メタデータ
| 項目 |
値 |
| Designation |
502P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-08-03T10:00:58.357440Z |
| Orbit solution date (soln_date, UTC) |
2026-09-21T07:12:14Z |
| Obs used |
333 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
15.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2025-04-23T10:52:57.561600Z |
| Discovery magnitude (MPC) |
20.32 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-01-20.0000000 |
| e |
0.47195285 |
| q (au) |
4.248240 |
| a (au) |
8.045190 |
| i (deg) |
11.389378 |
| Ω (om, deg) |
264.605201 |
| ω (w, deg) |
37.228355 |
| M (ma, deg) |
256.883546 |
等級
散乱 + 全体線形
$$
M_a = (10.043 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.043 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.725 |
| k |
0.800 |
| δ90 |
9.999 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2024-07-01 |
2025-08-05 |
+24.7671 |
-15.558 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
23:09:30.62 |
+10:08:55.8 |
HIP 114389 |
21.02 |
| 2026-09-25 12:00 |
23:09:18.12 |
+10:07:11.4 |
HIP 114389 |
20.81 |
| 2026-09-26 00:00 |
23:09:05.70 |
+10:05:26.5 |
HIP 114389 |
21.17 |
| 2026-09-26 12:00 |
23:08:53.37 |
+10:03:41.2 |
HIP 114389 |
22.08 |
| 2026-09-27 00:00 |
23:08:41.13 |
+10:01:55.4 |
HIP 114389 |
23.45 |
| 2026-09-27 12:00 |
23:08:28.98 |
+10:00:09.2 |
HIP 114389 |
25.22 |
| 2026-09-28 00:00 |
23:08:16.93 |
+09:58:22.6 |
HIP 114389 |
27.29 |
| 2026-09-28 12:00 |
23:08:04.98 |
+09:56:35.6 |
HIP 114389 |
29.60 |
| 2026-09-29 00:00 |
23:07:53.12 |
+09:54:48.2 |
HIP 114061 |
31.09 |
| 2026-09-29 12:00 |
23:07:41.37 |
+09:53:00.5 |
HIP 114061 |
27.72 |
| 2026-09-30 00:00 |
23:07:29.72 |
+09:51:12.4 |
HIP 114061 |
24.38 |
| 2026-09-30 12:00 |
23:07:18.17 |
+09:49:24.1 |
HIP 114061 |
21.08 |
| 2026-10-01 00:00 |
23:07:06.74 |
+09:47:35.5 |
HIP 114061 |
17.82 |
| 2026-10-01 12:00 |
23:06:55.41 |
+09:45:46.6 |
HIP 114061 |
14.64 |
| 2026-10-02 00:00 |
23:06:44.20 |
+09:43:57.5 |
HIP 114061 |
11.57 |
| 2026-10-02 12:00 |
23:06:33.11 |
+09:42:08.1 |
HIP 114061 |
8.69 |
| 2026-10-03 00:00 |
23:06:22.13 |
+09:40:18.6 |
HIP 114061 |
6.27 |
| 2026-10-03 12:00 |
23:06:11.26 |
+09:38:28.9 |
HIP 114061 |
4.96 |
| 2026-10-04 00:00 |
23:06:00.53 |
+09:36:39.0 |
HIP 114061 |
5.56 |
| 2026-10-04 12:00 |
23:05:49.91 |
+09:34:49.0 |
HIP 114061 |
7.61 |
| 2026-10-05 00:00 |
23:05:39.42 |
+09:32:58.9 |
HIP 114061 |
10.25 |
| 2026-10-05 12:00 |
23:05:29.06 |
+09:31:08.6 |
HIP 114061 |
13.11 |
| 2026-10-06 00:00 |
23:05:18.83 |
+09:29:18.4 |
HIP 114061 |
16.06 |
| 2026-10-06 12:00 |
23:05:08.73 |
+09:27:28.0 |
HIP 114061 |
19.04 |
| 2026-10-07 00:00 |
23:04:58.76 |
+09:25:37.7 |
HIP 113966 |
21.58 |
| 2026-10-07 12:00 |
23:04:48.93 |
+09:23:47.3 |
HIP 113966 |
19.59 |
| 2026-10-08 00:00 |
23:04:39.24 |
+09:21:57.0 |
HIP 113966 |
17.88 |
| 2026-10-08 12:00 |
23:04:29.69 |
+09:20:06.7 |
HIP 113966 |
16.55 |
| 2026-10-09 00:00 |
23:04:20.28 |
+09:18:16.5 |
HIP 113966 |
15.66 |
| 2026-10-09 12:00 |
23:04:11.02 |
+09:16:26.3 |
HIP 113966 |
15.28 |
| 2026-10-10 00:00 |
23:04:01.90 |
+09:14:36.3 |
HIP 113966 |
15.44 |
| 2026-10-10 12:00 |
23:03:52.93 |
+09:12:46.4 |
HIP 113966 |
16.10 |
| 2026-10-11 00:00 |
23:03:44.10 |
+09:10:56.6 |
HIP 113859 |
13.72 |
| 2026-10-11 12:00 |
23:03:35.43 |
+09:09:07.1 |
HIP 113859 |
11.49 |
| 2026-10-12 00:00 |
23:03:26.92 |
+09:07:17.7 |
HIP 113859 |
9.58 |
| 2026-10-12 12:00 |
23:03:18.55 |
+09:05:28.5 |
HIP 113859 |
8.17 |
| 2026-10-13 00:00 |
23:03:10.35 |
+09:03:39.6 |
HIP 113859 |
7.53 |
| 2026-10-13 12:00 |
23:03:02.30 |
+09:01:51.0 |
HIP 113859 |
7.81 |
| 2026-10-14 00:00 |
23:02:54.41 |
+09:00:02.6 |
HIP 113859 |
8.89 |
| 2026-10-14 12:00 |
23:02:46.68 |
+08:58:14.5 |
HIP 113859 |
10.50 |
| 2026-10-15 00:00 |
23:02:39.11 |
+08:56:26.7 |
HIP 113859 |
12.43 |
| 2026-10-15 12:00 |
23:02:31.71 |
+08:54:39.3 |
HIP 113859 |
14.52 |
| 2026-10-16 00:00 |
23:02:24.47 |
+08:52:52.2 |
HIP 113722 |
15.39 |