メタデータ
| 項目 |
値 |
| Designation |
C/2024 Y1 (Masek) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-11-26T20:36:13.553280Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T09:13:00Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
17.800 |
| K1 |
17.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-12-25T01:50:03.552000Z |
| Discovery magnitude (MPC) |
15.30 V |
| Discovery observatory (MPC) |
I47 · Pierre Auger Observatory, Malargüe |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-12-31.0000000 |
| e |
0.98668110 |
| q (au) |
0.822345 |
| a (au) |
61.742672 |
| i (deg) |
64.749901 |
| Ω (om, deg) |
112.545653 |
| ω (w, deg) |
238.138955 |
| M (ma, deg) |
0.069360 |
等級
散乱 + 全体線形
$$
M_a = (15.657 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.657 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-07-29 00:00 |
08:31:33.72 |
+34:36:15.6 |
HIP 41931 |
21.20 |
| 2026-07-29 12:00 |
08:31:52.88 |
+34:35:59.0 |
HIP 41931 |
18.08 |
| 2026-07-30 00:00 |
08:32:12.03 |
+34:35:42.7 |
HIP 41931 |
15.35 |
| 2026-07-30 12:00 |
08:32:31.15 |
+34:35:26.7 |
HIP 41931 |
13.26 |
| 2026-07-31 00:00 |
08:32:50.25 |
+34:35:11.1 |
HIP 41931 |
12.14 |
| 2026-07-31 12:00 |
08:33:09.33 |
+34:34:55.8 |
HIP 41931 |
12.26 |
| 2026-08-01 00:00 |
08:33:28.39 |
+34:34:40.8 |
HIP 41931 |
13.58 |
| 2026-08-01 12:00 |
08:33:47.43 |
+34:34:26.2 |
HIP 41931 |
15.79 |
| 2026-08-02 00:00 |
08:34:06.44 |
+34:34:11.9 |
HIP 41931 |
18.58 |
| 2026-08-02 12:00 |
08:34:25.44 |
+34:33:58.0 |
HIP 41931 |
21.72 |
| 2026-08-03 00:00 |
08:34:44.40 |
+34:33:44.4 |
HIP 41931 |
25.08 |
| 2026-08-03 12:00 |
08:35:03.34 |
+34:33:31.2 |
HIP 42230 |
25.05 |
| 2026-08-04 00:00 |
08:35:22.26 |
+34:33:18.3 |
HIP 42230 |
22.34 |
| 2026-08-04 12:00 |
08:35:41.15 |
+34:33:05.8 |
HIP 42230 |
20.02 |
| 2026-08-05 00:00 |
08:36:00.02 |
+34:32:53.7 |
HIP 42230 |
18.24 |
| 2026-08-05 12:00 |
08:36:18.85 |
+34:32:41.9 |
HIP 42230 |
17.16 |
| 2026-08-06 00:00 |
08:36:37.66 |
+34:32:30.5 |
HIP 42230 |
16.92 |
| 2026-08-06 12:00 |
08:36:56.44 |
+34:32:19.4 |
HIP 42230 |
17.55 |
| 2026-08-07 00:00 |
08:37:15.19 |
+34:32:08.7 |
HIP 42386 |
16.75 |
| 2026-08-07 12:00 |
08:37:33.92 |
+34:31:58.4 |
HIP 42386 |
12.93 |
| 2026-08-08 00:00 |
08:37:52.61 |
+34:31:48.5 |
HIP 42386 |
9.15 |
| 2026-08-08 12:00 |
08:38:11.27 |
+34:31:39.0 |
HIP 42386 |
5.50 |
| 2026-08-09 00:00 |
08:38:29.90 |
+34:31:29.9 |
HIP 42386 |
2.50 |
| 2026-08-09 12:00 |
08:38:48.49 |
+34:31:21.2 |
HIP 42386 |
3.43 |
| 2026-08-10 00:00 |
08:39:07.06 |
+34:31:12.8 |
HIP 42386 |
6.83 |
| 2026-08-10 12:00 |
08:39:25.59 |
+34:31:04.9 |
HIP 42386 |
10.52 |
| 2026-08-11 00:00 |
08:39:44.08 |
+34:30:57.4 |
HIP 42386 |
14.27 |
| 2026-08-11 12:00 |
08:40:02.54 |
+34:30:50.3 |
HIP 42386 |
18.04 |
| 2026-08-12 00:00 |
08:40:20.96 |
+34:30:43.6 |
HIP 42583 |
19.12 |
| 2026-08-12 12:00 |
08:40:39.35 |
+34:30:37.3 |
HIP 42583 |
18.64 |
| 2026-08-13 00:00 |
08:40:57.69 |
+34:30:31.5 |
HIP 42583 |
18.91 |
| 2026-08-13 12:00 |
08:41:16.00 |
+34:30:26.1 |
HIP 42583 |
19.90 |
| 2026-08-14 00:00 |
08:41:34.27 |
+34:30:21.1 |
HIP 42583 |
21.50 |
| 2026-08-14 12:00 |
08:41:52.50 |
+34:30:16.5 |
HIP 42734 |
20.55 |
| 2026-08-15 00:00 |
08:42:10.69 |
+34:30:12.4 |
HIP 42734 |
19.35 |
| 2026-08-15 12:00 |
08:42:28.84 |
+34:30:08.7 |
HIP 42734 |
18.85 |
| 2026-08-16 00:00 |
08:42:46.94 |
+34:30:05.5 |
HIP 42734 |
19.08 |
| 2026-08-16 12:00 |
08:43:05.01 |
+34:30:02.7 |
HIP 42734 |
20.03 |
| 2026-08-17 00:00 |
08:43:23.02 |
+34:30:00.4 |
HIP 42734 |
21.59 |
| 2026-08-17 12:00 |
08:43:41.00 |
+34:29:58.5 |
HIP 42734 |
23.63 |
| 2026-08-18 00:00 |
08:43:58.93 |
+34:29:57.1 |
HIP 42987 |
21.80 |
| 2026-08-18 12:00 |
08:44:16.81 |
+34:29:56.1 |
HIP 42987 |
18.23 |
| 2026-08-19 00:00 |
08:44:34.65 |
+34:29:55.7 |
HIP 42987 |
14.75 |