メタデータ
| 項目 |
値 |
| Designation |
479P/Elenin |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-05-05T07:27:38.416320Z |
| Orbit solution date (soln_date, UTC) |
2024-08-11T00:12:26Z |
| Obs used |
990 |
| NEO |
Yes |
| M1 |
16.200 |
| K1 |
6.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-11-18T13:30:33.264000Z |
| Discovery magnitude (MPC) |
21.79 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-03-04.0000000 |
| e |
0.77856369 |
| q (au) |
1.244472 |
| a (au) |
5.619998 |
| i (deg) |
15.393352 |
| Ω (om, deg) |
295.845766 |
| ω (w, deg) |
263.493717 |
| M (ma, deg) |
328.314623 |
等級
散乱 + 全体線形
$$
M_a = (15.000 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.000 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.637 |
| k |
0.800 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2023-10-17 |
2024-05-04 |
+6.0878 |
-1.609 |
| 2024-05-05 |
2024-08-05 |
+11.6597 |
-2.541 |
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) |
| 2026-09-20 00:00 |
22:52:00.62 |
+08:29:23.4 |
HIP 113029 |
21.89 |
| 2026-09-20 12:00 |
22:51:46.64 |
+08:27:49.0 |
HIP 113029 |
25.18 |
| 2026-09-21 00:00 |
22:51:32.73 |
+08:26:14.3 |
HIP 113029 |
28.57 |
| 2026-09-21 12:00 |
22:51:18.88 |
+08:24:39.3 |
HIP 113029 |
32.04 |
| 2026-09-22 00:00 |
22:51:05.10 |
+08:23:03.9 |
HIP 112659 |
33.06 |
| 2026-09-22 12:00 |
22:50:51.38 |
+08:21:28.3 |
HIP 112659 |
30.37 |
| 2026-09-23 00:00 |
22:50:37.73 |
+08:19:52.4 |
HIP 112659 |
27.95 |
| 2026-09-23 12:00 |
22:50:24.16 |
+08:18:16.3 |
HIP 112659 |
25.86 |
| 2026-09-24 00:00 |
22:50:10.65 |
+08:16:40.0 |
HIP 112659 |
24.17 |
| 2026-09-24 12:00 |
22:49:57.22 |
+08:15:03.4 |
HIP 112659 |
22.98 |
| 2026-09-25 00:00 |
22:49:43.87 |
+08:13:26.6 |
HIP 112659 |
22.36 |
| 2026-09-25 12:00 |
22:49:30.59 |
+08:11:49.6 |
HIP 112659 |
22.34 |
| 2026-09-26 00:00 |
22:49:17.39 |
+08:10:12.4 |
HIP 112630 |
21.51 |
| 2026-09-26 12:00 |
22:49:04.27 |
+08:08:35.1 |
HIP 112630 |
18.80 |
| 2026-09-27 00:00 |
22:48:51.23 |
+08:06:57.5 |
HIP 112630 |
16.45 |
| 2026-09-27 12:00 |
22:48:38.28 |
+08:05:19.9 |
HIP 112630 |
14.62 |
| 2026-09-28 00:00 |
22:48:25.40 |
+08:03:42.1 |
HIP 112630 |
13.52 |
| 2026-09-28 12:00 |
22:48:12.62 |
+08:02:04.2 |
HIP 112630 |
13.30 |
| 2026-09-29 00:00 |
22:47:59.92 |
+08:00:26.2 |
HIP 112630 |
14.00 |
| 2026-09-29 12:00 |
22:47:47.31 |
+07:58:48.1 |
HIP 112630 |
15.48 |
| 2026-09-30 00:00 |
22:47:34.79 |
+07:57:09.9 |
HIP 112518 |
14.71 |
| 2026-09-30 12:00 |
22:47:22.36 |
+07:55:31.6 |
HIP 112518 |
13.10 |
| 2026-10-01 00:00 |
22:47:10.02 |
+07:53:53.3 |
HIP 112518 |
12.29 |
| 2026-10-01 12:00 |
22:46:57.78 |
+07:52:15.0 |
HIP 112518 |
12.41 |
| 2026-10-02 00:00 |
22:46:45.63 |
+07:50:36.6 |
HIP 112518 |
13.43 |
| 2026-10-02 12:00 |
22:46:33.57 |
+07:48:58.2 |
HIP 112433 |
14.05 |
| 2026-10-03 00:00 |
22:46:21.62 |
+07:47:19.8 |
HIP 112433 |
12.47 |
| 2026-10-03 12:00 |
22:46:09.76 |
+07:45:41.4 |
HIP 112433 |
11.69 |
| 2026-10-04 00:00 |
22:45:58.01 |
+07:44:03.0 |
HIP 112433 |
11.82 |
| 2026-10-04 12:00 |
22:45:46.36 |
+07:42:24.7 |
HIP 112433 |
12.84 |
| 2026-10-05 00:00 |
22:45:34.81 |
+07:40:46.4 |
HIP 112433 |
14.53 |
| 2026-10-05 12:00 |
22:45:23.36 |
+07:39:08.2 |
HIP 112433 |
16.69 |
| 2026-10-06 00:00 |
22:45:12.02 |
+07:37:30.1 |
HIP 112433 |
19.14 |
| 2026-10-06 12:00 |
22:45:00.79 |
+07:35:52.0 |
HIP 112433 |
21.78 |
| 2026-10-07 00:00 |
22:44:49.67 |
+07:34:14.1 |
HIP 112433 |
24.53 |
| 2026-10-07 12:00 |
22:44:38.65 |
+07:32:36.3 |
HIP 112433 |
27.35 |
| 2026-10-08 00:00 |
22:44:27.75 |
+07:30:58.6 |
HIP 112147 |
27.38 |
| 2026-10-08 12:00 |
22:44:16.96 |
+07:29:21.0 |
HIP 112147 |
26.25 |
| 2026-10-09 00:00 |
22:44:06.28 |
+07:27:43.7 |
HIP 112147 |
25.48 |
| 2026-10-09 12:00 |
22:43:55.72 |
+07:26:06.5 |
HIP 112147 |
25.08 |
| 2026-10-10 00:00 |
22:43:45.27 |
+07:24:29.4 |
HIP 112147 |
25.06 |
| 2026-10-10 12:00 |
22:43:34.94 |
+07:22:52.6 |
HIP 112147 |
25.42 |
| 2026-10-11 00:00 |
22:43:24.73 |
+07:21:16.0 |
HIP 112147 |
26.14 |