メタデータ
| 項目 |
値 |
| Designation |
C/2019 K5 (Young) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-22T18:02:04.787520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:56Z |
| Obs used |
734 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
9.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-05-25T14:10:08.054400Z |
| Discovery magnitude (MPC) |
17.10 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-09-13.0000000 |
| e |
0.98653488 |
| q (au) |
2.035047 |
| a (au) |
151.134694 |
| i (deg) |
15.315381 |
| Ω (om, deg) |
177.188411 |
| ω (w, deg) |
174.916616 |
| M (ma, deg) |
0.043630 |
等級
散乱 + 全体線形
$$
M_a = (11.210 + 4.027\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.210 |
| n |
4.027 |
| gf |
1.000 |
| gb |
-0.801 |
| k |
0.998 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
09:09:29.08 |
+06:05:28.0 |
HIP 45066 |
24.60 |
| 2026-09-20 12:00 |
09:09:33.87 |
+06:04:57.3 |
HIP 45066 |
24.04 |
| 2026-09-21 00:00 |
09:09:38.63 |
+06:04:26.7 |
HIP 45066 |
23.54 |
| 2026-09-21 12:00 |
09:09:43.35 |
+06:03:56.2 |
HIP 45066 |
23.11 |
| 2026-09-22 00:00 |
09:09:48.04 |
+06:03:25.7 |
HIP 45066 |
22.75 |
| 2026-09-22 12:00 |
09:09:52.70 |
+06:02:55.2 |
HIP 45066 |
22.45 |
| 2026-09-23 00:00 |
09:09:57.32 |
+06:02:24.8 |
HIP 45066 |
22.23 |
| 2026-09-23 12:00 |
09:10:01.91 |
+06:01:54.4 |
HIP 45066 |
22.08 |
| 2026-09-24 00:00 |
09:10:06.47 |
+06:01:24.1 |
HIP 45066 |
22.00 |
| 2026-09-24 12:00 |
09:10:11.00 |
+06:00:53.8 |
HIP 45066 |
22.00 |
| 2026-09-25 00:00 |
09:10:15.49 |
+06:00:23.6 |
HIP 45066 |
22.06 |
| 2026-09-25 12:00 |
09:10:19.94 |
+05:59:53.4 |
HIP 45066 |
22.20 |
| 2026-09-26 00:00 |
09:10:24.36 |
+05:59:23.3 |
HIP 45066 |
22.40 |
| 2026-09-26 12:00 |
09:10:28.75 |
+05:58:53.2 |
HIP 45066 |
22.67 |
| 2026-09-27 00:00 |
09:10:33.10 |
+05:58:23.2 |
HIP 45066 |
22.99 |
| 2026-09-27 12:00 |
09:10:37.42 |
+05:57:53.3 |
HIP 45066 |
23.37 |
| 2026-09-28 00:00 |
09:10:41.70 |
+05:57:23.4 |
HIP 45066 |
23.80 |
| 2026-09-28 12:00 |
09:10:45.94 |
+05:56:53.6 |
HIP 45066 |
24.28 |
| 2026-09-29 00:00 |
09:10:50.15 |
+05:56:23.8 |
HIP 45066 |
24.81 |
| 2026-09-29 12:00 |
09:10:54.32 |
+05:55:54.2 |
HIP 45066 |
25.37 |
| 2026-09-30 00:00 |
09:10:58.45 |
+05:55:24.6 |
HIP 45066 |
25.98 |
| 2026-09-30 12:00 |
09:11:02.55 |
+05:54:55.0 |
HIP 45066 |
26.61 |
| 2026-10-01 00:00 |
09:11:06.61 |
+05:54:25.6 |
HIP 45066 |
27.27 |
| 2026-10-01 12:00 |
09:11:10.64 |
+05:53:56.2 |
HIP 45066 |
27.96 |
| 2026-10-02 00:00 |
09:11:14.62 |
+05:53:26.9 |
HIP 45150 |
27.31 |
| 2026-10-02 12:00 |
09:11:18.57 |
+05:52:57.7 |
HIP 45150 |
26.50 |
| 2026-10-03 00:00 |
09:11:22.48 |
+05:52:28.6 |
HIP 45150 |
25.72 |
| 2026-10-03 12:00 |
09:11:26.35 |
+05:51:59.5 |
HIP 45150 |
24.96 |
| 2026-10-04 00:00 |
09:11:30.18 |
+05:51:30.5 |
HIP 45150 |
24.24 |
| 2026-10-04 12:00 |
09:11:33.98 |
+05:51:01.7 |
HIP 45150 |
23.54 |
| 2026-10-05 00:00 |
09:11:37.73 |
+05:50:32.9 |
HIP 45150 |
22.87 |
| 2026-10-05 12:00 |
09:11:41.44 |
+05:50:04.2 |
HIP 45150 |
22.23 |
| 2026-10-06 00:00 |
09:11:45.12 |
+05:49:35.6 |
HIP 45150 |
21.63 |
| 2026-10-06 12:00 |
09:11:48.75 |
+05:49:07.1 |
HIP 45150 |
21.07 |
| 2026-10-07 00:00 |
09:11:52.34 |
+05:48:38.7 |
HIP 45150 |
20.54 |
| 2026-10-07 12:00 |
09:11:55.90 |
+05:48:10.4 |
HIP 45150 |
20.05 |
| 2026-10-08 00:00 |
09:11:59.41 |
+05:47:42.2 |
HIP 45150 |
19.61 |
| 2026-10-08 12:00 |
09:12:02.88 |
+05:47:14.1 |
HIP 45150 |
19.20 |
| 2026-10-09 00:00 |
09:12:06.31 |
+05:46:46.1 |
HIP 45150 |
18.84 |
| 2026-10-09 12:00 |
09:12:09.69 |
+05:46:18.3 |
HIP 45252 |
18.39 |
| 2026-10-10 00:00 |
09:12:13.04 |
+05:45:50.5 |
HIP 45252 |
17.64 |
| 2026-10-10 12:00 |
09:12:16.34 |
+05:45:22.9 |
HIP 45252 |
16.93 |
| 2026-10-11 00:00 |
09:12:19.60 |
+05:44:55.4 |
HIP 45252 |
16.24 |