메타데이터
| 항목 |
값 |
| Designation |
P/2021 Q5 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-08-30T10:00:46.546560Z |
| Orbit solution date (soln_date, UTC) |
2025-01-14T17:42:18Z |
| Obs used |
274 |
| NEO |
Yes |
| M1 |
15.800 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-08-29T14:33:45.619200Z |
| Discovery magnitude (MPC) |
17.59 o |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-09-20.0000000 |
| e |
0.62395172 |
| q (au) |
1.234397 |
| a (au) |
3.282550 |
| i (deg) |
10.733839 |
| Ω (om, deg) |
239.770616 |
| ω (w, deg) |
180.879852 |
| M (ma, deg) |
3.411076 |
밝기
산란 + 전체 선형
$$
M_a = (14.774 + 2.320\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.774 |
| n |
2.320 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
19:16:39.25 |
-13:23:12.8 |
HIP 94731 |
33.20 |
| 2026-06-01 12:00 |
19:16:24.05 |
-13:22:16.0 |
HIP 94731 |
32.30 |
| 2026-06-02 00:00 |
19:16:08.58 |
-13:21:19.8 |
HIP 94731 |
31.85 |
| 2026-06-02 12:00 |
19:15:52.85 |
-13:20:24.2 |
HIP 94731 |
31.90 |
| 2026-06-03 00:00 |
19:15:36.86 |
-13:19:29.2 |
HIP 94731 |
32.48 |
| 2026-06-03 12:00 |
19:15:20.61 |
-13:18:35.0 |
HIP 94559 |
32.13 |
| 2026-06-04 00:00 |
19:15:04.10 |
-13:17:41.3 |
HIP 94559 |
30.25 |
| 2026-06-04 12:00 |
19:14:47.32 |
-13:16:48.3 |
HIP 94559 |
28.84 |
| 2026-06-05 00:00 |
19:14:30.29 |
-13:15:56.0 |
HIP 94559 |
28.01 |
| 2026-06-05 12:00 |
19:14:13.01 |
-13:15:04.4 |
HIP 94559 |
27.84 |
| 2026-06-06 00:00 |
19:13:55.47 |
-13:14:13.4 |
HIP 94559 |
28.35 |
| 2026-06-06 12:00 |
19:13:37.67 |
-13:13:23.1 |
HIP 94559 |
29.55 |
| 2026-06-07 00:00 |
19:13:19.63 |
-13:12:33.5 |
HIP 94559 |
31.38 |
| 2026-06-07 12:00 |
19:13:01.33 |
-13:11:44.6 |
HIP 94559 |
33.76 |
| 2026-06-08 00:00 |
19:12:42.79 |
-13:10:56.3 |
HIP 94407 |
36.05 |
| 2026-06-08 12:00 |
19:12:24.00 |
-13:10:08.8 |
HIP 94407 |
35.88 |
| 2026-06-09 00:00 |
19:12:04.96 |
-13:09:21.9 |
HIP 94407 |
36.33 |
| 2026-06-09 12:00 |
19:11:45.68 |
-13:08:35.8 |
HIP 94407 |
37.41 |
| 2026-06-10 00:00 |
19:11:26.17 |
-13:07:50.3 |
HIP 94107 |
35.52 |
| 2026-06-10 12:00 |
19:11:06.41 |
-13:07:05.6 |
HIP 94107 |
32.09 |
| 2026-06-11 00:00 |
19:10:46.42 |
-13:06:21.6 |
HIP 94107 |
29.01 |
| 2026-06-11 12:00 |
19:10:26.19 |
-13:05:38.3 |
HIP 94107 |
26.46 |
| 2026-06-12 00:00 |
19:10:05.74 |
-13:04:55.7 |
HIP 94107 |
24.63 |
| 2026-06-12 12:00 |
19:09:45.05 |
-13:04:13.9 |
HIP 94014 |
20.39 |
| 2026-06-13 00:00 |
19:09:24.14 |
-13:03:32.8 |
HIP 94014 |
15.40 |
| 2026-06-13 12:00 |
19:09:03.00 |
-13:02:52.4 |
HIP 94014 |
10.52 |
| 2026-06-14 00:00 |
19:08:41.65 |
-13:02:12.8 |
HIP 94014 |
6.13 |
| 2026-06-14 12:00 |
19:08:20.07 |
-13:01:33.9 |
HIP 94014 |
4.46 |
| 2026-06-15 00:00 |
19:07:58.28 |
-13:00:55.7 |
HIP 93947 |
3.76 |
| 2026-06-15 12:00 |
19:07:36.29 |
-13:00:18.3 |
HIP 93947 |
2.67 |
| 2026-06-16 00:00 |
19:07:14.08 |
-12:59:41.6 |
HIP 93947 |
7.68 |
| 2026-06-16 12:00 |
19:06:51.67 |
-12:59:05.7 |
HIP 93947 |
13.09 |
| 2026-06-17 00:00 |
19:06:29.05 |
-12:58:30.5 |
HIP 93947 |
18.59 |
| 2026-06-17 12:00 |
19:06:06.24 |
-12:57:56.0 |
HIP 93947 |
24.16 |
| 2026-06-18 00:00 |
19:05:43.24 |
-12:57:22.4 |
HIP 93947 |
29.77 |
| 2026-06-18 12:00 |
19:05:20.04 |
-12:56:49.4 |
HIP 93560 |
32.08 |
| 2026-06-19 00:00 |
19:04:56.66 |
-12:56:17.2 |
HIP 93560 |
26.82 |
| 2026-06-19 12:00 |
19:04:33.10 |
-12:55:45.8 |
HIP 93560 |
21.75 |
| 2026-06-20 00:00 |
19:04:09.35 |
-12:55:15.1 |
HIP 93560 |
17.13 |
| 2026-06-20 12:00 |
19:03:45.43 |
-12:54:45.2 |
HIP 93560 |
13.44 |
| 2026-06-21 00:00 |
19:03:21.34 |
-12:54:16.0 |
HIP 93560 |
11.70 |
| 2026-06-21 12:00 |
19:02:57.08 |
-12:53:47.6 |
HIP 93560 |
12.78 |
| 2026-06-22 00:00 |
19:02:32.65 |
-12:53:19.9 |
HIP 93560 |
16.16 |