メタデータ
| 項目 |
値 |
| Designation |
427P/ATLAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-07-28T00:34:23.257920Z |
| Orbit solution date (soln_date, UTC) |
2021-10-08T07:06:18Z |
| Obs used |
434 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
19.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-06-09T01:43:41.059200Z |
| Discovery magnitude (MPC) |
24.00 G |
| Discovery observatory (MPC) |
I11 · Gemini South Observatory, Cerro Pachon |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-11-23.0000000 |
| e |
0.31304498 |
| q (au) |
2.178224 |
| a (au) |
3.170840 |
| i (deg) |
11.849372 |
| Ω (om, deg) |
252.391001 |
| ω (w, deg) |
99.944337 |
| M (ma, deg) |
20.593814 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 3.940\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
3.940 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.840 |
| 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) |
| 2026-06-01 00:00 |
11:12:03.39 |
-07:42:07.3 |
HIP 54791 |
30.18 |
| 2026-06-01 12:00 |
11:12:11.24 |
-07:41:10.3 |
HIP 54791 |
28.44 |
| 2026-06-02 00:00 |
11:12:19.30 |
-07:40:14.9 |
HIP 54791 |
26.77 |
| 2026-06-02 12:00 |
11:12:27.56 |
-07:39:21.0 |
HIP 54791 |
25.19 |
| 2026-06-03 00:00 |
11:12:36.03 |
-07:38:28.7 |
HIP 54791 |
23.73 |
| 2026-06-03 12:00 |
11:12:44.71 |
-07:37:37.9 |
HIP 54791 |
22.41 |
| 2026-06-04 00:00 |
11:12:53.58 |
-07:36:48.7 |
HIP 54791 |
21.29 |
| 2026-06-04 12:00 |
11:13:02.66 |
-07:36:01.0 |
HIP 54791 |
20.41 |
| 2026-06-05 00:00 |
11:13:11.94 |
-07:35:14.9 |
HIP 54791 |
19.80 |
| 2026-06-05 12:00 |
11:13:21.42 |
-07:34:30.3 |
HIP 54791 |
19.52 |
| 2026-06-06 00:00 |
11:13:31.10 |
-07:33:47.2 |
HIP 54791 |
19.59 |
| 2026-06-06 12:00 |
11:13:40.97 |
-07:33:05.7 |
HIP 54791 |
20.02 |
| 2026-06-07 00:00 |
11:13:51.05 |
-07:32:25.7 |
HIP 54791 |
20.81 |
| 2026-06-07 12:00 |
11:14:01.32 |
-07:31:47.2 |
HIP 54791 |
21.93 |
| 2026-06-08 00:00 |
11:14:11.78 |
-07:31:10.3 |
HIP 54791 |
23.34 |
| 2026-06-08 12:00 |
11:14:22.44 |
-07:30:34.9 |
HIP 54791 |
25.01 |
| 2026-06-09 00:00 |
11:14:33.30 |
-07:30:01.1 |
HIP 54791 |
26.91 |
| 2026-06-09 12:00 |
11:14:44.34 |
-07:29:28.7 |
HIP 54791 |
29.00 |
| 2026-06-10 00:00 |
11:14:55.58 |
-07:28:57.9 |
HIP 55062 |
29.30 |
| 2026-06-10 12:00 |
11:15:07.01 |
-07:28:28.6 |
HIP 55062 |
26.99 |
| 2026-06-11 00:00 |
11:15:18.62 |
-07:28:00.9 |
HIP 55062 |
24.80 |
| 2026-06-11 12:00 |
11:15:30.43 |
-07:27:34.7 |
HIP 55062 |
22.76 |
| 2026-06-12 00:00 |
11:15:42.42 |
-07:27:10.0 |
HIP 55062 |
20.95 |
| 2026-06-12 12:00 |
11:15:54.60 |
-07:26:46.8 |
HIP 55062 |
19.44 |
| 2026-06-13 00:00 |
11:16:06.97 |
-07:26:25.1 |
HIP 55062 |
18.34 |
| 2026-06-13 12:00 |
11:16:19.52 |
-07:26:05.0 |
HIP 55062 |
17.74 |
| 2026-06-14 00:00 |
11:16:32.25 |
-07:25:46.3 |
HIP 55062 |
17.71 |
| 2026-06-14 12:00 |
11:16:45.17 |
-07:25:29.2 |
HIP 55106 |
17.70 |
| 2026-06-15 00:00 |
11:16:58.27 |
-07:25:13.6 |
HIP 55106 |
17.14 |
| 2026-06-15 12:00 |
11:17:11.54 |
-07:24:59.4 |
HIP 55106 |
17.23 |
| 2026-06-16 00:00 |
11:17:25.00 |
-07:24:46.8 |
HIP 55106 |
17.97 |
| 2026-06-16 12:00 |
11:17:38.64 |
-07:24:35.7 |
HIP 55106 |
19.32 |
| 2026-06-17 00:00 |
11:17:52.45 |
-07:24:26.1 |
HIP 55106 |
21.18 |
| 2026-06-17 12:00 |
11:18:06.44 |
-07:24:17.9 |
HIP 55287 |
21.35 |
| 2026-06-18 00:00 |
11:18:20.60 |
-07:24:11.3 |
HIP 55287 |
18.40 |
| 2026-06-18 12:00 |
11:18:34.94 |
-07:24:06.1 |
HIP 55287 |
15.62 |
| 2026-06-19 00:00 |
11:18:49.45 |
-07:24:02.4 |
HIP 55287 |
13.19 |
| 2026-06-19 12:00 |
11:19:04.12 |
-07:24:00.2 |
HIP 55287 |
11.34 |
| 2026-06-20 00:00 |
11:19:18.97 |
-07:23:59.4 |
HIP 55287 |
10.46 |
| 2026-06-20 12:00 |
11:19:33.99 |
-07:24:00.1 |
HIP 55287 |
10.81 |
| 2026-06-21 00:00 |
11:19:49.17 |
-07:24:02.2 |
HIP 55287 |
12.33 |
| 2026-06-21 12:00 |
11:20:04.52 |
-07:24:05.8 |
HIP 55287 |
14.70 |
| 2026-06-22 00:00 |
11:20:20.04 |
-07:24:10.8 |
HIP 55287 |
17.59 |