メタデータ
| 項目 |
値 |
| Designation |
P/2025 D4 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-02-14T06:47:27.813120Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:49Z |
| Obs used |
313 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
20.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-24T07:24:27.360000Z |
| Discovery magnitude (MPC) |
18.97 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-04-07.0000000 |
| e |
0.63433709 |
| q (au) |
3.254936 |
| a (au) |
8.901466 |
| i (deg) |
15.940781 |
| Ω (om, deg) |
233.119870 |
| ω (w, deg) |
332.889196 |
| M (ma, deg) |
1.919311 |
等級
散乱 + 全体線形
$$
M_a = (10.704 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.704 |
| n |
6.000 |
| gf |
0.950 |
| gb |
-0.645 |
| k |
0.800 |
| δ90 |
9.464 |
| 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) |
| 2026-06-01 00:00 |
19:21:07.46 |
-07:11:43.3 |
HIP 95228 |
20.26 |
| 2026-06-01 12:00 |
19:20:57.37 |
-07:10:21.8 |
HIP 95228 |
22.88 |
| 2026-06-02 00:00 |
19:20:47.11 |
-07:09:01.3 |
HIP 94955 |
22.69 |
| 2026-06-02 12:00 |
19:20:36.69 |
-07:07:41.7 |
HIP 94955 |
19.81 |
| 2026-06-03 00:00 |
19:20:26.10 |
-07:06:23.1 |
HIP 94955 |
16.91 |
| 2026-06-03 12:00 |
19:20:15.35 |
-07:05:05.5 |
HIP 94955 |
13.98 |
| 2026-06-04 00:00 |
19:20:04.45 |
-07:03:48.8 |
HIP 94955 |
11.04 |
| 2026-06-04 12:00 |
19:19:53.38 |
-07:02:33.2 |
HIP 94955 |
8.10 |
| 2026-06-05 00:00 |
19:19:42.16 |
-07:01:18.5 |
HIP 94955 |
5.20 |
| 2026-06-05 12:00 |
19:19:30.79 |
-07:00:04.8 |
HIP 94955 |
2.64 |
| 2026-06-06 00:00 |
19:19:19.26 |
-06:58:52.1 |
HIP 94955 |
2.41 |
| 2026-06-06 12:00 |
19:19:07.59 |
-06:57:40.5 |
HIP 94955 |
4.90 |
| 2026-06-07 00:00 |
19:18:55.76 |
-06:56:29.8 |
HIP 94955 |
7.89 |
| 2026-06-07 12:00 |
19:18:43.79 |
-06:55:20.2 |
HIP 94955 |
10.99 |
| 2026-06-08 00:00 |
19:18:31.67 |
-06:54:11.6 |
HIP 94955 |
14.16 |
| 2026-06-08 12:00 |
19:18:19.42 |
-06:53:04.0 |
HIP 94955 |
17.37 |
| 2026-06-09 00:00 |
19:18:07.02 |
-06:51:57.5 |
HIP 94955 |
20.61 |
| 2026-06-09 12:00 |
19:17:54.48 |
-06:50:52.0 |
HIP 94955 |
23.88 |
| 2026-06-10 00:00 |
19:17:41.81 |
-06:49:47.5 |
HIP 94955 |
27.19 |
| 2026-06-10 12:00 |
19:17:29.01 |
-06:48:44.1 |
HIP 94681 |
25.79 |
| 2026-06-11 00:00 |
19:17:16.07 |
-06:47:41.8 |
HIP 94681 |
23.59 |
| 2026-06-11 12:00 |
19:17:03.00 |
-06:46:40.5 |
HIP 94681 |
21.66 |
| 2026-06-12 00:00 |
19:16:49.81 |
-06:45:40.3 |
HIP 94681 |
20.09 |
| 2026-06-12 12:00 |
19:16:36.49 |
-06:44:41.1 |
HIP 94681 |
18.98 |
| 2026-06-13 00:00 |
19:16:23.05 |
-06:43:43.0 |
HIP 94681 |
18.43 |
| 2026-06-13 12:00 |
19:16:09.49 |
-06:42:46.0 |
HIP 94681 |
18.51 |
| 2026-06-14 00:00 |
19:15:55.82 |
-06:41:50.1 |
HIP 94681 |
19.21 |
| 2026-06-14 12:00 |
19:15:42.03 |
-06:40:55.3 |
HIP 94681 |
20.49 |
| 2026-06-15 00:00 |
19:15:28.13 |
-06:40:01.6 |
HIP 94605 |
21.40 |
| 2026-06-15 12:00 |
19:15:14.12 |
-06:39:08.9 |
HIP 94605 |
21.73 |
| 2026-06-16 00:00 |
19:15:00.00 |
-06:38:17.4 |
HIP 94605 |
22.61 |
| 2026-06-16 12:00 |
19:14:45.78 |
-06:37:26.9 |
HIP 94605 |
24.00 |
| 2026-06-17 00:00 |
19:14:31.46 |
-06:36:37.6 |
HIP 94605 |
25.81 |
| 2026-06-17 12:00 |
19:14:17.04 |
-06:35:49.3 |
HIP 94384 |
25.43 |
| 2026-06-18 00:00 |
19:14:02.53 |
-06:35:02.1 |
HIP 94384 |
21.77 |
| 2026-06-18 12:00 |
19:13:47.93 |
-06:34:16.1 |
HIP 94384 |
18.11 |
| 2026-06-19 00:00 |
19:13:33.23 |
-06:33:31.1 |
HIP 94384 |
14.46 |
| 2026-06-19 12:00 |
19:13:18.45 |
-06:32:47.3 |
HIP 94384 |
10.85 |
| 2026-06-20 00:00 |
19:13:03.59 |
-06:32:04.5 |
HIP 94384 |
7.37 |
| 2026-06-20 12:00 |
19:12:48.64 |
-06:31:22.9 |
HIP 94384 |
4.38 |
| 2026-06-21 00:00 |
19:12:33.62 |
-06:30:42.3 |
HIP 94384 |
3.58 |
| 2026-06-21 12:00 |
19:12:18.53 |
-06:30:02.9 |
HIP 94384 |
5.96 |
| 2026-06-22 00:00 |
19:12:03.36 |
-06:29:24.6 |
HIP 94384 |
9.36 |