C/2025 R1 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2025 R1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-11-23T07:59:55.919040Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T15:42:44Z |
| Obs used |
335 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2025-09-03T13:15:15.955200Z |
| Discovery magnitude (MPC) |
19.35 c |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-10-02.0000000 |
| e |
0.98808015 |
| q (au) |
1.975212 |
| a (au) |
165.707761 |
| i (deg) |
110.027205 |
| Ω (om, deg) |
60.396227 |
| ω (w, deg) |
77.549154 |
| M (ma, deg) |
359.975819 |
等級
散乱 + 全体線形
$$
M_a = (14.152 + 5.771\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.152 |
| n |
5.771 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 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
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) |
| 2026-02-03 00:00 |
19:23:27.43 |
+22:34:28.1 |
HIP 95213 |
17.48 |
| 2026-02-03 12:00 |
19:23:36.62 |
+22:32:38.7 |
HIP 95213 |
19.46 |
| 2026-02-04 00:00 |
19:23:45.65 |
+22:30:52.5 |
HIP 95213 |
21.58 |
| 2026-02-04 12:00 |
19:23:54.50 |
+22:29:09.3 |
HIP 95428 |
20.26 |
| 2026-02-05 00:00 |
19:24:03.19 |
+22:27:29.3 |
HIP 95428 |
17.79 |
| 2026-02-05 12:00 |
19:24:11.70 |
+22:25:52.3 |
HIP 95428 |
15.43 |
| 2026-02-06 00:00 |
19:24:20.04 |
+22:24:18.3 |
HIP 95428 |
13.20 |
| 2026-02-06 12:00 |
19:24:28.21 |
+22:22:47.4 |
HIP 95428 |
11.14 |
| 2026-02-07 00:00 |
19:24:36.19 |
+22:21:19.4 |
HIP 95428 |
9.31 |
| 2026-02-07 12:00 |
19:24:44.00 |
+22:19:54.4 |
HIP 95428 |
7.82 |
| 2026-02-08 00:00 |
19:24:51.62 |
+22:18:32.4 |
HIP 95428 |
6.83 |
| 2026-02-08 12:00 |
19:24:59.06 |
+22:17:13.3 |
HIP 95462 |
4.84 |
| 2026-02-09 00:00 |
19:25:06.31 |
+22:15:57.1 |
HIP 95462 |
3.06 |
| 2026-02-09 12:00 |
19:25:13.38 |
+22:14:43.8 |
HIP 95462 |
2.07 |
| 2026-02-10 00:00 |
19:25:20.25 |
+22:13:33.4 |
HIP 95462 |
2.71 |
| 2026-02-10 12:00 |
19:25:26.93 |
+22:12:25.8 |
HIP 95462 |
4.22 |
| 2026-02-11 00:00 |
19:25:33.41 |
+22:11:21.0 |
HIP 95462 |
5.91 |
| 2026-02-11 12:00 |
19:25:39.70 |
+22:10:19.0 |
HIP 95462 |
7.61 |
| 2026-02-12 00:00 |
19:25:45.78 |
+22:09:19.8 |
HIP 95462 |
9.29 |
| 2026-02-12 12:00 |
19:25:51.66 |
+22:08:23.4 |
HIP 95462 |
10.91 |
| 2026-02-13 00:00 |
19:25:57.34 |
+22:07:29.7 |
HIP 95462 |
12.48 |
| 2026-02-13 12:00 |
19:26:02.81 |
+22:06:38.7 |
HIP 95462 |
13.99 |
| 2026-02-14 00:00 |
19:26:08.07 |
+22:05:50.4 |
HIP 95462 |
15.45 |
| 2026-02-14 12:00 |
19:26:13.11 |
+22:05:04.7 |
HIP 95462 |
16.83 |
| 2026-02-15 00:00 |
19:26:17.94 |
+22:04:21.7 |
HIP 95462 |
18.16 |
| 2026-02-15 12:00 |
19:26:22.55 |
+22:03:41.3 |
HIP 95462 |
19.42 |
| 2026-02-16 00:00 |
19:26:26.93 |
+22:03:03.5 |
HIP 95462 |
20.61 |
| 2026-02-16 12:00 |
19:26:31.10 |
+22:02:28.3 |
HIP 95462 |
21.74 |
| 2026-02-17 00:00 |
19:26:35.04 |
+22:01:55.6 |
HIP 95462 |
22.80 |
| 2026-02-17 12:00 |
19:26:38.75 |
+22:01:25.5 |
HIP 95608 |
22.28 |
| 2026-02-18 00:00 |
19:26:42.22 |
+22:00:57.9 |
HIP 95608 |
21.78 |
| 2026-02-18 12:00 |
19:26:45.47 |
+22:00:32.7 |
HIP 95608 |
21.36 |
| 2026-02-19 00:00 |
19:26:48.47 |
+22:00:10.0 |
HIP 95608 |
21.00 |
| 2026-02-19 12:00 |
19:26:51.23 |
+21:59:49.7 |
HIP 95608 |
20.70 |
| 2026-02-20 00:00 |
19:26:53.76 |
+21:59:31.9 |
HIP 95608 |
20.45 |
| 2026-02-20 12:00 |
19:26:56.03 |
+21:59:16.4 |
HIP 95608 |
20.26 |
| 2026-02-21 00:00 |
19:26:58.06 |
+21:59:03.3 |
HIP 95705 |
20.09 |
| 2026-02-21 12:00 |
19:26:59.84 |
+21:58:52.5 |
HIP 95705 |
19.67 |
| 2026-02-22 00:00 |
19:27:01.36 |
+21:58:44.0 |
HIP 95705 |
19.32 |
| 2026-02-22 12:00 |
19:27:02.62 |
+21:58:37.8 |
HIP 95705 |
19.04 |
| 2026-02-23 00:00 |
19:27:03.63 |
+21:58:33.9 |
HIP 95705 |
18.83 |
| 2026-02-23 12:00 |
19:27:04.37 |
+21:58:32.2 |
HIP 95705 |
18.68 |
| 2026-02-24 00:00 |
19:27:04.85 |
+21:58:32.7 |
HIP 95705 |
18.61 |