メタデータ
| 項目 |
値 |
| Designation |
C/2019 Y5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-08-18T04:08:32.138880Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:12:31Z |
| Obs used |
70 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
7.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-12-28T05:41:07.382400Z |
| Discovery magnitude (MPC) |
21.47 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) |
2020-07-16.0000000 |
| e |
0.99391885 |
| q (au) |
4.914443 |
| a (au) |
808.144135 |
| i (deg) |
82.832615 |
| Ω (om, deg) |
51.777609 |
| ω (w, deg) |
303.500296 |
| M (ma, deg) |
0.014279 |
等級
散乱 + 全体線形
$$
M_a = (9.916 + 4.210\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.916 |
| n |
4.210 |
| gf |
0.998 |
| gb |
-0.918 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
01:27:11.49 |
+70:33:00.2 |
HIP 6737 |
10.03 |
| 2026-03-26 12:00 |
01:27:28.37 |
+70:33:06.5 |
HIP 6737 |
10.54 |
| 2026-03-27 00:00 |
01:27:45.28 |
+70:33:13.5 |
HIP 6737 |
11.22 |
| 2026-03-27 12:00 |
01:28:02.24 |
+70:33:21.2 |
HIP 6737 |
12.05 |
| 2026-03-28 00:00 |
01:28:19.24 |
+70:33:29.7 |
HIP 6737 |
12.98 |
| 2026-03-28 12:00 |
01:28:36.28 |
+70:33:38.8 |
HIP 6737 |
14.01 |
| 2026-03-29 00:00 |
01:28:53.36 |
+70:33:48.7 |
HIP 6737 |
15.12 |
| 2026-03-29 12:00 |
01:29:10.47 |
+70:33:59.3 |
HIP 6737 |
16.29 |
| 2026-03-30 00:00 |
01:29:27.63 |
+70:34:10.6 |
HIP 6737 |
17.51 |
| 2026-03-30 12:00 |
01:29:44.82 |
+70:34:22.6 |
HIP 6737 |
18.77 |
| 2026-03-31 00:00 |
01:30:02.05 |
+70:34:35.3 |
HIP 7078 |
19.64 |
| 2026-03-31 12:00 |
01:30:19.31 |
+70:34:48.7 |
HIP 7078 |
19.46 |
| 2026-04-01 00:00 |
01:30:36.61 |
+70:35:02.8 |
HIP 7078 |
19.41 |
| 2026-04-01 12:00 |
01:30:53.94 |
+70:35:17.7 |
HIP 7078 |
19.48 |
| 2026-04-02 00:00 |
01:31:11.31 |
+70:35:33.2 |
HIP 7078 |
19.67 |
| 2026-04-02 12:00 |
01:31:28.70 |
+70:35:49.4 |
HIP 7078 |
19.98 |
| 2026-04-03 00:00 |
01:31:46.13 |
+70:36:06.4 |
HIP 7078 |
20.40 |
| 2026-04-03 12:00 |
01:32:03.59 |
+70:36:24.0 |
HIP 7078 |
20.94 |
| 2026-04-04 00:00 |
01:32:21.08 |
+70:36:42.3 |
HIP 7078 |
21.57 |
| 2026-04-04 12:00 |
01:32:38.60 |
+70:37:01.3 |
HIP 7078 |
22.30 |
| 2026-04-05 00:00 |
01:32:56.15 |
+70:37:21.1 |
HIP 7078 |
23.12 |
| 2026-04-05 12:00 |
01:33:13.73 |
+70:37:41.5 |
HIP 7078 |
24.01 |
| 2026-04-06 00:00 |
01:33:31.33 |
+70:38:02.6 |
HIP 7078 |
24.98 |
| 2026-04-06 12:00 |
01:33:48.96 |
+70:38:24.4 |
HIP 7471 |
25.17 |
| 2026-04-07 00:00 |
01:34:06.61 |
+70:38:46.8 |
HIP 7471 |
24.84 |
| 2026-04-07 12:00 |
01:34:24.29 |
+70:39:10.0 |
HIP 7471 |
24.61 |
| 2026-04-08 00:00 |
01:34:42.00 |
+70:39:33.9 |
HIP 7471 |
24.49 |
| 2026-04-08 12:00 |
01:34:59.72 |
+70:39:58.4 |
HIP 7471 |
24.47 |
| 2026-04-09 00:00 |
01:35:17.47 |
+70:40:23.6 |
HIP 7471 |
24.57 |
| 2026-04-09 12:00 |
01:35:35.24 |
+70:40:49.6 |
HIP 7471 |
24.76 |
| 2026-04-10 00:00 |
01:35:53.04 |
+70:41:16.2 |
HIP 7471 |
25.07 |
| 2026-04-10 12:00 |
01:36:10.85 |
+70:41:43.4 |
HIP 7471 |
25.47 |
| 2026-04-11 00:00 |
01:36:28.68 |
+70:42:11.4 |
HIP 7471 |
25.98 |
| 2026-04-11 12:00 |
01:36:46.53 |
+70:42:40.0 |
HIP 7471 |
26.57 |
| 2026-04-12 00:00 |
01:37:04.40 |
+70:43:09.3 |
HIP 7471 |
27.26 |
| 2026-04-12 12:00 |
01:37:22.29 |
+70:43:39.3 |
HIP 7471 |
28.03 |
| 2026-04-13 00:00 |
01:37:40.19 |
+70:44:09.9 |
HIP 8016 |
26.97 |
| 2026-04-13 12:00 |
01:37:58.11 |
+70:44:41.3 |
HIP 8016 |
25.68 |
| 2026-04-14 00:00 |
01:38:16.04 |
+70:45:13.3 |
HIP 8016 |
24.43 |
| 2026-04-14 12:00 |
01:38:33.98 |
+70:45:45.9 |
HIP 8016 |
23.21 |
| 2026-04-15 00:00 |
01:38:51.94 |
+70:46:19.3 |
HIP 8016 |
22.05 |
| 2026-04-15 12:00 |
01:39:09.91 |
+70:46:53.3 |
HIP 8016 |
20.95 |
| 2026-04-16 00:00 |
01:39:27.89 |
+70:47:27.9 |
HIP 8016 |
19.92 |