메타데이터
| 항목 |
값 |
| Designation |
490P/ATLAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-06-22T16:00:54.581760Z |
| Orbit solution date (soln_date, UTC) |
2024-12-03T17:12:47Z |
| Obs used |
368 |
| NEO |
Yes |
| M1 |
20.500 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-06-29T13:56:52.051200Z |
| Discovery magnitude (MPC) |
18.36 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-12-01.0000000 |
| e |
0.64849913 |
| q (au) |
1.063456 |
| a (au) |
3.025473 |
| i (deg) |
12.281885 |
| Ω (om, deg) |
307.601988 |
| ω (w, deg) |
332.525414 |
| M (ma, deg) |
30.215976 |
밝기
산란 + 전체 선형
$$
M_a = (19.669 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
19.669 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.735 |
| k |
0.975 |
| 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) |
| 2026-03-26 00:00 |
04:03:39.15 |
+29:41:12.0 |
HIP 18965 |
29.43 |
| 2026-03-26 12:00 |
04:04:03.80 |
+29:41:14.1 |
HIP 18965 |
29.49 |
| 2026-03-27 00:00 |
04:04:28.57 |
+29:41:16.7 |
HIP 18965 |
30.53 |
| 2026-03-27 12:00 |
04:04:53.44 |
+29:41:19.7 |
HIP 18965 |
32.46 |
| 2026-03-28 00:00 |
04:05:18.43 |
+29:41:23.2 |
HIP 18965 |
35.15 |
| 2026-03-28 12:00 |
04:05:43.53 |
+29:41:27.2 |
HIP 19197 |
37.98 |
| 2026-03-29 00:00 |
04:06:08.74 |
+29:41:31.6 |
HIP 19197 |
36.12 |
| 2026-03-29 12:00 |
04:06:34.06 |
+29:41:36.5 |
HIP 19197 |
35.02 |
| 2026-03-30 00:00 |
04:06:59.48 |
+29:41:41.8 |
HIP 19197 |
34.74 |
| 2026-03-30 12:00 |
04:07:25.01 |
+29:41:47.6 |
HIP 19197 |
35.33 |
| 2026-03-31 00:00 |
04:07:50.64 |
+29:41:53.8 |
HIP 19365 |
33.46 |
| 2026-03-31 12:00 |
04:08:16.38 |
+29:42:00.4 |
HIP 19365 |
31.66 |
| 2026-04-01 00:00 |
04:08:42.22 |
+29:42:07.4 |
HIP 19365 |
30.79 |
| 2026-04-01 12:00 |
04:09:08.16 |
+29:42:14.8 |
HIP 19365 |
30.95 |
| 2026-04-02 00:00 |
04:09:34.20 |
+29:42:22.6 |
HIP 19572 |
27.87 |
| 2026-04-02 12:00 |
04:10:00.34 |
+29:42:30.8 |
HIP 19572 |
22.41 |
| 2026-04-03 00:00 |
04:10:26.58 |
+29:42:39.4 |
HIP 19572 |
17.07 |
| 2026-04-03 12:00 |
04:10:52.91 |
+29:42:48.4 |
HIP 19572 |
12.04 |
| 2026-04-04 00:00 |
04:11:19.34 |
+29:42:57.7 |
HIP 19572 |
7.97 |
| 2026-04-04 12:00 |
04:11:45.87 |
+29:43:07.4 |
HIP 19572 |
6.92 |
| 2026-04-05 00:00 |
04:12:12.49 |
+29:43:17.5 |
HIP 19572 |
9.94 |
| 2026-04-05 12:00 |
04:12:39.21 |
+29:43:27.9 |
HIP 19572 |
14.73 |
| 2026-04-06 00:00 |
04:13:06.01 |
+29:43:38.6 |
HIP 19572 |
20.08 |
| 2026-04-06 12:00 |
04:13:32.91 |
+29:43:49.7 |
HIP 19835 |
23.51 |
| 2026-04-07 00:00 |
04:13:59.90 |
+29:44:01.1 |
HIP 19835 |
18.32 |
| 2026-04-07 12:00 |
04:14:26.98 |
+29:44:12.9 |
HIP 19835 |
13.67 |
| 2026-04-08 00:00 |
04:14:54.15 |
+29:44:25.0 |
HIP 19835 |
10.34 |
| 2026-04-08 12:00 |
04:15:21.41 |
+29:44:37.3 |
HIP 19835 |
9.83 |
| 2026-04-09 00:00 |
04:15:48.75 |
+29:44:50.0 |
HIP 19835 |
12.50 |
| 2026-04-09 12:00 |
04:16:16.18 |
+29:45:03.0 |
HIP 19835 |
16.94 |
| 2026-04-10 00:00 |
04:16:43.70 |
+29:45:16.3 |
HIP 19895 |
19.14 |
| 2026-04-10 12:00 |
04:17:11.30 |
+29:45:29.9 |
HIP 20076 |
14.51 |
| 2026-04-11 00:00 |
04:17:38.98 |
+29:45:43.7 |
HIP 20076 |
8.64 |
| 2026-04-11 12:00 |
04:18:06.75 |
+29:45:57.8 |
HIP 20076 |
3.29 |
| 2026-04-12 00:00 |
04:18:34.59 |
+29:46:12.2 |
HIP 20076 |
4.45 |
| 2026-04-12 12:00 |
04:19:02.52 |
+29:46:26.9 |
HIP 20076 |
10.12 |
| 2026-04-13 00:00 |
04:19:30.53 |
+29:46:41.8 |
HIP 20076 |
16.09 |
| 2026-04-13 12:00 |
04:19:58.62 |
+29:46:57.0 |
HIP 20076 |
22.14 |
| 2026-04-14 00:00 |
04:20:26.78 |
+29:47:12.4 |
HIP 20386 |
20.97 |
| 2026-04-14 12:00 |
04:20:55.03 |
+29:47:28.0 |
HIP 20386 |
15.65 |
| 2026-04-15 00:00 |
04:21:23.35 |
+29:47:43.9 |
HIP 20386 |
11.19 |
| 2026-04-15 12:00 |
04:21:51.74 |
+29:48:00.0 |
HIP 20386 |
9.02 |
| 2026-04-16 00:00 |
04:22:20.21 |
+29:48:16.3 |
HIP 20386 |
10.67 |