メタデータ
| 項目 |
値 |
| Designation |
C/2025 Y1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-10-14T01:32:10.317120Z |
| Orbit solution date (soln_date, UTC) |
2026-06-05T03:03:20Z |
| Obs used |
1149 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
9.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2025-12-26T13:40:40.656000Z |
| Discovery magnitude (MPC) |
18.75 o |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2026-03-17.0000000 |
| e |
0.99951705 |
| q (au) |
2.601867 |
| a (au) |
5387.443685 |
| i (deg) |
14.557145 |
| Ω (om, deg) |
166.552143 |
| ω (w, deg) |
124.299971 |
| M (ma, deg) |
359.998564 |
等級
散乱 + 全体線形
$$
M_a = (5.787 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.787 |
| n |
6.000 |
| gf |
0.951 |
| gb |
-0.793 |
| k |
0.800 |
| δ90 |
9.972 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
12:40:10.10 |
+04:40:44.4 |
HIP 61745 |
25.53 |
| 2026-06-01 12:00 |
12:40:07.06 |
+04:40:55.8 |
HIP 61745 |
24.98 |
| 2026-06-02 00:00 |
12:40:04.18 |
+04:41:05.9 |
HIP 61745 |
24.47 |
| 2026-06-02 12:00 |
12:40:01.46 |
+04:41:14.8 |
HIP 61745 |
24.02 |
| 2026-06-03 00:00 |
12:39:58.91 |
+04:41:22.5 |
HIP 61745 |
23.61 |
| 2026-06-03 12:00 |
12:39:56.51 |
+04:41:29.0 |
HIP 61745 |
23.25 |
| 2026-06-04 00:00 |
12:39:54.28 |
+04:41:34.2 |
HIP 61745 |
22.94 |
| 2026-06-04 12:00 |
12:39:52.21 |
+04:41:38.2 |
HIP 61745 |
22.67 |
| 2026-06-05 00:00 |
12:39:50.30 |
+04:41:41.0 |
HIP 61745 |
22.44 |
| 2026-06-05 12:00 |
12:39:48.56 |
+04:41:42.6 |
HIP 61745 |
22.25 |
| 2026-06-06 00:00 |
12:39:46.98 |
+04:41:42.9 |
HIP 61745 |
22.11 |
| 2026-06-06 12:00 |
12:39:45.56 |
+04:41:42.1 |
HIP 61745 |
22.00 |
| 2026-06-07 00:00 |
12:39:44.31 |
+04:41:40.0 |
HIP 61745 |
21.93 |
| 2026-06-07 12:00 |
12:39:43.22 |
+04:41:36.6 |
HIP 61745 |
21.90 |
| 2026-06-08 00:00 |
12:39:42.30 |
+04:41:32.1 |
HIP 61745 |
21.90 |
| 2026-06-08 12:00 |
12:39:41.55 |
+04:41:26.4 |
HIP 61745 |
21.94 |
| 2026-06-09 00:00 |
12:39:40.96 |
+04:41:19.4 |
HIP 61745 |
22.01 |
| 2026-06-09 12:00 |
12:39:40.54 |
+04:41:11.2 |
HIP 61745 |
22.11 |
| 2026-06-10 00:00 |
12:39:40.28 |
+04:41:01.8 |
HIP 61745 |
22.24 |
| 2026-06-10 12:00 |
12:39:40.19 |
+04:40:51.2 |
HIP 61745 |
22.41 |
| 2026-06-11 00:00 |
12:39:40.27 |
+04:40:39.4 |
HIP 61745 |
22.60 |
| 2026-06-11 12:00 |
12:39:40.52 |
+04:40:26.4 |
HIP 61745 |
22.83 |
| 2026-06-12 00:00 |
12:39:40.93 |
+04:40:12.2 |
HIP 61745 |
23.08 |
| 2026-06-12 12:00 |
12:39:41.51 |
+04:39:56.8 |
HIP 61745 |
23.37 |
| 2026-06-13 00:00 |
12:39:42.27 |
+04:39:40.2 |
HIP 61745 |
23.69 |
| 2026-06-13 12:00 |
12:39:43.18 |
+04:39:22.4 |
HIP 61745 |
24.04 |
| 2026-06-14 00:00 |
12:39:44.27 |
+04:39:03.4 |
HIP 61745 |
24.42 |
| 2026-06-14 12:00 |
12:39:45.53 |
+04:38:43.2 |
HIP 61745 |
24.83 |
| 2026-06-15 00:00 |
12:39:46.95 |
+04:38:21.9 |
HIP 61745 |
25.28 |
| 2026-06-15 12:00 |
12:39:48.55 |
+04:37:59.3 |
HIP 61745 |
25.76 |
| 2026-06-16 00:00 |
12:39:50.31 |
+04:37:35.6 |
HIP 61745 |
26.27 |
| 2026-06-16 12:00 |
12:39:52.25 |
+04:37:10.7 |
HIP 61745 |
26.82 |
| 2026-06-17 00:00 |
12:39:54.35 |
+04:36:44.6 |
HIP 61745 |
27.41 |
| 2026-06-17 12:00 |
12:39:56.62 |
+04:36:17.4 |
HIP 61745 |
28.03 |
| 2026-06-18 00:00 |
12:39:59.06 |
+04:35:49.0 |
HIP 61745 |
28.70 |
| 2026-06-18 12:00 |
12:40:01.67 |
+04:35:19.5 |
HIP 61745 |
29.40 |
| 2026-06-19 00:00 |
12:40:04.45 |
+04:34:48.8 |
HIP 61745 |
30.14 |
| 2026-06-19 12:00 |
12:40:07.40 |
+04:34:16.9 |
HIP 61745 |
30.92 |
| 2026-06-20 00:00 |
12:40:10.51 |
+04:33:44.0 |
HIP 61745 |
31.75 |
| 2026-06-20 12:00 |
12:40:13.80 |
+04:33:09.9 |
HIP 61745 |
32.61 |
| 2026-06-21 00:00 |
12:40:17.25 |
+04:32:34.6 |
HIP 61991 |
33.25 |
| 2026-06-21 12:00 |
12:40:20.87 |
+04:31:58.3 |
HIP 61991 |
32.17 |
| 2026-06-22 00:00 |
12:40:24.66 |
+04:31:20.8 |
HIP 61991 |
31.04 |