メタデータ
| 項目 |
値 |
| Designation |
C/2015 V1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-12-17T19:17:15.800640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:16Z |
| Obs used |
2145 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
8.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-06-28.0000000 |
| e |
1.00055464 |
| q (au) |
4.266704 |
| a (au) |
-7692.742203 |
| i (deg) |
139.230487 |
| Ω (om, deg) |
197.193756 |
| ω (w, deg) |
179.649665 |
| M (ma, deg) |
-0.000252 |
等級
散乱 + 全体線形
$$
M_a = (10.399 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.399 |
| n |
2.000 |
| gf |
0.821 |
| gb |
-0.500 |
| k |
0.901 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2015-11-02 |
2016-09-21 |
+10.7844 |
-8.539 |
| 2016-09-21 |
2017-03-03 |
+2.3776 |
-2.080 |
| 2017-03-03 |
2017-12-17 |
-9.8282 |
+6.267 |
| 2017-12-17 |
2019-06-11 |
+7.0878 |
-4.329 |
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) |
| 2026-05-12 00:00 |
15:37:06.98 |
-54:40:30.3 |
HIP 76549 |
12.18 |
| 2026-05-12 12:00 |
15:36:55.47 |
-54:40:08.6 |
HIP 76357 |
11.15 |
| 2026-05-13 00:00 |
15:36:43.96 |
-54:39:46.3 |
HIP 76357 |
9.72 |
| 2026-05-13 12:00 |
15:36:32.44 |
-54:39:23.5 |
HIP 76357 |
8.39 |
| 2026-05-14 00:00 |
15:36:20.93 |
-54:39:00.2 |
HIP 76357 |
7.23 |
| 2026-05-14 12:00 |
15:36:09.41 |
-54:38:36.4 |
HIP 76357 |
6.33 |
| 2026-05-15 00:00 |
15:35:57.89 |
-54:38:12.0 |
HIP 76357 |
5.81 |
| 2026-05-15 12:00 |
15:35:46.37 |
-54:37:47.1 |
HIP 76357 |
5.79 |
| 2026-05-16 00:00 |
15:35:34.86 |
-54:37:21.7 |
HIP 76357 |
6.26 |
| 2026-05-16 12:00 |
15:35:23.34 |
-54:36:55.7 |
HIP 76357 |
7.13 |
| 2026-05-17 00:00 |
15:35:11.83 |
-54:36:29.2 |
HIP 76357 |
8.28 |
| 2026-05-17 12:00 |
15:35:00.33 |
-54:36:02.2 |
HIP 76357 |
9.61 |
| 2026-05-18 00:00 |
15:34:48.83 |
-54:35:34.7 |
HIP 76357 |
11.06 |
| 2026-05-18 12:00 |
15:34:37.34 |
-54:35:06.6 |
HIP 76357 |
12.58 |
| 2026-05-19 00:00 |
15:34:25.86 |
-54:34:38.1 |
HIP 76357 |
14.15 |
| 2026-05-19 12:00 |
15:34:14.39 |
-54:34:09.0 |
HIP 76150 |
15.29 |
| 2026-05-20 00:00 |
15:34:02.92 |
-54:33:39.4 |
HIP 76150 |
14.83 |
| 2026-05-20 12:00 |
15:33:51.47 |
-54:33:09.3 |
HIP 76150 |
14.57 |
| 2026-05-21 00:00 |
15:33:40.03 |
-54:32:38.7 |
HIP 76150 |
14.52 |
| 2026-05-21 12:00 |
15:33:28.60 |
-54:32:07.6 |
HIP 76092 |
14.28 |
| 2026-05-22 00:00 |
15:33:17.19 |
-54:31:36.0 |
HIP 76092 |
13.73 |
| 2026-05-22 12:00 |
15:33:05.79 |
-54:31:03.9 |
HIP 76092 |
13.40 |
| 2026-05-23 00:00 |
15:32:54.41 |
-54:30:31.2 |
HIP 76092 |
13.30 |
| 2026-05-23 12:00 |
15:32:43.04 |
-54:29:58.1 |
HIP 76092 |
13.43 |
| 2026-05-24 00:00 |
15:32:31.70 |
-54:29:24.6 |
HIP 76092 |
13.79 |
| 2026-05-24 12:00 |
15:32:20.37 |
-54:28:50.5 |
HIP 76092 |
14.36 |
| 2026-05-25 00:00 |
15:32:09.06 |
-54:28:15.9 |
HIP 76092 |
15.11 |
| 2026-05-25 12:00 |
15:31:57.77 |
-54:27:40.9 |
HIP 76092 |
16.03 |
| 2026-05-26 00:00 |
15:31:46.50 |
-54:27:05.3 |
HIP 76092 |
17.08 |
| 2026-05-26 12:00 |
15:31:35.26 |
-54:26:29.3 |
HIP 76092 |
18.24 |
| 2026-05-27 00:00 |
15:31:24.04 |
-54:25:52.8 |
HIP 76092 |
19.49 |
| 2026-05-27 12:00 |
15:31:12.84 |
-54:25:15.9 |
HIP 76092 |
20.82 |
| 2026-05-28 00:00 |
15:31:01.67 |
-54:24:38.5 |
HIP 76092 |
22.21 |
| 2026-05-28 12:00 |
15:30:50.52 |
-54:24:00.6 |
HIP 76092 |
23.65 |
| 2026-05-29 00:00 |
15:30:39.40 |
-54:23:22.2 |
HIP 76092 |
25.13 |
| 2026-05-29 12:00 |
15:30:28.31 |
-54:22:43.4 |
HIP 76092 |
26.65 |
| 2026-05-30 00:00 |
15:30:17.25 |
-54:22:04.2 |
HIP 76092 |
28.19 |
| 2026-05-30 12:00 |
15:30:06.21 |
-54:21:24.4 |
HIP 75778 |
28.17 |
| 2026-05-31 00:00 |
15:29:55.21 |
-54:20:44.3 |
HIP 75778 |
26.94 |
| 2026-05-31 12:00 |
15:29:44.23 |
-54:20:03.7 |
HIP 75778 |
25.76 |
| 2026-06-01 00:00 |
15:29:33.29 |
-54:19:22.6 |
HIP 75639 |
24.27 |
| 2026-06-01 12:00 |
15:29:22.38 |
-54:18:41.1 |
HIP 75639 |
22.56 |
| 2026-06-02 00:00 |
15:29:11.50 |
-54:17:59.2 |
HIP 75639 |
20.85 |