メタデータ
| 項目 |
値 |
| Designation |
C/2019 A5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-09T10:42:31.567680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:51Z |
| Obs used |
70 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
12.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-13T11:48:30.528000Z |
| Discovery magnitude (MPC) |
21.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-08-06.0000000 |
| e |
0.70787404 |
| q (au) |
6.324147 |
| a (au) |
21.648700 |
| i (deg) |
67.539002 |
| Ω (om, deg) |
146.619252 |
| ω (w, deg) |
356.039843 |
| M (ma, deg) |
0.563158 |
等級
散乱 + 全体線形
$$
M_a = (10.399 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.399 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.862 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
18:16:27.41 |
+42:53:41.6 |
HIP 89693 |
26.66 |
| 2026-05-12 12:00 |
18:16:21.09 |
+42:54:43.4 |
HIP 89693 |
26.90 |
| 2026-05-13 00:00 |
18:16:14.70 |
+42:55:44.5 |
HIP 89693 |
27.24 |
| 2026-05-13 12:00 |
18:16:08.24 |
+42:56:44.7 |
HIP 89336 |
27.10 |
| 2026-05-14 00:00 |
18:16:01.71 |
+42:57:44.2 |
HIP 89336 |
26.08 |
| 2026-05-14 12:00 |
18:15:55.11 |
+42:58:42.9 |
HIP 89336 |
25.11 |
| 2026-05-15 00:00 |
18:15:48.43 |
+42:59:40.8 |
HIP 89336 |
24.18 |
| 2026-05-15 12:00 |
18:15:41.69 |
+43:00:37.9 |
HIP 89336 |
23.30 |
| 2026-05-16 00:00 |
18:15:34.89 |
+43:01:34.2 |
HIP 89336 |
22.48 |
| 2026-05-16 12:00 |
18:15:28.01 |
+43:02:29.7 |
HIP 89336 |
21.72 |
| 2026-05-17 00:00 |
18:15:21.07 |
+43:03:24.3 |
HIP 89336 |
21.04 |
| 2026-05-17 12:00 |
18:15:14.07 |
+43:04:18.1 |
HIP 89336 |
20.44 |
| 2026-05-18 00:00 |
18:15:06.99 |
+43:05:11.1 |
HIP 89336 |
19.92 |
| 2026-05-18 12:00 |
18:14:59.86 |
+43:06:03.3 |
HIP 89336 |
19.50 |
| 2026-05-19 00:00 |
18:14:52.66 |
+43:06:54.5 |
HIP 89336 |
19.18 |
| 2026-05-19 12:00 |
18:14:45.40 |
+43:07:45.0 |
HIP 89317 |
18.44 |
| 2026-05-20 00:00 |
18:14:38.08 |
+43:08:34.6 |
HIP 89317 |
16.89 |
| 2026-05-20 12:00 |
18:14:30.70 |
+43:09:23.3 |
HIP 89317 |
15.35 |
| 2026-05-21 00:00 |
18:14:23.26 |
+43:10:11.1 |
HIP 89317 |
13.82 |
| 2026-05-21 12:00 |
18:14:15.75 |
+43:10:58.1 |
HIP 89317 |
12.31 |
| 2026-05-22 00:00 |
18:14:08.20 |
+43:11:44.2 |
HIP 89317 |
10.81 |
| 2026-05-22 12:00 |
18:14:00.58 |
+43:12:29.4 |
HIP 89317 |
9.35 |
| 2026-05-23 00:00 |
18:13:52.91 |
+43:13:13.7 |
HIP 89317 |
7.94 |
| 2026-05-23 12:00 |
18:13:45.18 |
+43:13:57.1 |
HIP 89317 |
6.62 |
| 2026-05-24 00:00 |
18:13:37.40 |
+43:14:39.6 |
HIP 89317 |
5.45 |
| 2026-05-24 12:00 |
18:13:29.57 |
+43:15:21.3 |
HIP 89317 |
4.55 |
| 2026-05-25 00:00 |
18:13:21.68 |
+43:16:02.0 |
HIP 89317 |
4.12 |
| 2026-05-25 12:00 |
18:13:13.74 |
+43:16:41.8 |
HIP 89317 |
4.28 |
| 2026-05-26 00:00 |
18:13:05.75 |
+43:17:20.6 |
HIP 89317 |
4.99 |
| 2026-05-26 12:00 |
18:12:57.71 |
+43:17:58.6 |
HIP 89317 |
6.06 |
| 2026-05-27 00:00 |
18:12:49.61 |
+43:18:35.6 |
HIP 89317 |
7.34 |
| 2026-05-27 12:00 |
18:12:41.48 |
+43:19:11.7 |
HIP 89317 |
8.73 |
| 2026-05-28 00:00 |
18:12:33.29 |
+43:19:46.9 |
HIP 89317 |
10.19 |
| 2026-05-28 12:00 |
18:12:25.06 |
+43:20:21.2 |
HIP 89317 |
11.69 |
| 2026-05-29 00:00 |
18:12:16.78 |
+43:20:54.5 |
HIP 89317 |
13.22 |
| 2026-05-29 12:00 |
18:12:08.45 |
+43:21:26.8 |
HIP 89317 |
14.78 |
| 2026-05-30 00:00 |
18:12:00.08 |
+43:21:58.2 |
HIP 89317 |
16.35 |
| 2026-05-30 12:00 |
18:11:51.67 |
+43:22:28.7 |
HIP 89317 |
17.93 |
| 2026-05-31 00:00 |
18:11:43.22 |
+43:22:58.2 |
HIP 89317 |
19.52 |
| 2026-05-31 12:00 |
18:11:34.72 |
+43:23:26.7 |
HIP 89317 |
21.12 |
| 2026-06-01 00:00 |
18:11:26.19 |
+43:23:54.3 |
HIP 89317 |
22.73 |
| 2026-06-01 12:00 |
18:11:17.61 |
+43:24:20.9 |
HIP 89317 |
24.34 |
| 2026-06-02 00:00 |
18:11:08.99 |
+43:24:46.6 |
HIP 89317 |
25.96 |