P/2025 D4 (ATLAS)
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
$$
M_a = (10.708 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.708 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.645 |
| k |
0.800 |
| δ90 |
9.994 |
| 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) |
| 2026-02-03 00:00 |
18:28:54.43 |
-15:14:49.4 |
HIP 90459 |
21.44 |
| 2026-02-03 12:00 |
18:29:27.15 |
-15:13:11.4 |
HIP 90459 |
29.42 |
| 2026-02-04 00:00 |
18:29:59.76 |
-15:11:32.8 |
HIP 90834 |
26.69 |
| 2026-02-04 12:00 |
18:30:32.26 |
-15:09:53.5 |
HIP 90834 |
18.88 |
| 2026-02-05 00:00 |
18:31:04.66 |
-15:08:13.6 |
HIP 90834 |
11.37 |
| 2026-02-05 12:00 |
18:31:36.94 |
-15:06:33.1 |
HIP 90834 |
5.47 |
| 2026-02-06 00:00 |
18:32:09.11 |
-15:04:51.9 |
HIP 90834 |
7.59 |
| 2026-02-06 12:00 |
18:32:41.17 |
-15:03:10.1 |
HIP 90913 |
11.24 |
| 2026-02-07 00:00 |
18:33:13.12 |
-15:01:27.7 |
HIP 90913 |
11.94 |
| 2026-02-07 12:00 |
18:33:44.95 |
-14:59:44.6 |
HIP 90991 |
8.65 |
| 2026-02-08 00:00 |
18:34:16.66 |
-14:58:00.9 |
HIP 90991 |
11.36 |
| 2026-02-08 12:00 |
18:34:48.27 |
-14:56:16.7 |
HIP 90991 |
17.48 |
| 2026-02-09 00:00 |
18:35:19.75 |
-14:54:31.8 |
HIP 91068 |
23.30 |
| 2026-02-09 12:00 |
18:35:51.12 |
-14:52:46.3 |
HIP 91280 |
20.78 |
| 2026-02-10 00:00 |
18:36:22.37 |
-14:51:00.2 |
HIP 91280 |
15.46 |
| 2026-02-10 12:00 |
18:36:53.50 |
-14:49:13.5 |
HIP 91280 |
12.91 |
| 2026-02-11 00:00 |
18:37:24.51 |
-14:47:26.2 |
HIP 91280 |
14.62 |
| 2026-02-11 12:00 |
18:37:55.40 |
-14:45:38.3 |
HIP 91280 |
19.48 |
| 2026-02-12 00:00 |
18:38:26.17 |
-14:43:49.8 |
HIP 91430 |
15.16 |
| 2026-02-12 12:00 |
18:38:56.82 |
-14:42:00.8 |
HIP 91430 |
13.00 |
| 2026-02-13 00:00 |
18:39:27.34 |
-14:40:11.1 |
HIP 91430 |
14.97 |
| 2026-02-13 12:00 |
18:39:57.74 |
-14:38:20.9 |
HIP 91623 |
18.54 |
| 2026-02-14 00:00 |
18:40:28.02 |
-14:36:30.2 |
HIP 91623 |
13.26 |
| 2026-02-14 12:00 |
18:40:58.17 |
-14:34:38.8 |
HIP 91677 |
10.75 |
| 2026-02-15 00:00 |
18:41:28.19 |
-14:32:46.9 |
HIP 91677 |
3.62 |
| 2026-02-15 12:00 |
18:41:58.08 |
-14:30:54.5 |
HIP 91677 |
4.79 |
| 2026-02-16 00:00 |
18:42:27.85 |
-14:29:01.5 |
HIP 91677 |
12.00 |
| 2026-02-16 12:00 |
18:42:57.48 |
-14:27:07.9 |
HIP 91677 |
19.36 |
| 2026-02-17 00:00 |
18:43:26.99 |
-14:25:13.8 |
HIP 91982 |
21.13 |
| 2026-02-17 12:00 |
18:43:56.36 |
-14:23:19.2 |
HIP 91982 |
13.79 |
| 2026-02-18 00:00 |
18:44:25.60 |
-14:21:24.1 |
HIP 91982 |
6.55 |
| 2026-02-18 12:00 |
18:44:54.71 |
-14:19:28.4 |
HIP 91982 |
1.79 |
| 2026-02-19 00:00 |
18:45:23.68 |
-14:17:32.2 |
HIP 91982 |
8.36 |
| 2026-02-19 12:00 |
18:45:52.52 |
-14:15:35.5 |
HIP 91982 |
15.55 |
| 2026-02-20 00:00 |
18:46:21.22 |
-14:13:38.2 |
HIP 92140 |
15.49 |
| 2026-02-20 12:00 |
18:46:49.79 |
-14:11:40.5 |
HIP 92140 |
16.23 |
| 2026-02-21 00:00 |
18:47:18.22 |
-14:09:42.3 |
HIP 92140 |
19.75 |
| 2026-02-21 12:00 |
18:47:46.51 |
-14:07:43.6 |
HIP 92323 |
22.20 |
| 2026-02-22 00:00 |
18:48:14.66 |
-14:05:44.4 |
HIP 92323 |
15.77 |
| 2026-02-22 12:00 |
18:48:42.67 |
-14:03:44.7 |
HIP 92323 |
10.28 |
| 2026-02-23 00:00 |
18:49:10.54 |
-14:01:44.5 |
HIP 92323 |
7.92 |
| 2026-02-23 12:00 |
18:49:38.27 |
-13:59:43.9 |
HIP 92323 |
10.89 |
| 2026-02-24 00:00 |
18:50:05.86 |
-13:57:42.8 |
HIP 92323 |
16.49 |