メタデータ
| 項目 |
値 |
| Designation |
C/2019 B3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-01-20T04:27:17.818560Z |
| Orbit solution date (soln_date, UTC) |
2024-05-14T12:42:17Z |
| Obs used |
293 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
8.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-01-24T13:55:58.656000Z |
| Discovery magnitude (MPC) |
19.60 i |
| 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) |
2021-06-17.0000000 |
| e |
1.00210415 |
| q (au) |
6.823022 |
| a (au) |
-3242.642558 |
| i (deg) |
66.536192 |
| Ω (om, deg) |
358.432372 |
| ω (w, deg) |
263.923054 |
| M (ma, deg) |
0.000789 |
等級
散乱 + 全体線形
$$
M_a = (3.014 + 4.873\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.014 |
| n |
4.873 |
| gf |
0.908 |
| gb |
-0.607 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2019-01-24 |
2020-11-22 |
+7.1898 |
-6.267 |
| 2021-01-29 |
2022-11-05 |
-12.7160 |
+10.938 |
| 2022-11-05 |
2023-10-18 |
+29.4532 |
-27.381 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
00:06:06.21 |
-05:25:09.4 |
HIP 443 |
20.76 |
| 2026-05-12 12:00 |
00:06:11.10 |
-05:24:13.7 |
HIP 443 |
22.21 |
| 2026-05-13 00:00 |
00:06:15.95 |
-05:23:18.4 |
HIP 637 |
23.60 |
| 2026-05-13 12:00 |
00:06:20.75 |
-05:22:23.5 |
HIP 637 |
22.70 |
| 2026-05-14 00:00 |
00:06:25.50 |
-05:21:28.9 |
HIP 637 |
21.88 |
| 2026-05-14 12:00 |
00:06:30.20 |
-05:20:34.7 |
HIP 637 |
21.13 |
| 2026-05-15 00:00 |
00:06:34.86 |
-05:19:40.8 |
HIP 637 |
20.48 |
| 2026-05-15 12:00 |
00:06:39.46 |
-05:18:47.3 |
HIP 637 |
19.92 |
| 2026-05-16 00:00 |
00:06:44.02 |
-05:17:54.2 |
HIP 637 |
19.46 |
| 2026-05-16 12:00 |
00:06:48.53 |
-05:17:01.4 |
HIP 637 |
19.10 |
| 2026-05-17 00:00 |
00:06:52.99 |
-05:16:09.0 |
HIP 637 |
18.85 |
| 2026-05-17 12:00 |
00:06:57.40 |
-05:15:17.0 |
HIP 637 |
18.71 |
| 2026-05-18 00:00 |
00:07:01.75 |
-05:14:25.3 |
HIP 637 |
18.67 |
| 2026-05-18 12:00 |
00:07:06.06 |
-05:13:34.1 |
HIP 637 |
18.74 |
| 2026-05-19 00:00 |
00:07:10.32 |
-05:12:43.1 |
HIP 637 |
18.90 |
| 2026-05-19 12:00 |
00:07:14.52 |
-05:11:52.6 |
HIP 637 |
19.17 |
| 2026-05-20 00:00 |
00:07:18.67 |
-05:11:02.5 |
HIP 637 |
19.52 |
| 2026-05-20 12:00 |
00:07:22.78 |
-05:10:12.7 |
HIP 637 |
19.95 |
| 2026-05-21 00:00 |
00:07:26.82 |
-05:09:23.3 |
HIP 642 |
19.24 |
| 2026-05-21 12:00 |
00:07:30.82 |
-05:08:34.2 |
HIP 642 |
18.15 |
| 2026-05-22 00:00 |
00:07:34.76 |
-05:07:45.6 |
HIP 642 |
17.09 |
| 2026-05-22 12:00 |
00:07:38.65 |
-05:06:57.3 |
HIP 642 |
16.07 |
| 2026-05-23 00:00 |
00:07:42.49 |
-05:06:09.4 |
HIP 642 |
15.10 |
| 2026-05-23 12:00 |
00:07:46.27 |
-05:05:21.9 |
HIP 642 |
14.18 |
| 2026-05-24 00:00 |
00:07:50.00 |
-05:04:34.8 |
HIP 642 |
13.31 |
| 2026-05-24 12:00 |
00:07:53.68 |
-05:03:48.1 |
HIP 642 |
12.51 |
| 2026-05-25 00:00 |
00:07:57.30 |
-05:03:01.7 |
HIP 642 |
11.78 |
| 2026-05-25 12:00 |
00:08:00.87 |
-05:02:15.8 |
HIP 642 |
11.14 |
| 2026-05-26 00:00 |
00:08:04.38 |
-05:01:30.2 |
HIP 642 |
10.59 |
| 2026-05-26 12:00 |
00:08:07.83 |
-05:00:45.0 |
HIP 642 |
10.14 |
| 2026-05-27 00:00 |
00:08:11.24 |
-05:00:00.2 |
HIP 642 |
9.81 |
| 2026-05-27 12:00 |
00:08:14.58 |
-04:59:15.7 |
HIP 642 |
9.60 |
| 2026-05-28 00:00 |
00:08:17.87 |
-04:58:31.7 |
HIP 642 |
9.51 |
| 2026-05-28 12:00 |
00:08:21.10 |
-04:57:48.0 |
HIP 642 |
9.54 |
| 2026-05-29 00:00 |
00:08:24.28 |
-04:57:04.8 |
HIP 642 |
9.68 |
| 2026-05-29 12:00 |
00:08:27.40 |
-04:56:21.9 |
HIP 642 |
9.93 |
| 2026-05-30 00:00 |
00:08:30.47 |
-04:55:39.4 |
HIP 642 |
10.28 |
| 2026-05-30 12:00 |
00:08:33.47 |
-04:54:57.3 |
HIP 642 |
10.70 |
| 2026-05-31 00:00 |
00:08:36.42 |
-04:54:15.6 |
HIP 642 |
11.19 |
| 2026-05-31 12:00 |
00:08:39.31 |
-04:53:34.3 |
HIP 642 |
11.73 |
| 2026-06-01 00:00 |
00:08:42.15 |
-04:52:53.4 |
HIP 642 |
12.32 |
| 2026-06-01 12:00 |
00:08:44.93 |
-04:52:12.9 |
HIP 642 |
12.94 |
| 2026-06-02 00:00 |
00:08:47.64 |
-04:51:32.8 |
HIP 642 |
13.59 |