C/2019 K6 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
05:34:01.96 |
-14:51:58.1 |
HIP 26095 |
4.06 |
| 2026-02-03 12:00 |
05:33:55.20 |
-14:50:49.4 |
HIP 26095 |
2.54 |
| 2026-02-04 00:00 |
05:33:48.50 |
-14:49:40.4 |
HIP 26095 |
2.07 |
| 2026-02-04 12:00 |
05:33:41.87 |
-14:48:30.9 |
HIP 26095 |
3.15 |
| 2026-02-05 00:00 |
05:33:35.30 |
-14:47:21.1 |
HIP 26095 |
4.82 |
| 2026-02-05 12:00 |
05:33:28.80 |
-14:46:10.9 |
HIP 26095 |
6.64 |
| 2026-02-06 00:00 |
05:33:22.37 |
-14:45:00.3 |
HIP 26095 |
8.51 |
| 2026-02-06 12:00 |
05:33:16.00 |
-14:43:49.4 |
HIP 26095 |
10.40 |
| 2026-02-07 00:00 |
05:33:09.71 |
-14:42:38.1 |
HIP 26095 |
12.30 |
| 2026-02-07 12:00 |
05:33:03.48 |
-14:41:26.4 |
HIP 26095 |
14.19 |
| 2026-02-08 00:00 |
05:32:57.32 |
-14:40:14.4 |
HIP 26095 |
16.07 |
| 2026-02-08 12:00 |
05:32:51.23 |
-14:39:02.1 |
HIP 26095 |
17.96 |
| 2026-02-09 00:00 |
05:32:45.21 |
-14:37:49.4 |
HIP 26095 |
19.83 |
| 2026-02-09 12:00 |
05:32:39.25 |
-14:36:36.4 |
HIP 26095 |
21.70 |
| 2026-02-10 00:00 |
05:32:33.37 |
-14:35:23.1 |
HIP 26095 |
23.56 |
| 2026-02-10 12:00 |
05:32:27.56 |
-14:34:09.5 |
HIP 26095 |
25.41 |
| 2026-02-11 00:00 |
05:32:21.81 |
-14:32:55.5 |
HIP 26095 |
27.25 |
| 2026-02-11 12:00 |
05:32:16.14 |
-14:31:41.3 |
HIP 26095 |
29.08 |
| 2026-02-12 00:00 |
05:32:10.54 |
-14:30:26.7 |
HIP 26095 |
30.91 |
| 2026-02-12 12:00 |
05:32:05.01 |
-14:29:11.9 |
HIP 26095 |
32.72 |
| 2026-02-13 00:00 |
05:31:59.55 |
-14:27:56.8 |
HIP 25865 |
34.46 |
| 2026-02-13 12:00 |
05:31:54.16 |
-14:26:41.4 |
HIP 25865 |
35.33 |
| 2026-02-14 00:00 |
05:31:48.84 |
-14:25:25.7 |
HIP 25865 |
36.28 |
| 2026-02-14 12:00 |
05:31:43.60 |
-14:24:09.7 |
HIP 25865 |
37.30 |
| 2026-02-15 00:00 |
05:31:38.43 |
-14:22:53.5 |
HIP 25865 |
38.38 |
| 2026-02-15 12:00 |
05:31:33.33 |
-14:21:37.0 |
HIP 25829 |
38.83 |
| 2026-02-16 00:00 |
05:31:28.30 |
-14:20:20.3 |
HIP 25829 |
37.29 |
| 2026-02-16 12:00 |
05:31:23.34 |
-14:19:03.4 |
HIP 25829 |
35.77 |
| 2026-02-17 00:00 |
05:31:18.46 |
-14:17:46.2 |
HIP 25829 |
34.28 |
| 2026-02-17 12:00 |
05:31:13.65 |
-14:16:28.8 |
HIP 25829 |
32.81 |
| 2026-02-18 00:00 |
05:31:08.92 |
-14:15:11.1 |
HIP 25829 |
31.36 |
| 2026-02-18 12:00 |
05:31:04.26 |
-14:13:53.3 |
HIP 25829 |
29.95 |
| 2026-02-19 00:00 |
05:30:59.67 |
-14:12:35.2 |
HIP 25829 |
28.57 |
| 2026-02-19 12:00 |
05:30:55.15 |
-14:11:16.9 |
HIP 25829 |
27.22 |
| 2026-02-20 00:00 |
05:30:50.71 |
-14:09:58.5 |
HIP 25829 |
25.90 |
| 2026-02-20 12:00 |
05:30:46.34 |
-14:08:39.8 |
HIP 25829 |
24.63 |
| 2026-02-21 00:00 |
05:30:42.05 |
-14:07:21.0 |
HIP 25829 |
23.41 |
| 2026-02-21 12:00 |
05:30:37.83 |
-14:06:01.9 |
HIP 25829 |
22.25 |
| 2026-02-22 00:00 |
05:30:33.69 |
-14:04:42.8 |
HIP 25829 |
21.14 |
| 2026-02-22 12:00 |
05:30:29.62 |
-14:03:23.4 |
HIP 25829 |
20.10 |
| 2026-02-23 00:00 |
05:30:25.62 |
-14:02:03.9 |
HIP 25829 |
19.14 |
| 2026-02-23 12:00 |
05:30:21.70 |
-14:00:44.2 |
HIP 25829 |
18.26 |
| 2026-02-24 00:00 |
05:30:17.85 |
-13:59:24.4 |
HIP 25829 |
17.49 |