C/2019 A5 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
18:08:45.44 |
+38:12:17.0 |
HIP 88972 |
18.37 |
| 2026-02-03 12:00 |
18:08:55.76 |
+38:13:18.1 |
HIP 88972 |
16.43 |
| 2026-02-04 00:00 |
18:09:06.01 |
+38:14:19.8 |
HIP 88972 |
14.59 |
| 2026-02-04 12:00 |
18:09:16.21 |
+38:15:22.2 |
HIP 88972 |
12.87 |
| 2026-02-05 00:00 |
18:09:26.35 |
+38:16:25.3 |
HIP 88972 |
11.33 |
| 2026-02-05 12:00 |
18:09:36.43 |
+38:17:29.0 |
HIP 88972 |
10.05 |
| 2026-02-06 00:00 |
18:09:46.45 |
+38:18:33.4 |
HIP 88972 |
9.14 |
| 2026-02-06 12:00 |
18:09:56.41 |
+38:19:38.5 |
HIP 88972 |
8.71 |
| 2026-02-07 00:00 |
18:10:06.31 |
+38:20:44.2 |
HIP 88972 |
8.82 |
| 2026-02-07 12:00 |
18:10:16.15 |
+38:21:50.5 |
HIP 88972 |
9.45 |
| 2026-02-08 00:00 |
18:10:25.92 |
+38:22:57.5 |
HIP 88972 |
10.50 |
| 2026-02-08 12:00 |
18:10:35.63 |
+38:24:05.2 |
HIP 88972 |
11.87 |
| 2026-02-09 00:00 |
18:10:45.28 |
+38:25:13.4 |
HIP 88972 |
13.44 |
| 2026-02-09 12:00 |
18:10:54.86 |
+38:26:22.3 |
HIP 88972 |
15.16 |
| 2026-02-10 00:00 |
18:11:04.39 |
+38:27:31.9 |
HIP 88972 |
16.98 |
| 2026-02-10 12:00 |
18:11:13.84 |
+38:28:42.0 |
HIP 89237 |
17.71 |
| 2026-02-11 00:00 |
18:11:23.23 |
+38:29:52.8 |
HIP 89237 |
15.56 |
| 2026-02-11 12:00 |
18:11:32.56 |
+38:31:04.2 |
HIP 89237 |
13.42 |
| 2026-02-12 00:00 |
18:11:41.81 |
+38:32:16.1 |
HIP 89237 |
11.32 |
| 2026-02-12 12:00 |
18:11:51.00 |
+38:33:28.7 |
HIP 89237 |
9.24 |
| 2026-02-13 00:00 |
18:12:00.13 |
+38:34:41.9 |
HIP 89237 |
7.24 |
| 2026-02-13 12:00 |
18:12:09.18 |
+38:35:55.6 |
HIP 89237 |
5.38 |
| 2026-02-14 00:00 |
18:12:18.17 |
+38:37:10.0 |
HIP 89237 |
3.86 |
| 2026-02-14 12:00 |
18:12:27.08 |
+38:38:24.9 |
HIP 89237 |
3.18 |
| 2026-02-15 00:00 |
18:12:35.93 |
+38:39:40.4 |
HIP 89237 |
3.82 |
| 2026-02-15 12:00 |
18:12:44.71 |
+38:40:56.4 |
HIP 89237 |
5.32 |
| 2026-02-16 00:00 |
18:12:53.42 |
+38:42:13.0 |
HIP 89279 |
4.74 |
| 2026-02-16 12:00 |
18:13:02.05 |
+38:43:30.2 |
HIP 89279 |
2.95 |
| 2026-02-17 00:00 |
18:13:10.61 |
+38:44:47.9 |
HIP 89279 |
1.97 |
| 2026-02-17 12:00 |
18:13:19.11 |
+38:46:06.2 |
HIP 89279 |
2.80 |
| 2026-02-18 00:00 |
18:13:27.52 |
+38:47:25.0 |
HIP 89279 |
4.54 |
| 2026-02-18 12:00 |
18:13:35.87 |
+38:48:44.3 |
HIP 89279 |
6.48 |
| 2026-02-19 00:00 |
18:13:44.14 |
+38:50:04.1 |
HIP 89279 |
8.49 |
| 2026-02-19 12:00 |
18:13:52.34 |
+38:51:24.5 |
HIP 89279 |
10.52 |
| 2026-02-20 00:00 |
18:14:00.46 |
+38:52:45.3 |
HIP 89279 |
12.56 |
| 2026-02-20 12:00 |
18:14:08.50 |
+38:54:06.7 |
HIP 89279 |
14.60 |
| 2026-02-21 00:00 |
18:14:16.48 |
+38:55:28.6 |
HIP 89279 |
16.64 |
| 2026-02-21 12:00 |
18:14:24.37 |
+38:56:50.9 |
HIP 89279 |
18.68 |
| 2026-02-22 00:00 |
18:14:32.19 |
+38:58:13.7 |
HIP 89528 |
18.30 |
| 2026-02-22 12:00 |
18:14:39.93 |
+38:59:37.0 |
HIP 89528 |
16.68 |
| 2026-02-23 00:00 |
18:14:47.59 |
+39:01:00.8 |
HIP 89528 |
15.18 |
| 2026-02-23 12:00 |
18:14:55.18 |
+39:02:25.0 |
HIP 89528 |
13.84 |
| 2026-02-24 00:00 |
18:15:02.69 |
+39:03:49.7 |
HIP 89528 |
12.69 |