메타데이터
| 항목 |
값 |
| Designation |
417P/NEOWISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-04-21T21:50:27.404160Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:06:24Z |
| Obs used |
277 |
| NEO |
- |
| M1 |
17.500 |
| K1 |
6.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-01-17T05:24:50.284800Z |
| Discovery magnitude (MPC) |
20.40 T |
| Discovery observatory (MPC) |
Z84 · Calar Alto-Schmidt |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-01-27.0000000 |
| e |
0.55459375 |
| q (au) |
1.492286 |
| a (au) |
3.350393 |
| i (deg) |
8.129115 |
| Ω (om, deg) |
111.357188 |
| ω (w, deg) |
129.397423 |
| M (ma, deg) |
228.869825 |
밝기
산란 + 전체 선형
$$
M_a = (17.824 + 3.206\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.824 |
| n |
3.206 |
| gf |
0.800 |
| gb |
-0.673 |
| k |
0.914 |
| δ90 |
1.000 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
06:12:37.09 |
+26:11:25.2 |
HIP 29390 |
20.95 |
| 2026-03-26 12:00 |
06:12:50.47 |
+26:11:40.9 |
HIP 29390 |
22.80 |
| 2026-03-27 00:00 |
06:13:04.13 |
+26:11:56.4 |
HIP 29390 |
24.93 |
| 2026-03-27 12:00 |
06:13:18.06 |
+26:12:11.7 |
HIP 29390 |
27.30 |
| 2026-03-28 00:00 |
06:13:32.27 |
+26:12:26.8 |
HIP 29390 |
29.86 |
| 2026-03-28 12:00 |
06:13:46.75 |
+26:12:41.6 |
HIP 29390 |
32.59 |
| 2026-03-29 00:00 |
06:14:01.49 |
+26:12:56.3 |
HIP 29390 |
35.46 |
| 2026-03-29 12:00 |
06:14:16.51 |
+26:13:10.7 |
HIP 29826 |
38.35 |
| 2026-03-30 00:00 |
06:14:31.79 |
+26:13:24.9 |
HIP 29826 |
35.17 |
| 2026-03-30 12:00 |
06:14:47.34 |
+26:13:38.8 |
HIP 29826 |
32.00 |
| 2026-03-31 00:00 |
06:15:03.15 |
+26:13:52.6 |
HIP 29826 |
28.86 |
| 2026-03-31 12:00 |
06:15:19.23 |
+26:14:06.1 |
HIP 29826 |
25.78 |
| 2026-04-01 00:00 |
06:15:35.56 |
+26:14:19.3 |
HIP 29826 |
22.81 |
| 2026-04-01 12:00 |
06:15:52.16 |
+26:14:32.3 |
HIP 29826 |
20.04 |
| 2026-04-02 00:00 |
06:16:09.01 |
+26:14:45.1 |
HIP 29826 |
17.60 |
| 2026-04-02 12:00 |
06:16:26.12 |
+26:14:57.6 |
HIP 29826 |
15.68 |
| 2026-04-03 00:00 |
06:16:43.48 |
+26:15:09.9 |
HIP 29826 |
14.54 |
| 2026-04-03 12:00 |
06:17:01.10 |
+26:15:21.9 |
HIP 29826 |
14.41 |
| 2026-04-04 00:00 |
06:17:18.97 |
+26:15:33.7 |
HIP 29826 |
15.36 |
| 2026-04-04 12:00 |
06:17:37.10 |
+26:15:45.2 |
HIP 29826 |
17.25 |
| 2026-04-05 00:00 |
06:17:55.47 |
+26:15:56.4 |
HIP 29826 |
19.85 |
| 2026-04-05 12:00 |
06:18:14.09 |
+26:16:07.4 |
HIP 30035 |
21.75 |
| 2026-04-06 00:00 |
06:18:32.96 |
+26:16:18.1 |
HIP 30035 |
19.60 |
| 2026-04-06 12:00 |
06:18:52.07 |
+26:16:28.6 |
HIP 30035 |
18.19 |
| 2026-04-07 00:00 |
06:19:11.43 |
+26:16:38.7 |
HIP 30035 |
17.71 |
| 2026-04-07 12:00 |
06:19:31.03 |
+26:16:48.6 |
HIP 30035 |
18.30 |
| 2026-04-08 00:00 |
06:19:50.87 |
+26:16:58.2 |
HIP 30035 |
19.89 |
| 2026-04-08 12:00 |
06:20:10.95 |
+26:17:07.5 |
HIP 30035 |
22.30 |
| 2026-04-09 00:00 |
06:20:31.28 |
+26:17:16.5 |
HIP 30035 |
25.32 |
| 2026-04-09 12:00 |
06:20:51.84 |
+26:17:25.3 |
HIP 30035 |
28.79 |
| 2026-04-10 00:00 |
06:21:12.63 |
+26:17:33.7 |
HIP 30306 |
27.91 |
| 2026-04-10 12:00 |
06:21:33.66 |
+26:17:41.8 |
HIP 30306 |
25.31 |
| 2026-04-11 00:00 |
06:21:54.93 |
+26:17:49.7 |
HIP 30346 |
23.04 |
| 2026-04-11 12:00 |
06:22:16.43 |
+26:17:57.2 |
HIP 30346 |
20.47 |
| 2026-04-12 00:00 |
06:22:38.16 |
+26:18:04.4 |
HIP 30346 |
18.78 |
| 2026-04-12 12:00 |
06:23:00.12 |
+26:18:11.2 |
HIP 30346 |
18.28 |
| 2026-04-13 00:00 |
06:23:22.31 |
+26:18:17.8 |
HIP 30346 |
19.09 |
| 2026-04-13 12:00 |
06:23:44.73 |
+26:18:24.0 |
HIP 30346 |
21.10 |
| 2026-04-14 00:00 |
06:24:07.37 |
+26:18:29.9 |
HIP 30346 |
24.04 |
| 2026-04-14 12:00 |
06:24:30.24 |
+26:18:35.5 |
HIP 30644 |
27.35 |
| 2026-04-15 00:00 |
06:24:53.34 |
+26:18:40.7 |
HIP 30644 |
22.67 |
| 2026-04-15 12:00 |
06:25:16.65 |
+26:18:45.6 |
HIP 30644 |
18.23 |
| 2026-04-16 00:00 |
06:25:40.19 |
+26:18:50.1 |
HIP 30644 |
14.29 |