メタデータ
| 項目 |
値 |
| Designation |
C/2019 Q3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-08-20T18:56:05.832960Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:42:43Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
8.700 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-08-29T05:55:28.704000Z |
| Discovery magnitude (MPC) |
21.10 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) |
2019-08-20.0000000 |
| e |
1.00470354 |
| q (au) |
7.250302 |
| a (au) |
-1541.455781 |
| i (deg) |
65.538248 |
| Ω (om, deg) |
151.325339 |
| ω (w, deg) |
152.625329 |
| M (ma, deg) |
0.005931 |
等級
散乱 + 全体線形
$$
M_a = (7.425 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.425 |
| n |
6.000 |
| gf |
0.933 |
| gb |
-0.739 |
| k |
0.805 |
| δ90 |
4.778 |
| 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) |
| 2026-07-29 00:00 |
03:41:16.73 |
-44:27:34.4 |
HIP 17208 |
7.90 |
| 2026-07-29 12:00 |
03:41:21.83 |
-44:28:52.7 |
HIP 17208 |
6.81 |
| 2026-07-30 00:00 |
03:41:26.87 |
-44:30:11.3 |
HIP 17208 |
5.94 |
| 2026-07-30 12:00 |
03:41:31.83 |
-44:31:30.3 |
HIP 17208 |
5.40 |
| 2026-07-31 00:00 |
03:41:36.74 |
-44:32:49.6 |
HIP 17208 |
5.27 |
| 2026-07-31 12:00 |
03:41:41.57 |
-44:34:09.2 |
HIP 17208 |
5.60 |
| 2026-08-01 00:00 |
03:41:46.34 |
-44:35:29.2 |
HIP 17311 |
6.24 |
| 2026-08-01 12:00 |
03:41:51.05 |
-44:36:49.5 |
HIP 17311 |
5.91 |
| 2026-08-02 00:00 |
03:41:55.68 |
-44:38:10.1 |
HIP 17311 |
5.99 |
| 2026-08-02 12:00 |
03:42:00.25 |
-44:39:31.0 |
HIP 17311 |
6.49 |
| 2026-08-03 00:00 |
03:42:04.76 |
-44:40:52.3 |
HIP 17311 |
7.31 |
| 2026-08-03 12:00 |
03:42:09.19 |
-44:42:13.8 |
HIP 17311 |
8.35 |
| 2026-08-04 00:00 |
03:42:13.56 |
-44:43:35.7 |
HIP 17311 |
9.55 |
| 2026-08-04 12:00 |
03:42:17.86 |
-44:44:57.8 |
HIP 17311 |
10.85 |
| 2026-08-05 00:00 |
03:42:22.09 |
-44:46:20.3 |
HIP 17311 |
12.21 |
| 2026-08-05 12:00 |
03:42:26.25 |
-44:47:43.0 |
HIP 17311 |
13.63 |
| 2026-08-06 00:00 |
03:42:30.34 |
-44:49:06.0 |
HIP 17311 |
15.07 |
| 2026-08-06 12:00 |
03:42:34.36 |
-44:50:29.3 |
HIP 17311 |
16.54 |
| 2026-08-07 00:00 |
03:42:38.32 |
-44:51:52.9 |
HIP 17311 |
18.03 |
| 2026-08-07 12:00 |
03:42:42.20 |
-44:53:16.8 |
HIP 17311 |
19.53 |
| 2026-08-08 00:00 |
03:42:46.01 |
-44:54:40.9 |
HIP 17452 |
19.90 |
| 2026-08-08 12:00 |
03:42:49.75 |
-44:56:05.2 |
HIP 17452 |
19.95 |
| 2026-08-09 00:00 |
03:42:53.42 |
-44:57:29.8 |
HIP 17452 |
20.12 |
| 2026-08-09 12:00 |
03:42:57.02 |
-44:58:54.7 |
HIP 17452 |
20.43 |
| 2026-08-10 00:00 |
03:43:00.55 |
-45:00:19.8 |
HIP 17452 |
20.86 |
| 2026-08-10 12:00 |
03:43:04.01 |
-45:01:45.1 |
HIP 17452 |
21.41 |
| 2026-08-11 00:00 |
03:43:07.39 |
-45:03:10.7 |
HIP 17452 |
22.06 |
| 2026-08-11 12:00 |
03:43:10.70 |
-45:04:36.5 |
HIP 17452 |
22.81 |
| 2026-08-12 00:00 |
03:43:13.94 |
-45:06:02.5 |
HIP 17452 |
23.65 |
| 2026-08-12 12:00 |
03:43:17.10 |
-45:07:28.7 |
HIP 17452 |
24.57 |
| 2026-08-13 00:00 |
03:43:20.19 |
-45:08:55.1 |
HIP 17452 |
25.55 |
| 2026-08-13 12:00 |
03:43:23.21 |
-45:10:21.7 |
HIP 17452 |
26.60 |
| 2026-08-14 00:00 |
03:43:26.16 |
-45:11:48.5 |
HIP 17452 |
27.70 |
| 2026-08-14 12:00 |
03:43:29.03 |
-45:13:15.5 |
HIP 17452 |
28.85 |
| 2026-08-15 00:00 |
03:43:31.82 |
-45:14:42.6 |
HIP 17452 |
30.04 |
| 2026-08-15 12:00 |
03:43:34.54 |
-45:16:10.0 |
HIP 17452 |
31.27 |
| 2026-08-16 00:00 |
03:43:37.19 |
-45:17:37.4 |
HIP 17452 |
32.53 |
| 2026-08-16 12:00 |
03:43:39.77 |
-45:19:05.1 |
HIP 17160 |
33.66 |
| 2026-08-17 00:00 |
03:43:42.26 |
-45:20:32.9 |
HIP 17160 |
33.92 |
| 2026-08-17 12:00 |
03:43:44.69 |
-45:22:00.8 |
HIP 17160 |
34.23 |
| 2026-08-18 00:00 |
03:43:47.04 |
-45:23:28.9 |
HIP 17487 |
33.77 |
| 2026-08-18 12:00 |
03:43:49.31 |
-45:24:57.1 |
HIP 17487 |
32.25 |
| 2026-08-19 00:00 |
03:43:51.51 |
-45:26:25.4 |
HIP 17487 |
30.73 |