メタデータ
| 項目 |
値 |
| Designation |
P/2019 A4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-12-05T05:23:53.433600Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:45:21Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-10T08:46:05.376000Z |
| Discovery magnitude (MPC) |
20.60 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) |
2019-01-18.0000000 |
| e |
0.08960737 |
| q (au) |
2.379288 |
| a (au) |
2.613474 |
| i (deg) |
13.318898 |
| Ω (om, deg) |
119.300120 |
| ω (w, deg) |
341.836468 |
| M (ma, deg) |
10.211830 |
等級
散乱 + 全体線形
$$
M_a = (13.420 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.420 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.849 |
| k |
0.999 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
03:53:37.97 |
+01:58:36.4 |
HIP 18190 |
8.76 |
| 2026-09-20 12:00 |
03:53:46.60 |
+01:56:12.3 |
HIP 18190 |
11.69 |
| 2026-09-21 00:00 |
03:53:54.83 |
+01:53:47.1 |
HIP 18190 |
14.71 |
| 2026-09-21 12:00 |
03:54:02.68 |
+01:51:20.8 |
HIP 18292 |
17.21 |
| 2026-09-22 00:00 |
03:54:10.12 |
+01:48:53.4 |
HIP 18292 |
18.38 |
| 2026-09-22 12:00 |
03:54:17.17 |
+01:46:25.0 |
HIP 18292 |
20.01 |
| 2026-09-23 00:00 |
03:54:23.82 |
+01:43:55.5 |
HIP 18292 |
21.97 |
| 2026-09-23 12:00 |
03:54:30.07 |
+01:41:25.0 |
HIP 18203 |
22.69 |
| 2026-09-24 00:00 |
03:54:35.92 |
+01:38:53.6 |
HIP 18203 |
21.72 |
| 2026-09-24 12:00 |
03:54:41.37 |
+01:36:21.2 |
HIP 18203 |
21.03 |
| 2026-09-25 00:00 |
03:54:46.40 |
+01:33:47.8 |
HIP 18261 |
19.03 |
| 2026-09-25 12:00 |
03:54:51.03 |
+01:31:13.6 |
HIP 18261 |
17.06 |
| 2026-09-26 00:00 |
03:54:55.25 |
+01:28:38.4 |
HIP 18261 |
15.28 |
| 2026-09-26 12:00 |
03:54:59.06 |
+01:26:02.4 |
HIP 18261 |
13.77 |
| 2026-09-27 00:00 |
03:55:02.46 |
+01:23:25.5 |
HIP 18261 |
12.59 |
| 2026-09-27 12:00 |
03:55:05.44 |
+01:20:47.9 |
HIP 18261 |
11.85 |
| 2026-09-28 00:00 |
03:55:08.00 |
+01:18:09.4 |
HIP 18261 |
11.60 |
| 2026-09-28 12:00 |
03:55:10.15 |
+01:15:30.2 |
HIP 18261 |
11.88 |
| 2026-09-29 00:00 |
03:55:11.88 |
+01:12:50.2 |
HIP 18261 |
12.64 |
| 2026-09-29 12:00 |
03:55:13.19 |
+01:10:09.5 |
HIP 18261 |
13.81 |
| 2026-09-30 00:00 |
03:55:14.08 |
+01:07:28.1 |
HIP 18261 |
15.28 |
| 2026-09-30 12:00 |
03:55:14.54 |
+01:04:46.1 |
HIP 18261 |
16.98 |
| 2026-10-01 00:00 |
03:55:14.58 |
+01:02:03.4 |
HIP 18239 |
17.53 |
| 2026-10-01 12:00 |
03:55:14.19 |
+00:59:20.1 |
HIP 18239 |
17.33 |
| 2026-10-02 00:00 |
03:55:13.37 |
+00:56:36.3 |
HIP 18239 |
17.44 |
| 2026-10-02 12:00 |
03:55:12.12 |
+00:53:51.9 |
HIP 18239 |
17.88 |
| 2026-10-03 00:00 |
03:55:10.44 |
+00:51:07.1 |
HIP 18408 |
16.77 |
| 2026-10-03 12:00 |
03:55:08.34 |
+00:48:21.8 |
HIP 18408 |
16.06 |
| 2026-10-04 00:00 |
03:55:05.79 |
+00:45:36.0 |
HIP 18408 |
15.92 |
| 2026-10-04 12:00 |
03:55:02.82 |
+00:42:49.9 |
HIP 18408 |
16.39 |
| 2026-10-05 00:00 |
03:54:59.41 |
+00:40:03.4 |
HIP 18408 |
17.44 |
| 2026-10-05 12:00 |
03:54:55.57 |
+00:37:16.5 |
HIP 18408 |
18.99 |
| 2026-10-06 00:00 |
03:54:51.29 |
+00:34:29.4 |
HIP 18408 |
20.94 |
| 2026-10-06 12:00 |
03:54:46.58 |
+00:31:42.1 |
HIP 18408 |
23.21 |
| 2026-10-07 00:00 |
03:54:41.43 |
+00:28:54.5 |
HIP 18408 |
25.73 |
| 2026-10-07 12:00 |
03:54:35.85 |
+00:26:06.8 |
HIP 18408 |
28.45 |
| 2026-10-08 00:00 |
03:54:29.83 |
+00:23:19.0 |
HIP 18226 |
28.29 |
| 2026-10-08 12:00 |
03:54:23.38 |
+00:20:31.1 |
HIP 18226 |
25.10 |
| 2026-10-09 00:00 |
03:54:16.49 |
+00:17:43.2 |
HIP 18226 |
21.89 |
| 2026-10-09 12:00 |
03:54:09.17 |
+00:14:55.3 |
HIP 18226 |
18.67 |
| 2026-10-10 00:00 |
03:54:01.41 |
+00:12:07.5 |
HIP 18226 |
15.49 |
| 2026-10-10 12:00 |
03:53:53.23 |
+00:09:19.8 |
HIP 18226 |
12.41 |
| 2026-10-11 00:00 |
03:53:44.61 |
+00:06:32.2 |
HIP 18226 |
9.62 |