メタデータ
| 項目 |
値 |
| Designation |
C/2025 Q1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-07-12T01:27:00.011520Z |
| Orbit solution date (soln_date, UTC) |
2025-12-12T11:12:31Z |
| Obs used |
24 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
8.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-08-27T05:43:50.505600Z |
| Discovery magnitude (MPC) |
19.88 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) |
2025-01-29.0000000 |
| e |
0.99127748 |
| q (au) |
10.099968 |
| a (au) |
1157.918555 |
| i (deg) |
66.152955 |
| Ω (om, deg) |
326.964441 |
| ω (w, deg) |
280.236072 |
| M (ma, deg) |
0.005026 |
等級
散乱 + 全体線形
$$
M_a = (-1.316 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-1.316 |
| n |
6.000 |
| gf |
0.918 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.569 |
| 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 |
22:14:35.56 |
-63:21:56.4 |
HIP 109976 |
12.82 |
| 2026-06-01 12:00 |
22:14:31.65 |
-63:23:03.1 |
HIP 109976 |
13.43 |
| 2026-06-02 00:00 |
22:14:27.53 |
-63:24:09.9 |
HIP 109976 |
14.15 |
| 2026-06-02 12:00 |
22:14:23.21 |
-63:25:16.9 |
HIP 109976 |
14.94 |
| 2026-06-03 00:00 |
22:14:18.69 |
-63:26:24.1 |
HIP 109976 |
15.81 |
| 2026-06-03 12:00 |
22:14:13.96 |
-63:27:31.4 |
HIP 109976 |
16.75 |
| 2026-06-04 00:00 |
22:14:09.02 |
-63:28:38.8 |
HIP 109976 |
17.75 |
| 2026-06-04 12:00 |
22:14:03.88 |
-63:29:46.3 |
HIP 109976 |
18.80 |
| 2026-06-05 00:00 |
22:13:58.53 |
-63:30:54.0 |
HIP 109976 |
19.89 |
| 2026-06-05 12:00 |
22:13:52.97 |
-63:32:01.7 |
HIP 109485 |
20.62 |
| 2026-06-06 00:00 |
22:13:47.21 |
-63:33:09.5 |
HIP 109485 |
19.89 |
| 2026-06-06 12:00 |
22:13:41.24 |
-63:34:17.4 |
HIP 109485 |
19.19 |
| 2026-06-07 00:00 |
22:13:35.07 |
-63:35:25.4 |
HIP 109485 |
18.54 |
| 2026-06-07 12:00 |
22:13:28.68 |
-63:36:33.4 |
HIP 109485 |
17.94 |
| 2026-06-08 00:00 |
22:13:22.09 |
-63:37:41.4 |
HIP 109485 |
17.40 |
| 2026-06-08 12:00 |
22:13:15.29 |
-63:38:49.5 |
HIP 109485 |
16.94 |
| 2026-06-09 00:00 |
22:13:08.28 |
-63:39:57.6 |
HIP 109485 |
16.55 |
| 2026-06-09 12:00 |
22:13:01.07 |
-63:41:05.7 |
HIP 109485 |
16.25 |
| 2026-06-10 00:00 |
22:12:53.64 |
-63:42:13.7 |
HIP 109485 |
16.04 |
| 2026-06-10 12:00 |
22:12:46.01 |
-63:43:21.8 |
HIP 109485 |
15.94 |
| 2026-06-11 00:00 |
22:12:38.16 |
-63:44:29.8 |
HIP 109485 |
15.94 |
| 2026-06-11 12:00 |
22:12:30.11 |
-63:45:37.8 |
HIP 109485 |
16.06 |
| 2026-06-12 00:00 |
22:12:21.85 |
-63:46:45.6 |
HIP 109547 |
15.48 |
| 2026-06-12 12:00 |
22:12:13.38 |
-63:47:53.5 |
HIP 109547 |
14.07 |
| 2026-06-13 00:00 |
22:12:04.70 |
-63:49:01.2 |
HIP 109547 |
12.67 |
| 2026-06-13 12:00 |
22:11:55.82 |
-63:50:08.8 |
HIP 109547 |
11.28 |
| 2026-06-14 00:00 |
22:11:46.72 |
-63:51:16.3 |
HIP 109547 |
9.92 |
| 2026-06-14 12:00 |
22:11:37.41 |
-63:52:23.7 |
HIP 109547 |
8.60 |
| 2026-06-15 00:00 |
22:11:27.90 |
-63:53:30.9 |
HIP 109547 |
7.36 |
| 2026-06-15 12:00 |
22:11:18.18 |
-63:54:38.0 |
HIP 109547 |
6.26 |
| 2026-06-16 00:00 |
22:11:08.25 |
-63:55:44.9 |
HIP 109547 |
5.39 |
| 2026-06-16 12:00 |
22:10:58.12 |
-63:56:51.6 |
HIP 109547 |
4.89 |
| 2026-06-17 00:00 |
22:10:47.77 |
-63:57:58.1 |
HIP 109547 |
4.89 |
| 2026-06-17 12:00 |
22:10:37.22 |
-63:59:04.4 |
HIP 109547 |
5.40 |
| 2026-06-18 00:00 |
22:10:26.47 |
-64:00:10.4 |
HIP 109547 |
6.31 |
| 2026-06-18 12:00 |
22:10:15.50 |
-64:01:16.2 |
HIP 109547 |
7.49 |
| 2026-06-19 00:00 |
22:10:04.34 |
-64:02:21.8 |
HIP 109547 |
8.82 |
| 2026-06-19 12:00 |
22:09:52.97 |
-64:03:27.1 |
HIP 109547 |
10.27 |
| 2026-06-20 00:00 |
22:09:41.39 |
-64:04:32.1 |
HIP 109547 |
11.79 |
| 2026-06-20 12:00 |
22:09:29.62 |
-64:05:36.8 |
HIP 109328 |
12.78 |
| 2026-06-21 00:00 |
22:09:17.64 |
-64:06:41.1 |
HIP 109328 |
13.53 |
| 2026-06-21 12:00 |
22:09:05.46 |
-64:07:45.2 |
HIP 109359 |
12.78 |
| 2026-06-22 00:00 |
22:08:53.07 |
-64:08:48.9 |
HIP 109359 |
12.00 |