メタデータ
| 項目 |
値 |
| Designation |
C/2024 J2 (Wierzchos) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-03-19T18:36:17.582400Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
451 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-05-11T06:26:33.302400Z |
| Discovery magnitude (MPC) |
21.29 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-02-11.0000000 |
| e |
0.98760800 |
| q (au) |
1.810945 |
| a (au) |
146.138176 |
| i (deg) |
79.296967 |
| Ω (om, deg) |
189.059198 |
| ω (w, deg) |
143.153599 |
| M (ma, deg) |
359.979483 |
等級
散乱 + 全体線形
$$
M_a = (12.357 + 4.798\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.357 |
| n |
4.798 |
| gf |
0.989 |
| gb |
-0.712 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2024-03-12 |
2024-11-30 |
+3.8463 |
-1.845 |
| 2024-11-30 |
2025-02-05 |
-14.5398 |
+4.355 |
| 2025-06-26 |
2025-11-28 |
-5.8285 |
+2.402 |
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 |
02:55:38.53 |
-40:22:10.2 |
HIP 13566 |
18.64 |
| 2026-03-26 12:00 |
02:56:11.87 |
-40:20:12.1 |
HIP 13566 |
21.42 |
| 2026-03-27 00:00 |
02:56:45.27 |
-40:18:15.4 |
HIP 13847 |
17.24 |
| 2026-03-27 12:00 |
02:57:18.73 |
-40:16:19.9 |
HIP 13847 |
11.04 |
| 2026-03-28 00:00 |
02:57:52.25 |
-40:14:25.6 |
HIP 13847 |
5.91 |
| 2026-03-28 12:00 |
02:58:25.84 |
-40:12:32.7 |
HIP 13847 |
6.06 |
| 2026-03-29 00:00 |
02:58:59.48 |
-40:10:41.0 |
HIP 13847 |
11.29 |
| 2026-03-29 12:00 |
02:59:33.18 |
-40:08:50.6 |
HIP 13885 |
17.51 |
| 2026-03-30 00:00 |
03:00:06.94 |
-40:07:01.4 |
HIP 13885 |
20.20 |
| 2026-03-30 12:00 |
03:00:40.76 |
-40:05:13.6 |
HIP 14158 |
23.60 |
| 2026-03-31 00:00 |
03:01:14.63 |
-40:03:27.0 |
HIP 14158 |
18.86 |
| 2026-03-31 12:00 |
03:01:48.56 |
-40:01:41.8 |
HIP 14158 |
15.61 |
| 2026-04-01 00:00 |
03:02:22.54 |
-39:59:57.8 |
HIP 14158 |
14.88 |
| 2026-04-01 12:00 |
03:02:56.58 |
-39:58:15.1 |
HIP 14271 |
14.56 |
| 2026-04-02 00:00 |
03:03:30.68 |
-39:56:33.8 |
HIP 14271 |
11.29 |
| 2026-04-02 12:00 |
03:04:04.82 |
-39:54:53.7 |
HIP 14338 |
9.56 |
| 2026-04-03 00:00 |
03:04:39.02 |
-39:53:14.9 |
HIP 14338 |
2.82 |
| 2026-04-03 12:00 |
03:05:13.27 |
-39:51:37.5 |
HIP 14372 |
3.09 |
| 2026-04-04 00:00 |
03:05:47.57 |
-39:50:01.4 |
HIP 14372 |
4.58 |
| 2026-04-04 12:00 |
03:06:21.92 |
-39:48:26.6 |
HIP 14457 |
2.79 |
| 2026-04-05 00:00 |
03:06:56.32 |
-39:46:53.1 |
HIP 14457 |
4.35 |
| 2026-04-05 12:00 |
03:07:30.77 |
-39:45:20.9 |
HIP 14457 |
11.07 |
| 2026-04-06 00:00 |
03:08:05.27 |
-39:43:50.1 |
HIP 14628 |
12.03 |
| 2026-04-06 12:00 |
03:08:39.81 |
-39:42:20.6 |
HIP 14628 |
6.28 |
| 2026-04-07 00:00 |
03:09:14.41 |
-39:40:52.5 |
HIP 14628 |
5.23 |
| 2026-04-07 12:00 |
03:09:49.04 |
-39:39:25.7 |
HIP 14628 |
10.42 |
| 2026-04-08 00:00 |
03:10:23.73 |
-39:38:00.2 |
HIP 14628 |
16.83 |
| 2026-04-08 12:00 |
03:10:58.46 |
-39:36:36.1 |
HIP 14868 |
18.57 |
| 2026-04-09 00:00 |
03:11:33.24 |
-39:35:13.4 |
HIP 14868 |
14.08 |
| 2026-04-09 12:00 |
03:12:08.06 |
-39:33:52.0 |
HIP 14868 |
12.08 |
| 2026-04-10 00:00 |
03:12:42.92 |
-39:32:32.0 |
HIP 14868 |
13.73 |
| 2026-04-10 12:00 |
03:13:17.83 |
-39:31:13.3 |
HIP 14868 |
18.05 |
| 2026-04-11 00:00 |
03:13:52.78 |
-39:29:56.1 |
HIP 14868 |
23.62 |
| 2026-04-11 12:00 |
03:14:27.77 |
-39:28:40.2 |
HIP 15162 |
20.49 |
| 2026-04-12 00:00 |
03:15:02.80 |
-39:27:25.7 |
HIP 15162 |
18.87 |
| 2026-04-12 12:00 |
03:15:37.87 |
-39:26:12.6 |
HIP 15162 |
19.63 |
| 2026-04-13 00:00 |
03:16:12.98 |
-39:25:01.0 |
HIP 15185 |
21.96 |
| 2026-04-13 12:00 |
03:16:48.13 |
-39:23:50.7 |
HIP 15185 |
23.60 |
| 2026-04-14 00:00 |
03:17:23.31 |
-39:22:41.8 |
HIP 15324 |
25.20 |
| 2026-04-14 12:00 |
03:17:58.54 |
-39:21:34.3 |
HIP 15324 |
24.11 |
| 2026-04-15 00:00 |
03:18:33.80 |
-39:20:28.3 |
HIP 15324 |
25.00 |
| 2026-04-15 12:00 |
03:19:09.10 |
-39:19:23.7 |
HIP 15324 |
27.67 |
| 2026-04-16 00:00 |
03:19:44.43 |
-39:18:20.5 |
HIP 15324 |
31.68 |