メタデータ
| 項目 |
値 |
| Designation |
C/2025 R1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-11-23T08:02:53.695680Z |
| Orbit solution date (soln_date, UTC) |
2026-07-06T12:12:28Z |
| Obs used |
386 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
9.000 |
| 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) |
2025-11-01.0000000 |
| e |
0.98807918 |
| q (au) |
1.975205 |
| a (au) |
165.693617 |
| i (deg) |
110.027262 |
| Ω (om, deg) |
60.396310 |
| ω (w, deg) |
77.550236 |
| M (ma, deg) |
359.989679 |
等級
散乱 + 全体線形
$$
M_a = (13.843 + 5.035\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.843 |
| n |
5.035 |
| gf |
1.000 |
| gb |
-0.597 |
| 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) |
| 2026-09-20 00:00 |
15:30:40.14 |
-07:56:18.8 |
HIP 75906 |
9.31 |
| 2026-09-20 12:00 |
15:30:50.08 |
-08:01:15.3 |
HIP 75906 |
8.90 |
| 2026-09-21 00:00 |
15:31:00.16 |
-08:06:10.6 |
HIP 75906 |
11.55 |
| 2026-09-21 12:00 |
15:31:10.38 |
-08:11:04.7 |
HIP 75906 |
15.78 |
| 2026-09-22 00:00 |
15:31:20.73 |
-08:15:57.6 |
HIP 75906 |
20.64 |
| 2026-09-22 12:00 |
15:31:31.22 |
-08:20:49.2 |
HIP 76086 |
17.04 |
| 2026-09-23 00:00 |
15:31:41.84 |
-08:25:39.7 |
HIP 76086 |
12.04 |
| 2026-09-23 12:00 |
15:31:52.59 |
-08:30:29.0 |
HIP 76086 |
7.72 |
| 2026-09-24 00:00 |
15:32:03.47 |
-08:35:17.1 |
HIP 76086 |
5.87 |
| 2026-09-24 12:00 |
15:32:14.47 |
-08:40:04.0 |
HIP 76086 |
8.34 |
| 2026-09-25 00:00 |
15:32:25.60 |
-08:44:49.7 |
HIP 76086 |
12.83 |
| 2026-09-25 12:00 |
15:32:36.86 |
-08:49:34.3 |
HIP 76086 |
17.88 |
| 2026-09-26 00:00 |
15:32:48.24 |
-08:54:17.8 |
HIP 76086 |
23.13 |
| 2026-09-26 12:00 |
15:32:59.74 |
-08:59:00.1 |
HIP 76243 |
24.56 |
| 2026-09-27 00:00 |
15:33:11.36 |
-09:03:41.3 |
HIP 76243 |
19.94 |
| 2026-09-27 12:00 |
15:33:23.10 |
-09:08:21.3 |
HIP 76243 |
15.88 |
| 2026-09-28 00:00 |
15:33:34.95 |
-09:13:00.3 |
HIP 76243 |
12.89 |
| 2026-09-28 12:00 |
15:33:46.92 |
-09:17:38.1 |
HIP 76243 |
11.81 |
| 2026-09-29 00:00 |
15:33:59.01 |
-09:22:14.8 |
HIP 76243 |
13.14 |
| 2026-09-29 12:00 |
15:34:11.21 |
-09:26:50.4 |
HIP 76243 |
16.28 |
| 2026-09-30 00:00 |
15:34:23.52 |
-09:31:25.0 |
HIP 76288 |
18.93 |
| 2026-09-30 12:00 |
15:34:35.94 |
-09:35:58.4 |
HIP 76288 |
13.48 |
| 2026-10-01 00:00 |
15:34:48.47 |
-09:40:30.8 |
HIP 76288 |
8.09 |
| 2026-10-01 12:00 |
15:35:01.11 |
-09:45:02.1 |
HIP 76288 |
3.09 |
| 2026-10-02 00:00 |
15:35:13.85 |
-09:49:32.4 |
HIP 76288 |
3.75 |
| 2026-10-02 12:00 |
15:35:26.70 |
-09:54:01.6 |
HIP 76288 |
8.89 |
| 2026-10-03 00:00 |
15:35:39.66 |
-09:58:29.7 |
HIP 76288 |
14.30 |
| 2026-10-03 12:00 |
15:35:52.72 |
-10:02:56.9 |
HIP 76288 |
19.76 |
| 2026-10-04 00:00 |
15:36:05.88 |
-10:07:22.9 |
HIP 76467 |
25.02 |
| 2026-10-04 12:00 |
15:36:19.14 |
-10:11:48.0 |
HIP 76467 |
19.54 |
| 2026-10-05 00:00 |
15:36:32.50 |
-10:16:12.0 |
HIP 76467 |
14.09 |
| 2026-10-05 12:00 |
15:36:45.95 |
-10:20:35.1 |
HIP 76467 |
8.68 |
| 2026-10-06 00:00 |
15:36:59.51 |
-10:24:57.1 |
HIP 76467 |
3.55 |
| 2026-10-06 12:00 |
15:37:13.16 |
-10:29:18.1 |
HIP 76467 |
3.23 |
| 2026-10-07 00:00 |
15:37:26.90 |
-10:33:38.1 |
HIP 76467 |
8.29 |
| 2026-10-07 12:00 |
15:37:40.74 |
-10:37:57.1 |
HIP 76467 |
13.69 |
| 2026-10-08 00:00 |
15:37:54.67 |
-10:42:15.2 |
HIP 76467 |
19.15 |
| 2026-10-08 12:00 |
15:38:08.68 |
-10:46:32.2 |
HIP 76467 |
24.63 |
| 2026-10-09 00:00 |
15:38:22.79 |
-10:50:48.3 |
HIP 76467 |
30.12 |
| 2026-10-09 12:00 |
15:38:36.98 |
-10:55:03.4 |
HIP 76774 |
28.31 |
| 2026-10-10 00:00 |
15:38:51.26 |
-10:59:17.5 |
HIP 76774 |
25.50 |
| 2026-10-10 12:00 |
15:39:05.63 |
-11:03:30.7 |
HIP 76774 |
23.64 |
| 2026-10-11 00:00 |
15:39:20.08 |
-11:07:42.9 |
HIP 76774 |
22.95 |