메타데이터
| 항목 |
값 |
| Designation |
C/2019 T4 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-06-08T23:44:31.977600Z |
| Orbit solution date (soln_date, UTC) |
2025-09-30T13:39:20Z |
| Obs used |
5476 |
| NEO |
- |
| M1 |
4.400 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-10-09T13:58:04.368000Z |
| Discovery magnitude (MPC) |
19.39 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2023-02-14.0000000 |
| e |
0.99562110 |
| q (au) |
4.242148 |
| a (au) |
968.770059 |
| i (deg) |
53.632165 |
| Ω (om, deg) |
199.939253 |
| ω (w, deg) |
351.177452 |
| M (ma, deg) |
0.008172 |
밝기
산란 + 전체 선형
$$
M_a = (3.119 + 4.200\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
3.119 |
| n |
4.200 |
| gf |
0.989 |
| gb |
-0.743 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2019-02-05 |
2021-02-02 |
+6.6977 |
-5.781 |
| 2021-02-02 |
2022-06-06 |
-0.8622 |
+0.131 |
| 2022-06-11 |
2025-10-20 |
+0.0696 |
-0.299 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
19:41:23.99 |
+34:21:10.7 |
HIP 96833 |
6.48 |
| 2026-05-12 12:00 |
19:41:21.27 |
+34:23:00.7 |
HIP 96833 |
5.50 |
| 2026-05-13 00:00 |
19:41:18.45 |
+34:24:50.1 |
HIP 96833 |
5.06 |
| 2026-05-13 12:00 |
19:41:15.53 |
+34:26:38.9 |
HIP 96833 |
5.30 |
| 2026-05-14 00:00 |
19:41:12.52 |
+34:28:27.1 |
HIP 96833 |
6.13 |
| 2026-05-14 12:00 |
19:41:09.40 |
+34:30:14.6 |
HIP 96833 |
7.36 |
| 2026-05-15 00:00 |
19:41:06.19 |
+34:32:01.5 |
HIP 96833 |
8.81 |
| 2026-05-15 12:00 |
19:41:02.88 |
+34:33:47.8 |
HIP 96833 |
10.40 |
| 2026-05-16 00:00 |
19:40:59.48 |
+34:35:33.4 |
HIP 96833 |
12.06 |
| 2026-05-16 12:00 |
19:40:55.98 |
+34:37:18.3 |
HIP 96833 |
13.77 |
| 2026-05-17 00:00 |
19:40:52.38 |
+34:39:02.5 |
HIP 96833 |
15.52 |
| 2026-05-17 12:00 |
19:40:48.69 |
+34:40:46.1 |
HIP 96833 |
17.28 |
| 2026-05-18 00:00 |
19:40:44.90 |
+34:42:28.9 |
HIP 96833 |
19.06 |
| 2026-05-18 12:00 |
19:40:41.02 |
+34:44:11.0 |
HIP 96833 |
20.84 |
| 2026-05-19 00:00 |
19:40:37.04 |
+34:45:52.5 |
HIP 96833 |
22.64 |
| 2026-05-19 12:00 |
19:40:32.98 |
+34:47:33.2 |
HIP 96759 |
21.98 |
| 2026-05-20 00:00 |
19:40:28.81 |
+34:49:13.1 |
HIP 96759 |
20.16 |
| 2026-05-20 12:00 |
19:40:24.56 |
+34:50:52.4 |
HIP 96759 |
18.36 |
| 2026-05-21 00:00 |
19:40:20.21 |
+34:52:30.8 |
HIP 96759 |
16.58 |
| 2026-05-21 12:00 |
19:40:15.78 |
+34:54:08.5 |
HIP 96759 |
14.84 |
| 2026-05-22 00:00 |
19:40:11.25 |
+34:55:45.5 |
HIP 96759 |
13.14 |
| 2026-05-22 12:00 |
19:40:06.63 |
+34:57:21.7 |
HIP 96759 |
11.51 |
| 2026-05-23 00:00 |
19:40:01.93 |
+34:58:57.1 |
HIP 96759 |
9.97 |
| 2026-05-23 12:00 |
19:39:57.13 |
+35:00:31.7 |
HIP 96759 |
8.58 |
| 2026-05-24 00:00 |
19:39:52.25 |
+35:02:05.5 |
HIP 96759 |
7.41 |
| 2026-05-24 12:00 |
19:39:47.27 |
+35:03:38.5 |
HIP 96759 |
6.59 |
| 2026-05-25 00:00 |
19:39:42.22 |
+35:05:10.7 |
HIP 96759 |
6.25 |
| 2026-05-25 12:00 |
19:39:37.07 |
+35:06:42.1 |
HIP 96759 |
6.47 |
| 2026-05-26 00:00 |
19:39:31.84 |
+35:08:12.6 |
HIP 96759 |
7.20 |
| 2026-05-26 12:00 |
19:39:26.52 |
+35:09:42.3 |
HIP 96759 |
8.29 |
| 2026-05-27 00:00 |
19:39:21.12 |
+35:11:11.2 |
HIP 96759 |
9.64 |
| 2026-05-27 12:00 |
19:39:15.63 |
+35:12:39.3 |
HIP 96759 |
11.14 |
| 2026-05-28 00:00 |
19:39:10.07 |
+35:14:06.5 |
HIP 96759 |
12.74 |
| 2026-05-28 12:00 |
19:39:04.41 |
+35:15:32.8 |
HIP 96579 |
12.85 |
| 2026-05-29 00:00 |
19:38:58.68 |
+35:16:58.2 |
HIP 96579 |
11.76 |
| 2026-05-29 12:00 |
19:38:52.86 |
+35:18:22.8 |
HIP 96579 |
10.87 |
| 2026-05-30 00:00 |
19:38:46.96 |
+35:19:46.5 |
HIP 96579 |
10.20 |
| 2026-05-30 12:00 |
19:38:40.99 |
+35:21:09.3 |
HIP 96579 |
9.82 |
| 2026-05-31 00:00 |
19:38:34.93 |
+35:22:31.3 |
HIP 96579 |
9.76 |
| 2026-05-31 12:00 |
19:38:28.79 |
+35:23:52.3 |
HIP 96579 |
10.02 |
| 2026-06-01 00:00 |
19:38:22.57 |
+35:25:12.4 |
HIP 96579 |
10.58 |
| 2026-06-01 12:00 |
19:38:16.28 |
+35:26:31.6 |
HIP 96579 |
11.39 |
| 2026-06-02 00:00 |
19:38:09.91 |
+35:27:49.9 |
HIP 96579 |
12.41 |