メタデータ
| 項目 |
値 |
| Designation |
P/2021 N1 (ZTF) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-06-06T13:17:58.335360Z |
| Orbit solution date (soln_date, UTC) |
2022-10-07T00:43:31Z |
| Obs used |
96 |
| NEO |
Yes |
| M1 |
17.800 |
| K1 |
21.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-07-02T11:08:00.096000Z |
| Discovery magnitude (MPC) |
18.94 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) |
2021-07-07.0000000 |
| e |
0.67679260 |
| q (au) |
0.962147 |
| a (au) |
2.976871 |
| i (deg) |
11.505610 |
| Ω (om, deg) |
301.158449 |
| ω (w, deg) |
21.189770 |
| M (ma, deg) |
5.842413 |
等級
散乱 + 全体線形
$$
M_a = (17.269 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.269 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
16:34:26.34 |
-39:10:54.6 |
HIP 81029 |
19.89 |
| 2026-03-26 12:00 |
16:35:22.75 |
-39:16:51.3 |
HIP 81380 |
26.82 |
| 2026-03-27 00:00 |
16:36:19.30 |
-39:22:48.7 |
HIP 81449 |
22.07 |
| 2026-03-27 12:00 |
16:37:16.01 |
-39:28:46.8 |
HIP 81449 |
10.01 |
| 2026-03-28 00:00 |
16:38:12.88 |
-39:34:45.7 |
HIP 81449 |
4.99 |
| 2026-03-28 12:00 |
16:39:09.91 |
-39:40:45.3 |
HIP 81488 |
9.79 |
| 2026-03-29 00:00 |
16:40:07.10 |
-39:46:45.7 |
HIP 81643 |
9.17 |
| 2026-03-29 12:00 |
16:41:04.46 |
-39:52:46.8 |
HIP 81643 |
4.26 |
| 2026-03-30 00:00 |
16:42:02.00 |
-39:58:48.7 |
HIP 81643 |
16.36 |
| 2026-03-30 12:00 |
16:42:59.71 |
-40:04:51.3 |
HIP 81824 |
12.64 |
| 2026-03-31 00:00 |
16:43:57.60 |
-40:10:54.8 |
HIP 81824 |
14.41 |
| 2026-03-31 12:00 |
16:44:55.67 |
-40:16:59.0 |
HIP 81824 |
23.96 |
| 2026-04-01 00:00 |
16:45:53.94 |
-40:23:03.9 |
HIP 82077 |
30.45 |
| 2026-04-01 12:00 |
16:46:52.39 |
-40:29:09.7 |
HIP 82227 |
31.41 |
| 2026-04-02 00:00 |
16:47:51.05 |
-40:35:16.3 |
HIP 82227 |
23.10 |
| 2026-04-02 12:00 |
16:48:49.90 |
-40:41:23.7 |
HIP 82227 |
20.05 |
| 2026-04-03 00:00 |
16:49:48.96 |
-40:47:31.9 |
HIP 82227 |
24.38 |
| 2026-04-03 12:00 |
16:50:48.22 |
-40:53:40.9 |
HIP 82554 |
21.41 |
| 2026-04-04 00:00 |
16:51:47.70 |
-40:59:50.7 |
HIP 82493 |
14.23 |
| 2026-04-04 12:00 |
16:52:47.40 |
-41:06:01.4 |
HIP 82685 |
14.73 |
| 2026-04-05 00:00 |
16:53:47.32 |
-41:12:12.8 |
HIP 82685 |
8.18 |
| 2026-04-05 12:00 |
16:54:47.46 |
-41:18:25.2 |
HIP 82775 |
9.60 |
| 2026-04-06 00:00 |
16:55:47.84 |
-41:24:38.3 |
HIP 82775 |
18.13 |
| 2026-04-06 12:00 |
16:56:48.45 |
-41:30:52.3 |
HIP 83025 |
18.43 |
| 2026-04-07 00:00 |
16:57:49.30 |
-41:37:07.1 |
HIP 83025 |
19.19 |
| 2026-04-07 12:00 |
16:58:50.40 |
-41:43:22.8 |
HIP 83161 |
18.26 |
| 2026-04-08 00:00 |
16:59:51.75 |
-41:49:39.3 |
HIP 83161 |
9.19 |
| 2026-04-08 12:00 |
17:00:53.36 |
-41:55:56.6 |
HIP 83266 |
8.69 |
| 2026-04-09 00:00 |
17:01:55.23 |
-42:02:14.8 |
HIP 83266 |
9.36 |
| 2026-04-09 12:00 |
17:02:57.37 |
-42:08:33.9 |
HIP 83403 |
6.78 |
| 2026-04-10 00:00 |
17:03:59.78 |
-42:14:53.8 |
HIP 83403 |
13.66 |
| 2026-04-10 12:00 |
17:05:02.47 |
-42:21:14.5 |
HIP 83403 |
25.99 |
| 2026-04-11 00:00 |
17:06:05.44 |
-42:27:36.1 |
HIP 83882 |
31.78 |
| 2026-04-11 12:00 |
17:07:08.71 |
-42:33:58.5 |
HIP 83882 |
18.51 |
| 2026-04-12 00:00 |
17:08:12.28 |
-42:40:21.7 |
HIP 83882 |
5.30 |
| 2026-04-12 12:00 |
17:09:16.16 |
-42:46:45.8 |
HIP 83882 |
8.33 |
| 2026-04-13 00:00 |
17:10:20.35 |
-42:53:10.7 |
HIP 83882 |
21.67 |
| 2026-04-13 12:00 |
17:11:24.86 |
-42:59:36.5 |
HIP 84143 |
16.78 |
| 2026-04-14 00:00 |
17:12:29.69 |
-43:06:03.0 |
HIP 84143 |
9.07 |
| 2026-04-14 12:00 |
17:13:34.87 |
-43:12:30.4 |
HIP 84143 |
15.71 |
| 2026-04-15 00:00 |
17:14:40.39 |
-43:18:58.5 |
HIP 84331 |
19.41 |
| 2026-04-15 12:00 |
17:15:46.26 |
-43:25:27.5 |
HIP 84331 |
19.40 |
| 2026-04-16 00:00 |
17:16:52.49 |
-43:31:57.2 |
HIP 84628 |
12.77 |