メタデータ
| 項目 |
値 |
| Designation |
C/2025 O2 (MAPS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-05-23T16:42:19.152000Z |
| Orbit solution date (soln_date, UTC) |
2025-09-22T13:42:18Z |
| Obs used |
88 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
27.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-07-25T09:35:29.760000Z |
| Discovery magnitude (MPC) |
18.80 G |
| Discovery observatory (MPC) |
W94 · MAPS, San Pedro de Atacama |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-08-14.0000000 |
| e |
0.99886564 |
| q (au) |
2.288532 |
| a (au) |
2017.460252 |
| i (deg) |
134.542008 |
| Ω (om, deg) |
332.313059 |
| ω (w, deg) |
280.240987 |
| M (ma, deg) |
0.000895 |
等級
散乱 + 全体線形
$$
M_a = (11.254 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.254 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.504 |
| k |
1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
22:37:35.32 |
-03:12:42.7 |
HIP 111741 |
20.37 |
| 2026-05-12 12:00 |
22:37:28.58 |
-03:10:19.6 |
HIP 111741 |
18.97 |
| 2026-05-13 00:00 |
22:37:21.63 |
-03:07:57.2 |
HIP 111741 |
17.99 |
| 2026-05-13 12:00 |
22:37:14.47 |
-03:05:35.6 |
HIP 111741 |
17.50 |
| 2026-05-14 00:00 |
22:37:07.11 |
-03:03:14.7 |
HIP 111741 |
17.56 |
| 2026-05-14 12:00 |
22:36:59.53 |
-03:00:54.6 |
HIP 111741 |
18.17 |
| 2026-05-15 00:00 |
22:36:51.75 |
-02:58:35.3 |
HIP 111741 |
19.29 |
| 2026-05-15 12:00 |
22:36:43.75 |
-02:56:16.8 |
HIP 111741 |
20.84 |
| 2026-05-16 00:00 |
22:36:35.54 |
-02:53:59.1 |
HIP 111741 |
22.76 |
| 2026-05-16 12:00 |
22:36:27.12 |
-02:51:42.3 |
HIP 111741 |
24.96 |
| 2026-05-17 00:00 |
22:36:18.47 |
-02:49:26.2 |
HIP 111741 |
27.39 |
| 2026-05-17 12:00 |
22:36:09.62 |
-02:47:10.9 |
HIP 111741 |
30.00 |
| 2026-05-18 00:00 |
22:36:00.54 |
-02:44:56.5 |
HIP 111495 |
31.17 |
| 2026-05-18 12:00 |
22:35:51.24 |
-02:42:42.9 |
HIP 111495 |
28.35 |
| 2026-05-19 00:00 |
22:35:41.73 |
-02:40:30.1 |
HIP 111495 |
25.63 |
| 2026-05-19 12:00 |
22:35:31.99 |
-02:38:18.2 |
HIP 111495 |
23.05 |
| 2026-05-20 00:00 |
22:35:22.03 |
-02:36:07.1 |
HIP 111495 |
20.69 |
| 2026-05-20 12:00 |
22:35:11.84 |
-02:33:56.8 |
HIP 111495 |
18.63 |
| 2026-05-21 00:00 |
22:35:01.44 |
-02:31:47.5 |
HIP 111495 |
17.02 |
| 2026-05-21 12:00 |
22:34:50.80 |
-02:29:38.9 |
HIP 111495 |
16.01 |
| 2026-05-22 00:00 |
22:34:39.94 |
-02:27:31.3 |
HIP 111495 |
15.74 |
| 2026-05-22 12:00 |
22:34:28.86 |
-02:25:24.5 |
HIP 111495 |
16.27 |
| 2026-05-23 00:00 |
22:34:17.54 |
-02:23:18.6 |
HIP 111495 |
17.55 |
| 2026-05-23 12:00 |
22:34:06.00 |
-02:21:13.6 |
HIP 111495 |
19.45 |
| 2026-05-24 00:00 |
22:33:54.23 |
-02:19:09.5 |
HIP 111495 |
21.83 |
| 2026-05-24 12:00 |
22:33:42.23 |
-02:17:06.2 |
HIP 111495 |
24.56 |
| 2026-05-25 00:00 |
22:33:29.99 |
-02:15:03.9 |
HIP 111495 |
27.56 |
| 2026-05-25 12:00 |
22:33:17.53 |
-02:13:02.4 |
HIP 111495 |
30.77 |
| 2026-05-26 00:00 |
22:33:04.83 |
-02:11:01.9 |
HIP 111495 |
34.13 |
| 2026-05-26 12:00 |
22:32:51.90 |
-02:09:02.3 |
HIP 111495 |
37.63 |
| 2026-05-27 00:00 |
22:32:38.73 |
-02:07:03.6 |
HIP 111394 |
38.80 |
| 2026-05-27 12:00 |
22:32:25.33 |
-02:05:05.8 |
HIP 111394 |
39.16 |
| 2026-05-28 00:00 |
22:32:11.69 |
-02:03:08.9 |
HIP 111394 |
39.94 |
| 2026-05-28 12:00 |
22:31:57.82 |
-02:01:13.0 |
HIP 111394 |
41.15 |
| 2026-05-29 00:00 |
22:31:43.71 |
-01:59:18.0 |
HIP 111394 |
42.74 |
| 2026-05-29 12:00 |
22:31:29.36 |
-01:57:24.0 |
HIP 111394 |
44.70 |
| 2026-05-30 00:00 |
22:31:14.78 |
-01:55:30.9 |
HIP 111394 |
46.99 |
| 2026-05-30 12:00 |
22:30:59.95 |
-01:53:38.7 |
HIP 110955 |
45.69 |
| 2026-05-31 00:00 |
22:30:44.88 |
-01:51:47.6 |
HIP 110955 |
44.42 |
| 2026-05-31 12:00 |
22:30:29.58 |
-01:49:57.3 |
HIP 110955 |
43.48 |
| 2026-06-01 00:00 |
22:30:14.03 |
-01:48:08.1 |
HIP 110955 |
42.89 |
| 2026-06-01 12:00 |
22:29:58.24 |
-01:46:19.9 |
HIP 110848 |
38.79 |
| 2026-06-02 00:00 |
22:29:42.20 |
-01:44:32.6 |
HIP 110848 |
34.51 |