501P/Rankin
メタデータ
| 項目 |
値 |
| Designation |
501P/Rankin |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-12-10T08:39:13.299840Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T16:54:57Z |
| Obs used |
98 |
| NEO |
Yes |
| M1 |
21.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-06-15T10:13:37.545600Z |
| Discovery magnitude (MPC) |
20.90 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-05-24.0000000 |
| e |
0.69572032 |
| q (au) |
0.680308 |
| a (au) |
2.235797 |
| i (deg) |
10.104448 |
| Ω (om, deg) |
140.492867 |
| ω (w, deg) |
52.799047 |
| M (ma, deg) |
156.147750 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.852 |
| k |
0.990 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2024-03-22 |
2024-07-29 |
-14.2233 |
+1.816 |
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) |
| 2026-02-03 00:00 |
00:30:11.09 |
-04:48:34.6 |
HIP 2533 |
36.60 |
| 2026-02-03 12:00 |
00:30:33.07 |
-04:45:41.3 |
HIP 2482 |
32.27 |
| 2026-02-04 00:00 |
00:30:55.17 |
-04:42:47.5 |
HIP 2482 |
27.43 |
| 2026-02-04 12:00 |
00:31:17.38 |
-04:39:53.4 |
HIP 2482 |
23.25 |
| 2026-02-05 00:00 |
00:31:39.70 |
-04:36:58.9 |
HIP 2482 |
20.17 |
| 2026-02-05 12:00 |
00:32:02.13 |
-04:34:03.9 |
HIP 2482 |
18.76 |
| 2026-02-06 00:00 |
00:32:24.67 |
-04:31:08.6 |
HIP 2482 |
19.42 |
| 2026-02-06 12:00 |
00:32:47.32 |
-04:28:13.0 |
HIP 2482 |
21.99 |
| 2026-02-07 00:00 |
00:33:10.09 |
-04:25:16.9 |
HIP 2713 |
21.23 |
| 2026-02-07 12:00 |
00:33:32.96 |
-04:22:20.5 |
HIP 2713 |
17.60 |
| 2026-02-08 00:00 |
00:33:55.93 |
-04:19:23.8 |
HIP 2715 |
15.76 |
| 2026-02-08 12:00 |
00:34:19.02 |
-04:16:26.7 |
HIP 2715 |
16.37 |
| 2026-02-09 00:00 |
00:34:42.20 |
-04:13:29.2 |
HIP 2715 |
19.29 |
| 2026-02-09 12:00 |
00:35:05.50 |
-04:10:31.4 |
HIP 2715 |
23.68 |
| 2026-02-10 00:00 |
00:35:28.90 |
-04:07:33.3 |
HIP 2715 |
28.91 |
| 2026-02-10 12:00 |
00:35:52.40 |
-04:04:34.9 |
HIP 2762 |
30.51 |
| 2026-02-11 00:00 |
00:36:16.00 |
-04:01:36.1 |
HIP 2762 |
30.20 |
| 2026-02-11 12:00 |
00:36:39.70 |
-03:58:37.0 |
HIP 2762 |
31.33 |
| 2026-02-12 00:00 |
00:37:03.51 |
-03:55:37.7 |
HIP 2917 |
31.63 |
| 2026-02-12 12:00 |
00:37:27.41 |
-03:52:38.0 |
HIP 3082 |
26.40 |
| 2026-02-13 00:00 |
00:37:51.41 |
-03:49:38.1 |
HIP 3082 |
21.87 |
| 2026-02-13 12:00 |
00:38:15.51 |
-03:46:37.8 |
HIP 3082 |
18.68 |
| 2026-02-14 00:00 |
00:38:39.71 |
-03:43:37.3 |
HIP 3082 |
17.59 |
| 2026-02-14 12:00 |
00:39:04.00 |
-03:40:36.5 |
HIP 3082 |
19.00 |
| 2026-02-15 00:00 |
00:39:28.39 |
-03:37:35.5 |
HIP 3082 |
22.47 |
| 2026-02-15 12:00 |
00:39:52.87 |
-03:34:34.2 |
HIP 3082 |
27.23 |
| 2026-02-16 00:00 |
00:40:17.45 |
-03:31:32.6 |
HIP 3115 |
28.31 |
| 2026-02-16 12:00 |
00:40:42.11 |
-03:28:30.8 |
HIP 3115 |
28.42 |
| 2026-02-17 00:00 |
00:41:06.87 |
-03:25:28.8 |
HIP 3311 |
27.11 |
| 2026-02-17 12:00 |
00:41:31.72 |
-03:22:26.5 |
HIP 3311 |
21.30 |
| 2026-02-18 00:00 |
00:41:56.66 |
-03:19:24.0 |
HIP 3311 |
16.37 |
| 2026-02-18 12:00 |
00:42:21.69 |
-03:16:21.3 |
HIP 3311 |
13.33 |
| 2026-02-19 00:00 |
00:42:46.80 |
-03:13:18.4 |
HIP 3311 |
13.59 |
| 2026-02-19 12:00 |
00:43:12.00 |
-03:10:15.3 |
HIP 3435 |
10.97 |
| 2026-02-20 00:00 |
00:43:37.29 |
-03:07:12.1 |
HIP 3435 |
4.01 |
| 2026-02-20 12:00 |
00:44:02.66 |
-03:04:08.6 |
HIP 3435 |
3.21 |
| 2026-02-21 00:00 |
00:44:28.12 |
-03:01:04.9 |
HIP 3435 |
10.20 |
| 2026-02-21 12:00 |
00:44:53.66 |
-02:58:01.1 |
HIP 3435 |
17.26 |
| 2026-02-22 00:00 |
00:45:19.28 |
-02:54:57.1 |
HIP 3435 |
24.35 |
| 2026-02-22 12:00 |
00:45:44.98 |
-02:51:53.0 |
HIP 3435 |
31.46 |
| 2026-02-23 00:00 |
00:46:10.76 |
-02:48:48.7 |
HIP 3708 |
36.51 |
| 2026-02-23 12:00 |
00:46:36.62 |
-02:45:44.3 |
HIP 3708 |
30.41 |
| 2026-02-24 00:00 |
00:47:02.56 |
-02:42:39.7 |
HIP 3708 |
24.87 |