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) |
| 2026-03-26 00:00 |
23:55:50.27 |
-07:14:48.3 |
HIP 118064 |
18.78 |
| 2026-03-26 12:00 |
23:55:57.86 |
-07:13:27.0 |
HIP 118064 |
17.58 |
| 2026-03-27 00:00 |
23:56:05.45 |
-07:12:05.9 |
HIP 118064 |
16.62 |
| 2026-03-27 12:00 |
23:56:13.03 |
-07:10:45.0 |
HIP 118064 |
15.95 |
| 2026-03-28 00:00 |
23:56:20.60 |
-07:09:24.2 |
HIP 118064 |
15.58 |
| 2026-03-28 12:00 |
23:56:28.16 |
-07:08:03.7 |
HIP 118064 |
15.56 |
| 2026-03-29 00:00 |
23:56:35.70 |
-07:06:43.3 |
HIP 118064 |
15.87 |
| 2026-03-29 12:00 |
23:56:43.24 |
-07:05:23.2 |
HIP 118064 |
16.49 |
| 2026-03-30 00:00 |
23:56:50.76 |
-07:04:03.2 |
HIP 118146 |
16.01 |
| 2026-03-30 12:00 |
23:56:58.27 |
-07:02:43.4 |
HIP 118146 |
14.36 |
| 2026-03-31 00:00 |
23:57:05.76 |
-07:01:23.8 |
HIP 118146 |
12.91 |
| 2026-03-31 12:00 |
23:57:13.24 |
-07:00:04.4 |
HIP 118146 |
11.72 |
| 2026-04-01 00:00 |
23:57:20.71 |
-06:58:45.3 |
HIP 118146 |
10.89 |
| 2026-04-01 12:00 |
23:57:28.16 |
-06:57:26.3 |
HIP 118146 |
10.50 |
| 2026-04-02 00:00 |
23:57:35.60 |
-06:56:07.5 |
HIP 118146 |
10.59 |
| 2026-04-02 12:00 |
23:57:43.03 |
-06:54:48.9 |
HIP 118146 |
11.15 |
| 2026-04-03 00:00 |
23:57:50.43 |
-06:53:30.6 |
HIP 118146 |
12.10 |
| 2026-04-03 12:00 |
23:57:57.83 |
-06:52:12.4 |
HIP 118146 |
13.37 |
| 2026-04-04 00:00 |
23:58:05.20 |
-06:50:54.5 |
HIP 118146 |
14.87 |
| 2026-04-04 12:00 |
23:58:12.56 |
-06:49:36.8 |
HIP 118146 |
16.53 |
| 2026-04-05 00:00 |
23:58:19.90 |
-06:48:19.3 |
HIP 118146 |
18.31 |
| 2026-04-05 12:00 |
23:58:27.23 |
-06:47:02.0 |
HIP 118146 |
20.18 |
| 2026-04-06 00:00 |
23:58:34.53 |
-06:45:44.9 |
HIP 118146 |
22.10 |
| 2026-04-06 12:00 |
23:58:41.82 |
-06:44:28.1 |
HIP 118146 |
24.08 |
| 2026-04-07 00:00 |
23:58:49.09 |
-06:43:11.5 |
HIP 118146 |
26.08 |
| 2026-04-07 12:00 |
23:58:56.34 |
-06:41:55.1 |
HIP 118146 |
28.12 |
| 2026-04-08 00:00 |
23:59:03.57 |
-06:40:38.9 |
HIP 118146 |
30.17 |
| 2026-04-08 12:00 |
23:59:10.78 |
-06:39:23.0 |
HIP 118146 |
32.23 |
| 2026-04-09 00:00 |
23:59:17.97 |
-06:38:07.3 |
HIP 118146 |
34.30 |
| 2026-04-09 12:00 |
23:59:25.14 |
-06:36:51.8 |
HIP 118146 |
36.38 |
| 2026-04-10 00:00 |
23:59:32.28 |
-06:35:36.6 |
HIP 118146 |
38.47 |
| 2026-04-10 12:00 |
23:59:39.41 |
-06:34:21.6 |
HIP 118146 |
40.56 |
| 2026-04-11 00:00 |
23:59:46.51 |
-06:33:06.8 |
HIP 118298 |
39.57 |
| 2026-04-11 12:00 |
23:59:53.59 |
-06:31:52.3 |
HIP 118298 |
38.43 |
| 2026-04-12 00:00 |
00:00:00.65 |
-06:30:38.1 |
HIP 118298 |
37.39 |
| 2026-04-12 12:00 |
00:00:07.68 |
-06:29:24.1 |
HIP 118298 |
36.45 |
| 2026-04-13 00:00 |
00:00:14.69 |
-06:28:10.3 |
HIP 118298 |
35.62 |
| 2026-04-13 12:00 |
00:00:21.68 |
-06:26:56.8 |
HIP 118298 |
34.90 |
| 2026-04-14 00:00 |
00:00:28.64 |
-06:25:43.6 |
HIP 154 |
33.29 |
| 2026-04-14 12:00 |
00:00:35.58 |
-06:24:30.6 |
HIP 154 |
31.24 |
| 2026-04-15 00:00 |
00:00:42.49 |
-06:23:17.9 |
HIP 154 |
29.20 |
| 2026-04-15 12:00 |
00:00:49.37 |
-06:22:05.4 |
HIP 154 |
27.19 |
| 2026-04-16 00:00 |
00:00:56.23 |
-06:20:53.2 |
HIP 154 |
25.19 |