メタデータ
| 項目 |
値 |
| Designation |
C/2019 K6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-05-20T00:32:38.981760Z |
| Orbit solution date (soln_date, UTC) |
2022-01-05T13:06:41Z |
| Obs used |
360 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
11.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-05-31T13:20:54.816000Z |
| Discovery magnitude (MPC) |
21.10 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-08-12.0000000 |
| e |
0.99756459 |
| q (au) |
3.928974 |
| a (au) |
1613.267974 |
| i (deg) |
132.394317 |
| Ω (om, deg) |
42.926027 |
| ω (w, deg) |
187.578586 |
| M (ma, deg) |
359.995710 |
等級
散乱 + 全体線形
$$
M_a = (6.462 + 5.788\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.462 |
| n |
5.788 |
| gf |
1.000 |
| gb |
-0.502 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2019-05-07 |
2020-05-14 |
+1.2378 |
-0.912 |
| 2020-05-21 |
2021-03-13 |
+7.1303 |
-3.375 |
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 |
05:28:40.07 |
-12:38:43.7 |
HIP 25634 |
3.42 |
| 2026-03-26 12:00 |
05:28:40.57 |
-12:37:25.5 |
HIP 25634 |
2.65 |
| 2026-03-27 00:00 |
05:28:41.14 |
-12:36:07.5 |
HIP 25634 |
2.41 |
| 2026-03-27 12:00 |
05:28:41.78 |
-12:34:49.7 |
HIP 25634 |
2.85 |
| 2026-03-28 00:00 |
05:28:42.48 |
-12:33:32.1 |
HIP 25634 |
3.73 |
| 2026-03-28 12:00 |
05:28:43.24 |
-12:32:14.6 |
HIP 25634 |
4.81 |
| 2026-03-29 00:00 |
05:28:44.07 |
-12:30:57.4 |
HIP 25634 |
5.99 |
| 2026-03-29 12:00 |
05:28:44.96 |
-12:29:40.4 |
HIP 25634 |
7.21 |
| 2026-03-30 00:00 |
05:28:45.92 |
-12:28:23.5 |
HIP 25634 |
8.46 |
| 2026-03-30 12:00 |
05:28:46.94 |
-12:27:06.9 |
HIP 25634 |
9.73 |
| 2026-03-31 00:00 |
05:28:48.02 |
-12:25:50.5 |
HIP 25634 |
11.01 |
| 2026-03-31 12:00 |
05:28:49.16 |
-12:24:34.4 |
HIP 25634 |
12.29 |
| 2026-04-01 00:00 |
05:28:50.37 |
-12:23:18.4 |
HIP 25634 |
13.58 |
| 2026-04-01 12:00 |
05:28:51.63 |
-12:22:02.7 |
HIP 25634 |
14.87 |
| 2026-04-02 00:00 |
05:28:52.96 |
-12:20:47.2 |
HIP 25634 |
16.17 |
| 2026-04-02 12:00 |
05:28:54.35 |
-12:19:32.0 |
HIP 25634 |
17.46 |
| 2026-04-03 00:00 |
05:28:55.80 |
-12:18:16.9 |
HIP 25634 |
18.76 |
| 2026-04-03 12:00 |
05:28:57.31 |
-12:17:02.2 |
HIP 25634 |
20.06 |
| 2026-04-04 00:00 |
05:28:58.88 |
-12:15:47.6 |
HIP 25634 |
21.36 |
| 2026-04-04 12:00 |
05:29:00.51 |
-12:14:33.4 |
HIP 25634 |
22.66 |
| 2026-04-05 00:00 |
05:29:02.20 |
-12:13:19.3 |
HIP 25634 |
23.96 |
| 2026-04-05 12:00 |
05:29:03.95 |
-12:12:05.6 |
HIP 25634 |
25.26 |
| 2026-04-06 00:00 |
05:29:05.76 |
-12:10:52.1 |
HIP 25634 |
26.57 |
| 2026-04-06 12:00 |
05:29:07.63 |
-12:09:38.8 |
HIP 25634 |
27.87 |
| 2026-04-07 00:00 |
05:29:09.55 |
-12:08:25.8 |
HIP 25634 |
29.17 |
| 2026-04-07 12:00 |
05:29:11.53 |
-12:07:13.1 |
HIP 25634 |
30.47 |
| 2026-04-08 00:00 |
05:29:13.57 |
-12:06:00.7 |
HIP 25634 |
31.78 |
| 2026-04-08 12:00 |
05:29:15.67 |
-12:04:48.5 |
HIP 25634 |
33.08 |
| 2026-04-09 00:00 |
05:29:17.83 |
-12:03:36.7 |
HIP 25486 |
33.92 |
| 2026-04-09 12:00 |
05:29:20.04 |
-12:02:25.1 |
HIP 25486 |
34.13 |
| 2026-04-10 00:00 |
05:29:22.31 |
-12:01:13.8 |
HIP 25486 |
34.40 |
| 2026-04-10 12:00 |
05:29:24.63 |
-12:00:02.7 |
HIP 25486 |
34.73 |
| 2026-04-11 00:00 |
05:29:27.01 |
-11:58:52.0 |
HIP 25765 |
33.90 |
| 2026-04-11 12:00 |
05:29:29.44 |
-11:57:41.6 |
HIP 25765 |
32.60 |
| 2026-04-12 00:00 |
05:29:31.93 |
-11:56:31.5 |
HIP 25765 |
31.31 |
| 2026-04-12 12:00 |
05:29:34.48 |
-11:55:21.7 |
HIP 25765 |
30.02 |
| 2026-04-13 00:00 |
05:29:37.08 |
-11:54:12.2 |
HIP 25765 |
28.74 |
| 2026-04-13 12:00 |
05:29:39.73 |
-11:53:03.0 |
HIP 25765 |
27.46 |
| 2026-04-14 00:00 |
05:29:42.44 |
-11:51:54.1 |
HIP 25765 |
26.19 |
| 2026-04-14 12:00 |
05:29:45.20 |
-11:50:45.6 |
HIP 25765 |
24.92 |
| 2026-04-15 00:00 |
05:29:48.01 |
-11:49:37.3 |
HIP 25765 |
23.67 |
| 2026-04-15 12:00 |
05:29:50.88 |
-11:48:29.4 |
HIP 25765 |
22.43 |
| 2026-04-16 00:00 |
05:29:53.79 |
-11:47:21.9 |
HIP 25765 |
21.20 |