메타데이터
| 항목 |
값 |
| Designation |
502P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-08-05T23:40:46.439040Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T02:46:43Z |
| Obs used |
281 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
15.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2025-04-23T10:52:57.561600Z |
| Discovery magnitude (MPC) |
20.32 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-10-06.0000000 |
| e |
0.47091682 |
| q (au) |
4.259801 |
| a (au) |
8.051288 |
| i (deg) |
11.386402 |
| Ω (om, deg) |
264.572232 |
| ω (w, deg) |
37.192514 |
| M (ma, deg) |
236.569669 |
밝기
산란 + 전체 선형
$$
M_a = (10.043 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.043 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.725 |
| k |
0.800 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2024-07-01 |
2025-08-05 |
+24.7671 |
-15.558 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
22:27:54.26 |
-00:04:47.4 |
HIP 110960 |
14.34 |
| 2026-03-26 12:00 |
22:28:23.60 |
-00:01:15.0 |
HIP 110960 |
6.55 |
| 2026-03-27 00:00 |
22:28:52.87 |
+00:02:17.5 |
HIP 110960 |
3.58 |
| 2026-03-27 12:00 |
22:29:22.08 |
+00:05:50.1 |
HIP 110960 |
10.71 |
| 2026-03-28 00:00 |
22:29:51.23 |
+00:09:22.7 |
HIP 111079 |
4.80 |
| 2026-03-28 12:00 |
22:30:20.30 |
+00:12:55.4 |
HIP 111079 |
5.30 |
| 2026-03-29 00:00 |
22:30:49.32 |
+00:16:28.1 |
HIP 111079 |
12.79 |
| 2026-03-29 12:00 |
22:31:18.26 |
+00:20:00.9 |
HIP 111079 |
20.72 |
| 2026-03-30 00:00 |
22:31:47.14 |
+00:23:33.7 |
HIP 111336 |
25.09 |
| 2026-03-30 12:00 |
22:32:15.96 |
+00:27:06.6 |
HIP 111336 |
20.02 |
| 2026-03-31 00:00 |
22:32:44.70 |
+00:30:39.5 |
HIP 111336 |
17.36 |
| 2026-03-31 12:00 |
22:33:13.38 |
+00:34:12.4 |
HIP 111336 |
18.18 |
| 2026-04-01 00:00 |
22:33:41.99 |
+00:37:45.4 |
HIP 111441 |
13.64 |
| 2026-04-01 12:00 |
22:34:10.54 |
+00:41:18.5 |
HIP 111441 |
8.46 |
| 2026-04-02 00:00 |
22:34:39.01 |
+00:44:51.5 |
HIP 111441 |
9.17 |
| 2026-04-02 12:00 |
22:35:07.41 |
+00:48:24.6 |
HIP 111441 |
14.93 |
| 2026-04-03 00:00 |
22:35:35.75 |
+00:51:57.6 |
HIP 111441 |
22.07 |
| 2026-04-03 12:00 |
22:36:04.01 |
+00:55:30.7 |
HIP 111441 |
29.60 |
| 2026-04-04 00:00 |
22:36:32.20 |
+00:59:03.8 |
HIP 111613 |
37.27 |
| 2026-04-04 12:00 |
22:37:00.32 |
+01:02:36.9 |
HIP 111719 |
31.76 |
| 2026-04-05 00:00 |
22:37:28.37 |
+01:06:10.0 |
HIP 111719 |
26.36 |
| 2026-04-05 12:00 |
22:37:56.35 |
+01:09:43.1 |
HIP 111719 |
22.46 |
| 2026-04-06 00:00 |
22:38:24.25 |
+01:13:16.2 |
HIP 111719 |
20.89 |
| 2026-04-06 12:00 |
22:38:52.08 |
+01:16:49.3 |
HIP 111900 |
17.63 |
| 2026-04-07 00:00 |
22:39:19.84 |
+01:20:22.3 |
HIP 111900 |
12.82 |
| 2026-04-07 12:00 |
22:39:47.52 |
+01:23:55.3 |
HIP 111900 |
11.82 |
| 2026-04-08 00:00 |
22:40:15.13 |
+01:27:28.3 |
HIP 111900 |
15.36 |
| 2026-04-08 12:00 |
22:40:42.66 |
+01:31:01.3 |
HIP 111952 |
16.69 |
| 2026-04-09 00:00 |
22:41:10.11 |
+01:34:34.2 |
HIP 111952 |
15.31 |
| 2026-04-09 12:00 |
22:41:37.49 |
+01:38:07.1 |
HIP 111952 |
17.57 |
| 2026-04-10 00:00 |
22:42:04.79 |
+01:41:39.9 |
HIP 111952 |
22.39 |
| 2026-04-10 12:00 |
22:42:32.01 |
+01:45:12.7 |
HIP 112202 |
24.59 |
| 2026-04-11 00:00 |
22:42:59.16 |
+01:48:45.4 |
HIP 112202 |
18.13 |
| 2026-04-11 12:00 |
22:43:26.22 |
+01:52:18.0 |
HIP 112202 |
13.04 |
| 2026-04-12 00:00 |
22:43:53.21 |
+01:55:50.6 |
HIP 112202 |
11.29 |
| 2026-04-12 12:00 |
22:44:20.11 |
+01:59:23.1 |
HIP 112202 |
14.16 |
| 2026-04-13 00:00 |
22:44:46.93 |
+02:02:55.6 |
HIP 112202 |
19.70 |
| 2026-04-13 12:00 |
22:45:13.67 |
+02:06:27.9 |
HIP 112350 |
21.43 |
| 2026-04-14 00:00 |
22:45:40.33 |
+02:10:00.1 |
HIP 112350 |
25.22 |
| 2026-04-14 12:00 |
22:46:06.91 |
+02:13:32.3 |
HIP 112522 |
21.67 |
| 2026-04-15 00:00 |
22:46:33.40 |
+02:17:04.3 |
HIP 112522 |
14.40 |
| 2026-04-15 12:00 |
22:46:59.81 |
+02:20:36.3 |
HIP 112522 |
7.62 |
| 2026-04-16 00:00 |
22:47:26.13 |
+02:24:08.1 |
HIP 112522 |
4.57 |