10.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-07-11.0000000 |
| e |
1.00304318 |
| q (au) |
6.801746 |
| a (au) |
-2235.080422 |
| i (deg) |
124.284533 |
| Ω (om, deg) |
122.311473 |
| ω (w, deg) |
27.750506 |
| M (ma, deg) |
-0.001614 |
等級
散乱 + 全体線形
$$
M_a = (6.073 + 3.992\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.073 |
| n |
3.992 |
| gf |
0.967 |
| gb |
-0.501 |
| k |
1.000 |
| δ90 |
9.960 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2015-12-06 |
2017-12-23 |
+1.9144 |
-1.449 |
| 2018-01-05 |
2020-02-14 |
-8.6346 |
+7.072 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:25:43.85 |
+22:55:48.5 |
HIP 105875 |
11.77 |
| 2026-02-03 12:00 |
21:25:49.83 |
+22:55:49.4 |
HIP 105875 |
10.41 |
| 2026-02-04 00:00 |
21:25:55.80 |
+22:55:50.8 |
HIP 105875 |
9.04 |
| 2026-02-04 12:00 |
21:26:01.78 |
+22:55:52.7 |
HIP 105875 |
7.67 |
| 2026-02-05 00:00 |
21:26:07.75 |
+22:55:55.1 |
HIP 105875 |
6.30 |
| 2026-02-05 12:00 |
21:26:13.73 |
+22:55:58.0 |
HIP 105875 |
4.94 |
| 2026-02-06 00:00 |
21:26:19.71 |
+22:56:01.4 |
HIP 105875 |
3.59 |
| 2026-02-06 12:00 |
21:26:25.69 |
+22:56:05.3 |
HIP 105875 |
2.27 |
| 2026-02-07 00:00 |
21:26:31.67 |
+22:56:09.7 |
HIP 105875 |
1.09 |
| 2026-02-07 12:00 |
21:26:37.64 |
+22:56:14.6 |
HIP 105875 |
1.00 |
| 2026-02-08 00:00 |
21:26:43.62 |
+22:56:20.0 |
HIP 105875 |
2.15 |
| 2026-02-08 12:00 |
21:26:49.59 |
+22:56:25.9 |
HIP 105875 |
3.47 |
| 2026-02-09 00:00 |
21:26:55.56 |
+22:56:32.3 |
HIP 105875 |
4.82 |
| 2026-02-09 12:00 |
21:27:01.53 |
+22:56:39.2 |
HIP 105875 |
6.18 |
| 2026-02-10 00:00 |
21:27:07.50 |
+22:56:46.5 |
HIP 105875 |
7.55 |
| 2026-02-10 12:00 |
21:27:13.46 |
+22:56:54.3 |
HIP 105875 |
8.92 |
| 2026-02-11 00:00 |
21:27:19.42 |
+22:57:02.7 |
HIP 105875 |
10.29 |
| 2026-02-11 12:00 |
21:27:25.37 |
+22:57:11.5 |
HIP 105875 |
11.66 |
| 2026-02-12 00:00 |
21:27:31.32 |
+22:57:20.7 |
HIP 105875 |
13.03 |
| 2026-02-12 12:00 |
21:27:37.27 |
+22:57:30.5 |
HIP 105875 |
14.40 |
| 2026-02-13 00:00 |
21:27:43.21 |
+22:57:40.7 |
HIP 105875 |
15.78 |
| 2026-02-13 12:00 |
21:27:49.14 |
+22:57:51.4 |
HIP 105875 |
17.15 |
| 2026-02-14 00:00 |
21:27:55.07 |
+22:58:02.6 |
HIP 105875 |
18.52 |
| 2026-02-14 12:00 |
21:28:00.99 |
+22:58:14.2 |
HIP 105875 |
19.89 |
| 2026-02-15 00:00 |
21:28:06.90 |
+22:58:26.3 |
HIP 105875 |
21.26 |
| 2026-02-15 12:00 |
21:28:12.80 |
+22:58:38.9 |
HIP 105875 |
22.63 |
| 2026-02-16 00:00 |
21:28:18.70 |
+22:58:51.9 |
HIP 105875 |
24.00 |
| 2026-02-16 12:00 |
21:28:24.58 |
+22:59:05.4 |
HIP 105875 |
25.37 |
| 2026-02-17 00:00 |
21:28:30.46 |
+22:59:19.3 |
HIP 105875 |
26.74 |
| 2026-02-17 12:00 |
21:28:36.33 |
+22:59:33.7 |
HIP 105875 |
28.11 |
| 2026-02-18 00:00 |
21:28:42.19 |
+22:59:48.5 |
HIP 105875 |
29.47 |
| 2026-02-18 12:00 |
21:28:48.03 |
+23:00:03.8 |
HIP 105875 |
30.83 |
| 2026-02-19 00:00 |
21:28:53.87 |
+23:00:19.5 |
HIP 105875 |
32.20 |
| 2026-02-19 12:00 |
21:28:59.70 |
+23:00:35.7 |
HIP 105875 |
33.56 |
| 2026-02-20 00:00 |
21:29:05.51 |
+23:00:52.3 |
HIP 106231 |
32.92 |
| 2026-02-20 12:00 |
21:29:11.31 |
+23:01:09.3 |
HIP 106231 |
31.68 |
| 2026-02-21 00:00 |
21:29:17.10 |
+23:01:26.8 |
HIP 106231 |
30.44 |
| 2026-02-21 12:00 |
21:29:22.88 |
+23:01:44.7 |
HIP 106231 |
29.22 |
| 2026-02-22 00:00 |
21:29:28.64 |
+23:02:03.1 |
HIP 106231 |
28.00 |
| 2026-02-22 12:00 |
21:29:34.38 |
+23:02:21.8 |
HIP 106231 |
26.80 |
| 2026-02-23 00:00 |
21:29:40.12 |
+23:02:41.0 |
HIP 106231 |
25.61 |
| 2026-02-23 12:00 |
21:29:45.84 |
+23:03:00.6 |
HIP 106231 |
24.43 |
| 2026-02-24 00:00 |
21:29:51.54 |
+23:03:20.6 |
HIP 106231 |
23.27 |