メタデータ
| 項目 |
値 |
| Designation |
C/2024 N4 (Sarneczky) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-01-09T23:14:49.182720Z |
| Orbit solution date (soln_date, UTC) |
2026-03-21T13:42:22Z |
| Obs used |
469 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
11.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-07-14T23:03:55.584000Z |
| Discovery magnitude (MPC) |
19.00 R |
| Discovery observatory (MPC) |
K88 · GINOP-KHK, Piszkéstető |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-01-10.0000000 |
| e |
1.00454035 |
| q (au) |
5.397605 |
| a (au) |
-1188.808944 |
| i (deg) |
49.771300 |
| Ω (om, deg) |
339.662444 |
| ω (w, deg) |
116.676997 |
| M (ma, deg) |
0.000001 |
等級
散乱 + 全体線形
$$
M_a = (3.053 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.053 |
| n |
6.000 |
| gf |
0.979 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
9.929 |
| 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 |
10:17:10.27 |
+17:37:06.4 |
HIP 50305 |
14.84 |
| 2026-07-29 12:00 |
10:17:26.48 |
+17:33:56.0 |
HIP 50469 |
15.95 |
| 2026-07-30 00:00 |
10:17:42.72 |
+17:30:45.7 |
HIP 50469 |
10.95 |
| 2026-07-30 12:00 |
10:17:58.98 |
+17:27:35.4 |
HIP 50469 |
5.94 |
| 2026-07-31 00:00 |
10:18:15.27 |
+17:24:25.3 |
HIP 50469 |
0.93 |
| 2026-07-31 12:00 |
10:18:31.57 |
+17:21:15.3 |
HIP 50469 |
4.09 |
| 2026-08-01 00:00 |
10:18:47.90 |
+17:18:05.3 |
HIP 50469 |
9.11 |
| 2026-08-01 12:00 |
10:19:04.25 |
+17:14:55.5 |
HIP 50469 |
14.14 |
| 2026-08-02 00:00 |
10:19:20.61 |
+17:11:45.7 |
HIP 50549 |
14.67 |
| 2026-08-02 12:00 |
10:19:37.00 |
+17:08:36.0 |
HIP 50549 |
11.51 |
| 2026-08-03 00:00 |
10:19:53.40 |
+17:05:26.4 |
HIP 50549 |
10.02 |
| 2026-08-03 12:00 |
10:20:09.83 |
+17:02:17.0 |
HIP 50549 |
10.91 |
| 2026-08-04 00:00 |
10:20:26.27 |
+16:59:07.6 |
HIP 50549 |
13.74 |
| 2026-08-04 12:00 |
10:20:42.73 |
+16:55:58.3 |
HIP 50549 |
17.59 |
| 2026-08-05 00:00 |
10:20:59.20 |
+16:52:49.1 |
HIP 50549 |
21.94 |
| 2026-08-05 12:00 |
10:21:15.69 |
+16:49:40.0 |
HIP 50819 |
19.64 |
| 2026-08-06 00:00 |
10:21:32.20 |
+16:46:31.0 |
HIP 50819 |
15.14 |
| 2026-08-06 12:00 |
10:21:48.72 |
+16:43:22.1 |
HIP 50819 |
11.10 |
| 2026-08-07 00:00 |
10:22:05.26 |
+16:40:13.3 |
HIP 50819 |
8.27 |
| 2026-08-07 12:00 |
10:22:21.81 |
+16:37:04.6 |
HIP 50819 |
8.04 |
| 2026-08-08 00:00 |
10:22:38.37 |
+16:33:56.1 |
HIP 50784 |
8.88 |
| 2026-08-08 12:00 |
10:22:54.94 |
+16:30:47.6 |
HIP 50784 |
11.06 |
| 2026-08-09 00:00 |
10:23:11.53 |
+16:27:39.2 |
HIP 50784 |
14.74 |
| 2026-08-09 12:00 |
10:23:28.13 |
+16:24:31.0 |
HIP 50784 |
19.07 |
| 2026-08-10 00:00 |
10:23:44.74 |
+16:21:22.8 |
HIP 50784 |
23.70 |
| 2026-08-10 12:00 |
10:24:01.36 |
+16:18:14.8 |
HIP 50784 |
28.48 |
| 2026-08-11 00:00 |
10:24:17.99 |
+16:15:06.9 |
HIP 50784 |
33.35 |
| 2026-08-11 12:00 |
10:24:34.62 |
+16:11:59.1 |
HIP 50784 |
38.27 |
| 2026-08-12 00:00 |
10:24:51.27 |
+16:08:51.4 |
HIP 51221 |
43.11 |
| 2026-08-12 12:00 |
10:25:07.92 |
+16:05:43.9 |
HIP 51201 |
38.89 |
| 2026-08-13 00:00 |
10:25:24.58 |
+16:02:36.5 |
HIP 51201 |
33.88 |
| 2026-08-13 12:00 |
10:25:41.24 |
+15:59:29.2 |
HIP 51201 |
28.89 |
| 2026-08-14 00:00 |
10:25:57.91 |
+15:56:22.0 |
HIP 51201 |
23.93 |
| 2026-08-14 12:00 |
10:26:14.59 |
+15:53:15.0 |
HIP 51201 |
19.04 |
| 2026-08-15 00:00 |
10:26:31.27 |
+15:50:08.1 |
HIP 51201 |
14.27 |
| 2026-08-15 12:00 |
10:26:47.95 |
+15:47:01.3 |
HIP 51201 |
9.82 |
| 2026-08-16 00:00 |
10:27:04.63 |
+15:43:54.7 |
HIP 51201 |
6.38 |
| 2026-08-16 12:00 |
10:27:21.32 |
+15:40:48.2 |
HIP 51201 |
6.04 |
| 2026-08-17 00:00 |
10:27:38.01 |
+15:37:41.9 |
HIP 51201 |
9.15 |
| 2026-08-17 12:00 |
10:27:54.70 |
+15:34:35.7 |
HIP 51279 |
13.19 |
| 2026-08-18 00:00 |
10:28:11.39 |
+15:31:29.6 |
HIP 51279 |
14.32 |
| 2026-08-18 12:00 |
10:28:28.07 |
+15:28:23.7 |
HIP 51279 |
16.96 |
| 2026-08-19 00:00 |
10:28:44.76 |
+15:25:18.0 |
HIP 51279 |
20.53 |