メタデータ
| 項目 |
値 |
| Designation |
C/2020 T2 (Palomar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-07-11T03:28:26.996160Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:24Z |
| Obs used |
2755 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-10-07T12:21:14.400000Z |
| Discovery magnitude (MPC) |
19.33 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-05-15.0000000 |
| e |
0.99342864 |
| q (au) |
2.054696 |
| a (au) |
312.674502 |
| i (deg) |
27.872916 |
| Ω (om, deg) |
83.048376 |
| ω (w, deg) |
150.381486 |
| M (ma, deg) |
359.989813 |
等級
散乱 + 全体線形
$$
M_a = (7.304 + 5.380\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.304 |
| n |
5.380 |
| gf |
1.000 |
| gb |
-0.950 |
| k |
0.999 |
| 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 |
| 2019-12-11 |
2021-07-11 |
+4.3372 |
-2.066 |
| 2021-07-11 |
2022-09-21 |
+1.1158 |
-2.046 |
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) |
| 2026-03-26 00:00 |
01:18:07.24 |
-18:51:51.1 |
HIP 6052 |
9.14 |
| 2026-03-26 12:00 |
01:18:15.83 |
-18:50:48.7 |
HIP 6052 |
9.87 |
| 2026-03-27 00:00 |
01:18:24.42 |
-18:49:46.6 |
HIP 6052 |
11.04 |
| 2026-03-27 12:00 |
01:18:33.03 |
-18:48:44.9 |
HIP 6052 |
12.53 |
| 2026-03-28 00:00 |
01:18:41.65 |
-18:47:43.6 |
HIP 6052 |
14.23 |
| 2026-03-28 12:00 |
01:18:50.28 |
-18:46:42.6 |
HIP 6052 |
16.08 |
| 2026-03-29 00:00 |
01:18:58.92 |
-18:45:42.0 |
HIP 6052 |
18.04 |
| 2026-03-29 12:00 |
01:19:07.56 |
-18:44:41.9 |
HIP 6052 |
20.06 |
| 2026-03-30 00:00 |
01:19:16.22 |
-18:43:42.0 |
HIP 6052 |
22.14 |
| 2026-03-30 12:00 |
01:19:24.89 |
-18:42:42.6 |
HIP 6052 |
24.25 |
| 2026-03-31 00:00 |
01:19:33.56 |
-18:41:43.6 |
HIP 6052 |
26.40 |
| 2026-03-31 12:00 |
01:19:42.24 |
-18:40:44.9 |
HIP 6052 |
28.56 |
| 2026-04-01 00:00 |
01:19:50.93 |
-18:39:46.7 |
HIP 6052 |
30.74 |
| 2026-04-01 12:00 |
01:19:59.63 |
-18:38:48.8 |
HIP 6052 |
32.94 |
| 2026-04-02 00:00 |
01:20:08.33 |
-18:37:51.3 |
HIP 6425 |
34.65 |
| 2026-04-02 12:00 |
01:20:17.04 |
-18:36:54.3 |
HIP 6425 |
33.01 |
| 2026-04-03 00:00 |
01:20:25.76 |
-18:35:57.6 |
HIP 6425 |
31.45 |
| 2026-04-03 12:00 |
01:20:34.48 |
-18:35:01.3 |
HIP 6425 |
29.97 |
| 2026-04-04 00:00 |
01:20:43.21 |
-18:34:05.5 |
HIP 6425 |
28.59 |
| 2026-04-04 12:00 |
01:20:51.94 |
-18:33:10.0 |
HIP 6425 |
27.33 |
| 2026-04-05 00:00 |
01:21:00.67 |
-18:32:15.0 |
HIP 6425 |
26.20 |
| 2026-04-05 12:00 |
01:21:09.41 |
-18:31:20.3 |
HIP 6425 |
25.21 |
| 2026-04-06 00:00 |
01:21:18.15 |
-18:30:26.1 |
HIP 6425 |
24.39 |
| 2026-04-06 12:00 |
01:21:26.90 |
-18:29:32.3 |
HIP 6425 |
23.75 |
| 2026-04-07 00:00 |
01:21:35.64 |
-18:28:38.9 |
HIP 6425 |
23.30 |
| 2026-04-07 12:00 |
01:21:44.39 |
-18:27:46.0 |
HIP 6425 |
23.06 |
| 2026-04-08 00:00 |
01:21:53.14 |
-18:26:53.4 |
HIP 6425 |
23.04 |
| 2026-04-08 12:00 |
01:22:01.89 |
-18:26:01.3 |
HIP 6425 |
23.22 |
| 2026-04-09 00:00 |
01:22:10.65 |
-18:25:09.6 |
HIP 6425 |
23.61 |
| 2026-04-09 12:00 |
01:22:19.40 |
-18:24:18.4 |
HIP 6425 |
24.20 |
| 2026-04-10 00:00 |
01:22:28.15 |
-18:23:27.6 |
HIP 6425 |
24.96 |
| 2026-04-10 12:00 |
01:22:36.91 |
-18:22:37.2 |
HIP 6425 |
25.90 |
| 2026-04-11 00:00 |
01:22:45.66 |
-18:21:47.2 |
HIP 6425 |
26.97 |
| 2026-04-11 12:00 |
01:22:54.41 |
-18:20:57.7 |
HIP 6585 |
25.22 |
| 2026-04-12 00:00 |
01:23:03.16 |
-18:20:08.6 |
HIP 6585 |
23.00 |
| 2026-04-12 12:00 |
01:23:11.90 |
-18:19:20.0 |
HIP 6585 |
20.77 |
| 2026-04-13 00:00 |
01:23:20.65 |
-18:18:31.8 |
HIP 6585 |
18.55 |
| 2026-04-13 12:00 |
01:23:29.39 |
-18:17:44.1 |
HIP 6585 |
16.34 |
| 2026-04-14 00:00 |
01:23:38.12 |
-18:16:56.8 |
HIP 6585 |
14.13 |
| 2026-04-14 12:00 |
01:23:46.85 |
-18:16:10.0 |
HIP 6585 |
11.93 |
| 2026-04-15 00:00 |
01:23:55.58 |
-18:15:23.6 |
HIP 6585 |
9.74 |
| 2026-04-15 12:00 |
01:24:04.31 |
-18:14:37.7 |
HIP 6585 |
7.56 |
| 2026-04-16 00:00 |
01:24:13.02 |
-18:13:52.3 |
HIP 6585 |
5.40 |