P/2021 N1 (ZTF)
메타데이터
| 항목 |
값 |
| 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 |
Osculating 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (17.269 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.269 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
15:06:26.12 |
-29:47:40.2 |
HIP 73824 |
18.81 |
| 2026-02-03 12:00 |
15:07:14.74 |
-29:52:56.0 |
HIP 73990 |
22.67 |
| 2026-02-04 00:00 |
15:08:03.41 |
-29:58:12.0 |
HIP 74207 |
24.81 |
| 2026-02-04 12:00 |
15:08:52.14 |
-30:03:28.1 |
HIP 74207 |
18.51 |
| 2026-02-05 00:00 |
15:09:40.92 |
-30:08:44.5 |
HIP 74207 |
18.66 |
| 2026-02-05 12:00 |
15:10:29.75 |
-30:14:01.0 |
HIP 74207 |
25.16 |
| 2026-02-06 00:00 |
15:11:18.63 |
-30:19:17.7 |
HIP 74469 |
33.73 |
| 2026-02-06 12:00 |
15:12:07.57 |
-30:24:34.6 |
HIP 74469 |
23.30 |
| 2026-02-07 00:00 |
15:12:56.55 |
-30:29:51.7 |
HIP 74469 |
15.05 |
| 2026-02-07 12:00 |
15:13:45.59 |
-30:35:09.0 |
HIP 74469 |
13.72 |
| 2026-02-08 00:00 |
15:14:34.68 |
-30:40:26.5 |
HIP 74705 |
19.36 |
| 2026-02-08 12:00 |
15:15:23.83 |
-30:45:44.2 |
HIP 74705 |
8.71 |
| 2026-02-09 00:00 |
15:16:13.02 |
-30:51:02.2 |
HIP 74705 |
7.51 |
| 2026-02-09 12:00 |
15:17:02.27 |
-30:56:20.3 |
HIP 74705 |
17.79 |
| 2026-02-10 00:00 |
15:17:51.57 |
-31:01:38.6 |
HIP 74929 |
15.25 |
| 2026-02-10 12:00 |
15:18:40.92 |
-31:06:57.2 |
HIP 74929 |
5.61 |
| 2026-02-11 00:00 |
15:19:30.32 |
-31:12:15.9 |
HIP 74929 |
10.48 |
| 2026-02-11 12:00 |
15:20:19.77 |
-31:17:34.9 |
HIP 74929 |
21.64 |
| 2026-02-12 00:00 |
15:21:09.28 |
-31:22:54.1 |
HIP 75200 |
14.69 |
| 2026-02-12 12:00 |
15:21:58.84 |
-31:28:13.5 |
HIP 75200 |
4.02 |
| 2026-02-13 00:00 |
15:22:48.45 |
-31:33:33.1 |
HIP 75200 |
9.83 |
| 2026-02-13 12:00 |
15:23:38.11 |
-31:38:53.0 |
HIP 75404 |
13.38 |
| 2026-02-14 00:00 |
15:24:27.82 |
-31:44:13.1 |
HIP 75438 |
3.42 |
| 2026-02-14 12:00 |
15:25:17.58 |
-31:49:33.4 |
HIP 75438 |
8.49 |
| 2026-02-15 00:00 |
15:26:07.40 |
-31:54:54.0 |
HIP 75592 |
17.44 |
| 2026-02-15 12:00 |
15:26:57.27 |
-32:00:14.8 |
HIP 75592 |
22.03 |
| 2026-02-16 00:00 |
15:27:47.19 |
-32:05:35.9 |
HIP 75592 |
30.79 |
| 2026-02-16 12:00 |
15:28:37.16 |
-32:10:57.2 |
HIP 75924 |
24.18 |
| 2026-02-17 00:00 |
15:29:27.18 |
-32:16:18.7 |
HIP 75924 |
12.63 |
| 2026-02-17 12:00 |
15:30:17.26 |
-32:21:40.5 |
HIP 75924 |
3.95 |
| 2026-02-18 00:00 |
15:31:07.39 |
-32:27:02.6 |
HIP 75924 |
12.39 |
| 2026-02-18 12:00 |
15:31:57.57 |
-32:32:24.9 |
HIP 76037 |
5.68 |
| 2026-02-19 00:00 |
15:32:47.81 |
-32:37:47.4 |
HIP 76037 |
13.27 |
| 2026-02-19 12:00 |
15:33:38.09 |
-32:43:10.3 |
HIP 76037 |
24.53 |
| 2026-02-20 00:00 |
15:34:28.44 |
-32:48:33.4 |
HIP 76217 |
22.06 |
| 2026-02-20 12:00 |
15:35:18.84 |
-32:53:56.8 |
HIP 76395 |
16.01 |
| 2026-02-21 00:00 |
15:36:09.29 |
-32:59:20.4 |
HIP 76395 |
6.24 |
| 2026-02-21 12:00 |
15:36:59.80 |
-33:04:44.4 |
HIP 76395 |
10.18 |
| 2026-02-22 00:00 |
15:37:50.37 |
-33:10:08.6 |
HIP 76395 |
21.22 |
| 2026-02-22 12:00 |
15:38:40.99 |
-33:15:33.1 |
HIP 76701 |
21.04 |
| 2026-02-23 00:00 |
15:39:31.67 |
-33:20:58.0 |
HIP 76803 |
21.31 |
| 2026-02-23 12:00 |
15:40:22.41 |
-33:26:23.1 |
HIP 76803 |
18.92 |
| 2026-02-24 00:00 |
15:41:13.21 |
-33:31:48.6 |
HIP 76803 |
23.36 |