メタデータ
| 項目 |
値 |
| Designation |
C/2025 D6 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-12-11T08:17:56.722560Z |
| Orbit solution date (soln_date, UTC) |
2025-10-28T16:12:42Z |
| Obs used |
144 |
| NEO |
- |
| M1 |
12.600 |
| K1 |
10.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-26T06:35:48.595200Z |
| Discovery magnitude (MPC) |
18.48 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) |
2025-03-22.0000000 |
| e |
0.99797059 |
| q (au) |
2.503681 |
| a (au) |
1233.700697 |
| i (deg) |
145.789062 |
| Ω (om, deg) |
151.490101 |
| ω (w, deg) |
285.394018 |
| M (ma, deg) |
0.002289 |
等級
散乱 + 全体線形
$$
M_a = (12.398 + 4.428\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.398 |
| n |
4.428 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.943 |
| δ90 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
09:19:23.26 |
+30:58:38.6 |
HIP 45573 |
27.10 |
| 2026-09-20 12:00 |
09:19:32.14 |
+30:59:35.8 |
HIP 45573 |
28.84 |
| 2026-09-21 00:00 |
09:19:40.93 |
+31:00:33.7 |
HIP 45573 |
30.60 |
| 2026-09-21 12:00 |
09:19:49.63 |
+31:01:32.4 |
HIP 45573 |
32.38 |
| 2026-09-22 00:00 |
09:19:58.23 |
+31:02:32.0 |
HIP 45573 |
34.18 |
| 2026-09-22 12:00 |
09:20:06.75 |
+31:03:32.4 |
HIP 45573 |
35.99 |
| 2026-09-23 00:00 |
09:20:15.17 |
+31:04:33.6 |
HIP 45573 |
37.81 |
| 2026-09-23 12:00 |
09:20:23.50 |
+31:05:35.7 |
HIP 45573 |
39.64 |
| 2026-09-24 00:00 |
09:20:31.74 |
+31:06:38.5 |
HIP 45584 |
41.08 |
| 2026-09-24 12:00 |
09:20:39.87 |
+31:07:42.3 |
HIP 45584 |
42.48 |
| 2026-09-25 00:00 |
09:20:47.92 |
+31:08:46.8 |
HIP 45584 |
43.91 |
| 2026-09-25 12:00 |
09:20:55.86 |
+31:09:52.3 |
HIP 45584 |
45.35 |
| 2026-09-26 00:00 |
09:21:03.71 |
+31:10:58.5 |
HIP 45584 |
46.82 |
| 2026-09-26 12:00 |
09:21:11.46 |
+31:12:05.7 |
HIP 45584 |
48.30 |
| 2026-09-27 00:00 |
09:21:19.11 |
+31:13:13.6 |
HIP 45584 |
49.80 |
| 2026-09-27 12:00 |
09:21:26.65 |
+31:14:22.5 |
HIP 46135 |
49.77 |
| 2026-09-28 00:00 |
09:21:34.10 |
+31:15:32.2 |
HIP 46135 |
49.26 |
| 2026-09-28 12:00 |
09:21:41.44 |
+31:16:42.8 |
HIP 46135 |
48.84 |
| 2026-09-29 00:00 |
09:21:48.68 |
+31:17:54.2 |
HIP 46135 |
48.54 |
| 2026-09-29 12:00 |
09:21:55.82 |
+31:19:06.6 |
HIP 46135 |
48.33 |
| 2026-09-30 00:00 |
09:22:02.85 |
+31:20:19.8 |
HIP 46135 |
48.23 |
| 2026-09-30 12:00 |
09:22:09.78 |
+31:21:33.9 |
HIP 46135 |
48.23 |
| 2026-10-01 00:00 |
09:22:16.59 |
+31:22:48.9 |
HIP 46135 |
48.34 |
| 2026-10-01 12:00 |
09:22:23.30 |
+31:24:04.8 |
HIP 46135 |
48.54 |
| 2026-10-02 00:00 |
09:22:29.90 |
+31:25:21.6 |
HIP 46135 |
48.85 |
| 2026-10-02 12:00 |
09:22:36.39 |
+31:26:39.2 |
HIP 46135 |
49.25 |
| 2026-10-03 00:00 |
09:22:42.77 |
+31:27:57.8 |
HIP 46174 |
48.56 |
| 2026-10-03 12:00 |
09:22:49.04 |
+31:29:17.4 |
HIP 46174 |
46.71 |
| 2026-10-04 00:00 |
09:22:55.19 |
+31:30:37.8 |
HIP 46174 |
44.85 |
| 2026-10-04 12:00 |
09:23:01.23 |
+31:31:59.1 |
HIP 46174 |
43.01 |
| 2026-10-05 00:00 |
09:23:07.16 |
+31:33:21.4 |
HIP 46174 |
41.16 |
| 2026-10-05 12:00 |
09:23:12.96 |
+31:34:44.6 |
HIP 46174 |
39.32 |
| 2026-10-06 00:00 |
09:23:18.65 |
+31:36:08.7 |
HIP 46174 |
37.48 |
| 2026-10-06 12:00 |
09:23:24.22 |
+31:37:33.8 |
HIP 46174 |
35.64 |
| 2026-10-07 00:00 |
09:23:29.67 |
+31:38:59.8 |
HIP 46174 |
33.81 |
| 2026-10-07 12:00 |
09:23:35.00 |
+31:40:26.7 |
HIP 46174 |
31.98 |
| 2026-10-08 00:00 |
09:23:40.21 |
+31:41:54.6 |
HIP 46174 |
30.14 |
| 2026-10-08 12:00 |
09:23:45.30 |
+31:43:23.4 |
HIP 46174 |
28.31 |
| 2026-10-09 00:00 |
09:23:50.26 |
+31:44:53.2 |
HIP 46174 |
26.49 |
| 2026-10-09 12:00 |
09:23:55.09 |
+31:46:24.0 |
HIP 46174 |
24.66 |
| 2026-10-10 00:00 |
09:23:59.80 |
+31:47:55.7 |
HIP 46174 |
22.83 |
| 2026-10-10 12:00 |
09:24:04.38 |
+31:49:28.3 |
HIP 46174 |
21.01 |
| 2026-10-11 00:00 |
09:24:08.84 |
+31:51:02.0 |
HIP 46174 |
19.18 |